Cody'sLab i'd love to See this in action. Maybe because of the high density of mercury you wouldn't even have to use pump? Just a reservoir placed at a high elevation, we both know u have more than enough quicksilver to do it. Give me a shout in your vid if u decide to do it :D
Gummy Bugz Not sure, it's entirely likely he found it on his own. If not I wish I had thought to post the link to the self acting version that I posted in his video's comments.
Maybe i'll concentrate hydrogen peroxide or sulfuric acid with this system. Anyway, I'm still remaking all the chemicals for the pyrimethamine synthesis so that's taking awhile. i'm not sure when the next video for that will be up. Next immediate video might be something on matches, we'll see. On a different note, good luck to all you students who will be returning to school/college/university soon.
do you edit you're voice and why. you don't have to answer that I was just wondering. by the way you're channel is great keep up the great work! love your vids.
Thank you NurdRage. I will be starting college on September 3rd. I'm going to major in, you guessed it, chemistry, your videos are what originally sparked my interest in the subject.
Well i finally got around to testing this. I used pretty much exactly the same setup- the same cheap aspirator, the exact same water pump, some tubing and a square mop bucket as the reservoir. The results were pleasing. i was able to distill acetone at 18c. the flask was so cool it was even water condensate on the outside of it. my lab was a rather warm 29.8C in contrast. the reservoir water temp was not ice cold so it probably would be able to distill at a lower temperature still. The only thing i found was a need to have the aspirator positioned vertical unlike what you have here and the vacuum was quite strong too when i tested it for a vacuum filtration as well. Thankyou for showing this setup! i had my doubts but it really does work as well as you have demonstrated here and i see how useful this little device really is.
Hello! Did you use an aspirator like the one he shows here? Or did you use a lab grade aspirator? I am attempting this set up with a lab grade aspirator (also called a filter pump; a bit longer and all metal) and have not been able to pull a vacuum strong enough to boil my water solution.
Very helpful. I always wanted to know a cheap and effective vacuum system. I had always used an aspirator from a pet store used for cleaning fish tanks but, that was a huge cost of water. Not to mention the effects on the environment. This is a perfect set-up that I wouldnt mind being abusive to since the components are so cheap. secondly I wasnt aware that you could lower the boiling point that low. My aspirator must suck because I could only get it down 15-20 degrees. This is hugely useful for not only simple things like filtration but also distilling those pesky high boiling point compounds that like to decompose at high temps. Thanks Nurdrage and keep up the good work.
Not sure where to put this comment but I need help. I rigged up a pump a little bigger than his with an identical appearing venturi and could only get down to -6 in Hg. Does this video ever come out and say what he got?
After a couple of tries, I got a 14 mm x 1.0 mm pitch die that perfectly fits the inlet an aspirator that appears identical. While waiting on it, I had an experience where another aspirator would do -7" Hg with < 6 mm separation from my fitting on the pump and -28" Hg with an 18" tube. Theory is that aspirators require laminar flow input and 50 pipe diameters are required to re-establish laminar flow after passing through a pump or past a 90 degree elbow. But, enough power and it does not much matter but at the edges, it can.
on ships this is called "ejector", used for distillation of sea water, to obtain fresh water with minimal use of heat (in fact the waste heat from the engine is used), wonderful Venturi effect
I've used venturi vacuum generators like this all my life for vacuum bagging composites to degassing solid propellants, vacuum molding, etc. Vacuum Forming tip; use a portable air tank for inflating tires to act as a vacuum surge tank for the initial surge to pull the vacuform material into the mold then the venturi will pull it the rest of the way into the mold. Works amazingly well for doing polycarbonate and PVC molding in the garage. :-)
yeah, it's so simple yet so effective. Since a machine shop almost always has a source of compressed air, the venturi pump is an extremely cost effective moderate vacuum system.
Indeed. Actually, the venturi generators that McMaster Carr sells generate huge amounts of vacuum (thought with air as the medium). During some destructive failure mode testing I did back in 2007. I was able to collapse a stainless steel case made of 3mm material measuring 400mmWx500mmHx1000mmL with one of those generators. Blew my mind.
Did you actually measure the vacuum pressure? Because even moderate pressure can bend steel. What's doing the work is the surface area of the steel since pressure is a "per unit area" effect. Ultra high vacuum and moderate vacuum actually has very little difference in terms of mechanical effects since the force applied per unit area isn't very different. But ultra high vacuum is necessary for physics work because it's the molecules themselves that are affecting the results rather the physical forces they are applying. Hooking up a particle physics grade ion pump and a water based aspirator pump to a vacuum forming machine would show little if any noticeable difference. But hook those up to a mass spectrometer and the spectrometer would likely arc and destroy itself on the aspirator pump.
I remember having these vacuum pumps made as glassware as I was a kid. Couldn't use them for vacuum pumping those days, though, because of a lack of a high pressure water source. But they made great toys for the bath. I imagined them to be submarines.
thank you very much NurdRage, i'm building a diy fume hood and the vacuum line was a big deal, i have a 1 stage vacuum pump (for changing refrigerant in refrigerators) but water vapour is a big no for this kind of pumps ( acids and solvents are even bigger nope). many amateur chemists use the venturi pump, but as you said, using it from the tap is really a waste of water, but this setup really saved me :D
what you made is a scrubber. In the plant i work at it works using the same principle. It uses a venturi and caustic solution that pumps through the venturi. It generates just enough vacumm for all the reactor vents in the plant to allow gases to route to the scrubber.
It can certainly be used for scrubbing. It's a very old technology and i think even the greeks had it thousands of years ago. In this context it's an aspirator vacuum pump.
Good day. Vacuum pump aspirations (ie hopes and dreams) have, so far, lead to failure and its keeping me from getting started on any project! To keep things straightforward, could any and all readers suggest precise Brand, Make, Model info OR specific operational statistics (specs) that they currently are using (and functions well)? Frustration levels are hitting the ceiling! And bank balances the basement!
I've done this sort of thing before with a similar setup. It never occurred to me though, to use ice water. It makes a lot of sense now that I'm thinking about it. Thanks for the tip...
what kind of connector (with size etc) did you use to connect to pump and the aspirator, because i cant seem to find one. can someone help me i bought the aspirator and pump from aliexpress but cant find a connector
Thank you very much I did not know this method and it was very good for me to concentrate sulfuric acid since I do not have an airtight container that can be heated greetings from Argentina
The reason those 12v diaphragm pumps seem amazing is a brush type 10,000 rpm universal motor. It will shoot flames and billow smoke when the commuter wear gets bad. They will still run doing that though! I got about 10-20 hours before mine went. I tried powering one with a 3,000 rpm ac motor but that speed wasn't enough to do anything. Another possibility if you hate universal motors like me is an ac centrifugal sump pump. They don't have the pressure of positive displacement but you can daisy chain them, the outlet of the first plumbed to the inlet of the 2nd, etc.. The first stage nearly doubles pressure and you can add multiple pumps.
@nurdrage dumb question, but is it ok to heat the system to increase the vapour pressure in order to push the stuck water through? Also you said nothing about how to control the vaccum within this system. Turning the vaccum off? Bleeding the system? I would appreciate any help/response.
Que grande eres !!!!! I don´t know how to translate this but it feels so good watching this video....( and the one you made before it, and the one you made after, and the following......and the videos of the last year......... Thank you very much!!!!!!!!
This is a great tool for the home chemist. Ultimately a refrigeration vac pump is best, they can pull to 500 microns as is standard for system evacuation, they are also acid resistant since refrigerants tend to produce acids.
Please sir, what Hp (horsepower) refrigeration vacuum pump are you recommending here and how are they compared to A/C vac pump in-terms of power & chemical resistance?
Hobbyist here, how well do erlenmeyers withstand a vacuum? I've always read that they shouldn't be used in vacuum setups because they easily implode. Have you ever experienced this? Do you think my cheap Chinese eBay ones would be safe to use? Thank you
+Nurdrage This is (according to auctions I have found) available in aluminum, copper, and stainless steel, all for around $10. My knee-jerk reaction is to get stainless, but I've learned watching your videos that metals don't always behave like I expect, so I wonder which is really the best choice. I also wonder if there is any benefit to getting all three and using different metals depending on what it will be used for, or if it would just be better to get three of the same kind (which ever that would be) so I have replacements when they corrode.
this vid' is exactly what i needed. esp' the part about using a tub & pump to re-circulate the water. my need is to reduce the amount of water in an acidic plant extraction. as well as other distillations of solvents to recover the extra solvent beyond what was needed to dissolve the cd's of interest. i've known of you for several years now. and held off being a patron for a lack of see you using a spectrophotometer to monitor an experiments progress. as well as to show us how one can be used to determine distribution-coefficients of liq-liq extractions. and now , never mind all that, you deserve my support anyway. the next step ... reach for my wallet
You can use this for vacuum desiccation as well? Also, you mention this can break azeotropes. I was hoping to distill 72% perchloric acid without creating the anhydrous acid considering that the anhydrous acid comes over yellow from dissolved chlorine dioxide and I prefer to not do that..
Maybe you should construct your outlet so that water can go out straightly and not through whole tubing, as going through the tubes requires additional effort so it may reduce your vacuum
Very nice work. I always used a refridgerator compressor as cheap vacuum pump in the past, I had one that could go down to 30 mmHg and that baby took solvent and corrosive vapours for years before it finally broke down. A fan on it was sufficient cooling so it could run relatively stable for 12 hours. It was free from a junkyard. I must admit that I've had others too that were not nearly that quality. You can also put two in series for a higher vacuum (or in parallel if you need a high flow rate, as they don't perform well there). I didn't use aspirators because of the waste of tap water, but I have to say your system is quite nifty, I like it very much. EDIT: I just tested an old fridge compressor in my garage and it measured +- 60 mmHg. I guess I was lucky with my late baby child (may she rest in peace) and there is considerable variation in vacuum strength in refridgeration compressors. This one came from a cheap fridge, maybe the ones from combo fridge/freezers or those big ass American fridges or store-type deep freezers are the ones to look out for here.
Seems a reasonably good setup for my vacuum distillation of essential oils,. Also to distill out alcohol from tinctures without rising too much the temperature and destroing essential oils.
Idd a great and relatively cheap tool to achieve vacuum. Good that you explain not to connect it to your faucet and thereby spill loads of water while polluting it. We used them in our lab till around the mid 90's, then they got banned. Now its all membrane pumps, good ones are pricey though.
That's awesome. So if a 100psi pump can make 30mbar or 56mmHg, I wonder how well a fishtank pump will do? I am happy with enough vacuum to stop acid vapours from escaping.
Hi! You have taught me a lot through your videos NurdRage. Thanks a lot! The pump you're using, does it withstand continuous work during all the distillation run? Or does it need to be stopped periodically to cool or prevent wear on the diaphragm? I suppose using ice water helps it to run cooler but, does it need break intervals? Thank you and have a nice day!
I think so too, unless the low pressure causes all the water in the stream to instantly flash boil I think it would help. But it would probably take a much more expensive pump to get the same results as some ice.
It wouldn't help to get a lower pressure. With a more powerful pump you can evacuate faster, but not to a lower pressure. In short: As he stated, the water in the aspirator begins to boil, so no more air can get sucked in. That's the point where the end vacuum is reached with the pressure equals the vapor pressure of the liquid.
+I AM Diablo Nope, if you listen again at 4:55 i say "what limits the ultimate vacuum in this case isn't the design of the system but the working fluid." A greater pump will NOT avoid this problem. You could put the entire hoover dam behind you, and you'll never get below the vapor pressure of the working fluid.
Very neat (and cheap) solution, I didn't thought such a little water pump could handle a aspirator. To the cheap china rotary pumps: Yes they corrode extremely easily, but for the price of 50 bucks they are quite OK. Used one for many years, even Trichloracetic acid got in it an one point and the corrosion stopped the pump. After a little cleaning the pump was running again... (of course vacuum was not as good as stated, but for chemistry use it was OK with about 1-5mbar even after abusing )
yes same I am not seeing mention of this detail in the video - am I missing it, @NurdRage? it looks like you have some brass adapter connected on the outflow of the water pump - what is this?
Vacuum pump oil is pretty cheap by the gallon if purchased at stores selling farm products. They sell in 1 gal increments. Not great for high vacuum purposes, but if you need to change the oil frequently like me due to contamination, it is great.
Nifty. Seen such setups before. Some that had their aspirators made from HD PP? Something like that. I think that you are right about buying the parts online, Amazon and eBay? Thanks for the demo.
Does the boiling points of other liquids change proportional to water or does other params like molar mass, density play a role? For e.g. at usual air pressure, water 100°C and ethanol 78°C. At vaccum 70mbar water 39°C and ethanol at 30°C (percentage) or 17°C (linear)?
Would you have to worry about rupturing glassware with this setup? Or will it not reach that extreme of a vacuum? 19°C is over 29 inHg, for a 50$ setup that is ridiculously good!
+NurdRage I guess in theory the vacuum shouldn't be turned on until you close the fume hood. But if you're working with chemicals, safety goggles are a given anyways XD
If you can get you hands on some thrown out fridges or air conditioners, you could use the compressor as a vacuum pump, a number of people have had success with them. Of course they are oil filled, and corrosive chemicals destroy them, but if you use a dessicant or appropriate adsorbent traps(activated charcoal is reasonable for organics, molecular sieves for water) they can last for a while. And often you can get compressors for free, if you salvage them from non-functional units.
How are you supposed to safely remove the vacuum once done and let the air back in slowly? Also, when you turn off the pump, is it possible for the water to rush into the receiving flask?
So. A question. If you aren't after vacuum distilling anything special, more like drying stuff out or making distilled water or lifting potable water out of seawater, can you dispense with the water jacket, or is it still needed?
5:33 so if you had the 2 tubes for the input and output of the pump connected to a sealed bottle of mineral oil, befor then filling the lines up so there would be no air. then would that work instead of having to use a big tub?
No. Remember that the vacuum system is sucking air from your experiment into the output flow. So even if you start without any air in the water system, the vacuum system will inject some. For this same reason the liquid system can't be entirely closed and must be able to vent.
You could also direct the waterflow from the pump through your destiller first, in order to save some more water :) Also you could add icecubes to the mix to keep it very cold! EDIT: Oh, seams like you did exactly that :)
That must be some really tough tube on the vacuum side. 95 F requires a vac of almost -29 in Hg. All my ordinary vac tube collapses before -20 in Hg. Spring metal reinforced is the only one I know of that stays open. Love to try it with your rig but cannot get my venturis to go below -6 in Hg. Is there some critical tuning of jet release point?
Last week got a PB Auto tempered glass vacuum pot down to -27.3 in Hg in 30 minutes using a (submerged) Bel-Art aspirator and a KUNTEC 1/2HP Centrifugal Clear Clean Water Pump. Same aspirator does -28+ instantly with city water. Chapman / Humboldt H 12020 can do about the same.
OH, and boiled water at 131 F. Really weird, ran temp up to 145F before shutdown. AFTER pump off, vac held and temp drifted down with vac AND BOILING in tact till 131 F when boiling stopped.
If I use a rotary vane pump (12 CFM; max vac 2pa) with a cold trap, should my set-up work at 19 degrees like yours did? I didn't have any luck tinkering with my aspirator, so I figured I would move towards something more powerful.
@NurdRage After seeing this video I'm curious about experimenting with different fluids at cooled temperatures to see what works the best. Some dry ice will get acetone pretty cold, but would it be safe with that pump, or is there a special pump that would be needed to circulate acetone?
So, For the dedicated amateur I'm thinking incorp a tall minifrig setup for keeping the aspirator water cooled would be +1. Either have the aspriator pump and container all in the minifrig and run a vapor/gas release hose out the side of the frig (in case any volatile gases leeching into the aspirator need to escape from inside of the frig; or run the aspirator/container outside and basically make an DIY closed loop cooler with an aluminum radiator the container sits on, then run the intake line through your frig (almost like some extreme wort chiller setups, but with hosing and not copper piping ofc), so it is chilled before reaching the aspirator
Nice video. Do you know how much faster water will evaporate if: 1: You leave one jar of 10 cm of water in atmospheric pressure at 10 degrees centigrade 2: You leave one jar of 10 cm of water in vacuum with your setum (aspirator pump running water at 10 degrees centigrade) at 10 degrees centigrade?
I bought one after seeing this video years ago. Its never worked great. It sits in my random accessories bin years later. Ran across this video today. I might have to try it out again
+NurdRage why your old videos used to have an underlying title of professionalism but rather now they are DIY's and amatuerish ,and i don't mean any disregards i am a two year.old subscriber and i really appreciate your hard works Regards
I have been trying to freeze dry food I'm going to try one of these to get must of the water vapor and atmosphere out. Then switch to my standard rotary vane pump with a poor mans cold trap using ethanol and dry ice to get rid of what's left. The other option is to lightly add heat to the food. Will see what works I order one of these pumps
Thanks for the video, about 10yrears ago I was trying to concentrate H2O2 from 50% to around 80% with a home made aspirator pump. But at the time I was just using water from the tap so was limited in pressure. So I might have to try this again with your setup.
Glycol is super cheap, just get concentrated engine coolant. Heck you could also get the 50/50 mix of coolant and water and use a plastic baggie filled with dry ice as the glycol coolant will drop the freezing point by a very very good amount.
I've just find out your same ProPump on Ebay,as soon as I can manage to get a glass venturi pump I'll use your same setup;if I can manage to make the device a bit more smaller for save space I'll upload a demonstration :-)
Is it possible to do this type of vacuum distillation with a soxhlet extarctor? If so is there any spacial thing to be carful of or other things to keep in mind? (I understand that things under pressure could be more dangerous)
Better calcium chloride. Freezing point depression is a colligative property and does not depend on the species entering the solution, only on the number of particles. CaCl2 yields three particles versus two for NaCl. Note also that you can get a lower temperature if you use an additional agency of refrigeration rather than simply relying on the melting of the ice. The Fahrenheit zero is defined as the minimum temperature attainable by a well-mixed combination of well-comminuted ice and salt, but Wikipedia informs that "the minimum freezing point of a water-salt mixture is −21.12 °C (−6.02 °F) for 23.31 wt% of salt." By comparison, "Solutions of calcium chloride can prevent freezing at temperatures as low as −52 °C (−62 °F)" and "Dry ice and acetone forms a cold bath of −78 °C". [ibid]
We use that type of vacuum pump where I work, we fill gallon and half gallon bottles with milk and we get foam in the large stainless bowl so we use it to suck the foam off
Can someone help me troubleshoot my setup. I have a similar pump (80 psi and 4.5 L/min) and a different aspirator however it appears to be only pulling a weak vacuum. About 700 mmhg (absolute pressure).
Same thing here my dude. I bought the same pump and aspirator as nurdrage and Nill. So, I bought a slightly better diaphragm pump 70W 6lpm .9MPa still nothing. So, I bought a heavy duty aspirator, the kind you fit on a faucet. Couldn't pull s**t. Honestly I’m pretty peaved at nurdrage for posting this fallacious trash.
Either his pump is very different or vid is fake for views(chemists like to exaggerate yields and such for some wierd reason) You can get ~550-600 mmHg succ force from wall water supply tho Also make sure outgoing end of the aspirator is submerged at least at the begging
3:10 So what you're saying is that if I hook this up to my scientific glass bong, I can use it to take rips for me. Then I drink the water and get baked?
I had thought that to get close to or above 28inHg woume require a turbomolecular pump. Now you have me wondering if that ice-water method could be used for a vacuum chamber to do some metal plating of glass. Any physic geeks around to weigh in?
To be fair, a cold trap is easily set up. Most use a two stage design, one to cool going from ambient to a few below zero, while the next stage drops much farther. They are coupled by a heat exchanger. Normal compressors can be used, just gotta swap out the refrigerants. AppliedScience had a video on fixing his.
Really? I was under the impression it would be greater than a few hundred dollars. how much does it cost? I could never find anything cheaper. Could you give me a link to where i can buy one?
They normally are very expensive and hard to get. An easy and cheap way would be using a "dry ice maker" with a CO2-Cylinder, so you can always make a little bit of your own dry ice for the cold trap.
+Ethan M Oh i already know about that device. The thing is they cost several hundred to thousands of dollars. So really a cold trap isn't all that easy for the amateur. I thought you had a way of getting them for less than a couple of hundred when you said "To be fair, a cold trap is easily set up."
Hi Nurdrage, maybe if you remove the one way valve you can gain 20-30 torrs. Just make sure to disconnect the vacuum tube prior to disengage the pump. ciao
So will using the vacuum pump filtration distillation method like you demonstrated effect (in terms of contaminates) the distillate in any manner? I'm working with semi volatile organics and herbs.
+NurdRage vacuum pump distillation**. I'm using basic distillation through a flask into a biomass (GC reservoir) flask, and distilling though a still head, vacuum distillation adapter and condenser into a pressure equalizing separatory funnel. I just wanted to know if using a vacuum pump to draw air through the system would cause loss of product or any contamination since I'm distilling essential oils with a roughly similar boiling point to that of the water distillate (hydrosol). Thanks so much! Maybe I shouldn't use the vacuum adapter at all?
Hello again, I am wondering if you used anything other than vacuum grease to secure the joints of your glassware? I have been using Dow Corning, but am concerned that there may be some leaks in my setup.
@@NurdRage It is able to suck up water. So I don't think there's anything wrong with it. I just think that the vacuum it generates is for some reason not enough.
Thanks for the great video! I want to use this cheap vacuum set-up for ethanol, and it seems perfect for that, but I want to be able to distill at a temperature of my choosing (between say 35 - 50C with a rotary evaporator). So my question is: Can you vary the pump speed to give a certain vacuum, or do you always have to use the ultimate vacuum strength, (which is what you seem to do in the video)?
Could you recommend a solid method for making non-alcoholic beer? I've tried the heating process to no avail. I'm now looking into vacuum distillation and a semipermeable membrane to separate two fractions from alcoholic beer. Thanks!
Thank you for the video and for all of your help so far! I promise this is my last question for you. Is the barometric pressure where you live relatively low? Where I live, the pressure is at 30.24 in hg. I am thinking that this is why the set-up isn't working for me.
I actually almost got the exact same aspirator vacuum pump that you got (Yantra Lab I think?) Looks identical to the one from Deschem, except it's not stainless steel (which I can tell yours isn't from the texture). Apparently these ones get destroyed from any corrosive fumes relatively quickly (say for example - using it to vacuum filter or distill something with HCl). The one I purchased is nickel coated, which apparently is even better than stainless steel. But I plan on setting up a self contained system just like you demonstrated here. Great setup!
@31946mar I think just using really cold water at a fast rate... not sure what else to do that's practical and helpful. I eventually just found some amazing KNF diaphragm vacuum pumps on GovDeals. If you need a decent vacuum then I recommend you do the same.
Thanks: I wondered about the relationship between pump water temp and vacuum, but never looked into it. Cheers, Mark ************************************
Agh, I think one can consistantly say the higher psi pump would be better for vacuum filtration, esp. filtering through a medium such as diatomic earth. Just because it will have a higher flow rate! Answered that on. logic, but I am a medicinal biopsychopharmacologist! 😀
"I wonder how mercury would do if run through an aspirator pump" -- dangerous thought of the day
Assuming you could get it flowing fast enough, the low vapor pressure of mercury should make for a nice vacuum.
Cody'sLab i'd love to See this in action. Maybe because of the high density of mercury you wouldn't even have to use pump? Just a reservoir placed at a high elevation, we both know u have more than enough quicksilver to do it. Give me a shout in your vid if u decide to do it :D
I believe that is called a Sprengel pump
Gummy Bugz
Not sure, it's entirely likely he found it on his own. If not I wish I had thought to post the link to the self acting version that I posted in his video's comments.
that and the fact cody treat Hu like water
Maybe i'll concentrate hydrogen peroxide or sulfuric acid with this system. Anyway, I'm still remaking all the chemicals for the pyrimethamine synthesis so that's taking awhile. i'm not sure when the next video for that will be up. Next immediate video might be something on matches, we'll see.
On a different note, good luck to all you students who will be returning to school/college/university soon.
Thank you, Im Going back tomorrow, and sadly I was forced to quit chemistry so now everyone at school will be asking me about it...
Yes that would be amazing to see you concentrate hydrogen peroxide please really consider making that video... Thank you
Do you disguise your voice?
do you edit you're voice and why. you don't have to answer that I was just wondering. by the way you're channel is great keep up the great work! love your vids.
Thank you NurdRage. I will be starting college on September 3rd. I'm going to major in, you guessed it, chemistry, your videos are what originally sparked my interest in the subject.
Distilling water at 39°C with your set up is impressive ! Well done :)
It gets BETTER! :)
Oh god I just watched the rest of the video: 19°C??? This is crazy !
Well i finally got around to testing this. I used pretty much exactly the same setup- the same cheap aspirator, the exact same water pump, some tubing and a square mop bucket as the reservoir. The results were pleasing. i was able to distill acetone at 18c. the flask was so cool it was even water condensate on the outside of it. my lab was a rather warm 29.8C in contrast. the reservoir water temp was not ice cold so it probably would be able to distill at a lower temperature still.
The only thing i found was a need to have the aspirator positioned vertical unlike what you have here and the vacuum was quite strong too when i tested it for a vacuum filtration as well. Thankyou for showing this setup! i had my doubts but it really does work as well as you have demonstrated here and i see how useful this little device really is.
how long can this diaphragm water pump work ?
Hello! Did you use an aspirator like the one he shows here? Or did you use a lab grade aspirator? I am attempting this set up with a lab grade aspirator (also called a filter pump; a bit longer and all metal) and have not been able to pull a vacuum strong enough to boil my water solution.
Same problem using $10 aspirator (Actually $26) and slightly more powerful pump but can only draw -6 in Hg.
Mr. NurdRage,
Thank you for this video, we need more people like you
Very helpful. I always wanted to know a cheap and effective vacuum system. I had always used an aspirator from a pet store used for cleaning fish tanks but, that was a huge cost of water. Not to mention the effects on the environment. This is a perfect set-up that I wouldnt mind being abusive to since the components are so cheap. secondly I wasnt aware that you could lower the boiling point that low. My aspirator must suck because I could only get it down 15-20 degrees. This is hugely useful for not only simple things like filtration but also distilling those pesky high boiling point compounds that like to decompose at high temps. Thanks Nurdrage and keep up the good work.
Not sure where to put this comment but I need help. I rigged up a pump a little bigger than his with an identical appearing venturi and could only get down to -6 in Hg. Does this video ever come out and say what he got?
@@31946marusing ice water he was able to get water to boil at 19 C. This is about 16 mmHg (abs), or about -30 inHg (gauge I’m guessing)
After a couple of tries, I got a 14 mm x 1.0 mm pitch die that perfectly fits the inlet an aspirator that appears identical. While waiting on it, I had an experience where another aspirator would do -7" Hg with < 6 mm separation from my fitting on the pump and -28" Hg with an 18" tube. Theory is that aspirators require laminar flow input and 50 pipe diameters are required to re-establish laminar flow after passing through a pump or past a 90 degree elbow. But, enough power and it does not much matter but at the edges, it can.
on ships this is called "ejector", used for distillation of sea water, to obtain fresh water with minimal use of heat (in fact the waste heat from the engine is used), wonderful Venturi effect
Wow i had no idea this simple principle is capable of making a vacuum this good.
I've used venturi vacuum generators like this all my life for vacuum bagging composites to degassing solid propellants, vacuum molding, etc. Vacuum Forming tip; use a portable air tank for inflating tires to act as a vacuum surge tank for the initial surge to pull the vacuform material into the mold then the venturi will pull it the rest of the way into the mold. Works amazingly well for doing polycarbonate and PVC molding in the garage. :-)
Thanks for the tips!
yeah, it's so simple yet so effective. Since a machine shop almost always has a source of compressed air, the venturi pump is an extremely cost effective moderate vacuum system.
Indeed. Actually, the venturi generators that McMaster Carr sells generate huge amounts of vacuum (thought with air as the medium). During some destructive failure mode testing I did back in 2007. I was able to collapse a stainless steel case made of 3mm material measuring 400mmWx500mmHx1000mmL with one of those generators. Blew my mind.
Did you actually measure the vacuum pressure? Because even moderate pressure can bend steel. What's doing the work is the surface area of the steel since pressure is a "per unit area" effect. Ultra high vacuum and moderate vacuum actually has very little difference in terms of mechanical effects since the force applied per unit area isn't very different. But ultra high vacuum is necessary for physics work because it's the molecules themselves that are affecting the results rather the physical forces they are applying.
Hooking up a particle physics grade ion pump and a water based aspirator pump to a vacuum forming machine would show little if any noticeable difference. But hook those up to a mass spectrometer and the spectrometer would likely arc and destroy itself on the aspirator pump.
I remember having these vacuum pumps made as glassware as I was a kid. Couldn't use them for vacuum pumping those days, though, because of a lack of a high pressure water source. But they made great toys for the bath. I imagined them to be submarines.
thank you very much NurdRage, i'm building a diy fume hood and the vacuum line was a big deal, i have a 1 stage vacuum pump (for changing refrigerant in refrigerators) but water vapour is a big no for this kind of pumps ( acids and solvents are even bigger nope). many amateur chemists use the venturi pump, but as you said, using it from the tap is really a waste of water, but this setup really saved me :D
I love these type of videos!
Me too!
Me three
what you made is a scrubber. In the plant i work at it works using the same principle. It uses a venturi and caustic solution that pumps through the venturi. It generates just enough vacumm for all the reactor vents in the plant to allow gases to route to the scrubber.
It can certainly be used for scrubbing. It's a very old technology and i think even the greeks had it thousands of years ago. In this context it's an aspirator vacuum pump.
Thanks for the response!
Good day. Vacuum pump aspirations (ie hopes and dreams) have, so far, lead to failure and its keeping me from getting started on any project! To keep things straightforward, could any and all readers suggest precise Brand, Make, Model info OR specific operational statistics (specs) that they currently are using (and functions well)? Frustration levels are hitting the ceiling! And bank balances the basement!
What a great video.
so educational 😊😊
Thanks!
NurdRage Welcome :) Your videos are all educational. :)
I've done this sort of thing before with a similar setup. It never occurred to me though, to use ice water. It makes a lot of sense now that I'm thinking about it. Thanks for the tip...
what kind of connector (with size etc) did you use to connect to pump and the aspirator, because i cant seem to find one.
can someone help me i bought the aspirator and pump from aliexpress but cant find a connector
Thank you very much I did not know this method and it was very good for me to concentrate sulfuric acid since I do not have an airtight container that can be heated
greetings from Argentina
Amazing. I want to try and make this for reducing juices and sauces etc. Thanks for the tip
The reason those 12v diaphragm pumps seem amazing is a brush type 10,000 rpm universal motor. It will shoot flames and billow smoke when the commuter wear gets bad. They will still run doing that though! I got about 10-20 hours before mine went.
I tried powering one with a 3,000 rpm ac motor but that speed wasn't enough to do anything.
Another possibility if you hate universal motors like me is an ac centrifugal sump pump. They don't have the pressure of positive displacement but you can daisy chain them, the outlet of the first plumbed to the inlet of the 2nd, etc.. The first stage nearly doubles pressure and you can add multiple pumps.
is this a reccomended method for dustilling sulfuric and nitric acids?
I probably wont need this at any point in my life, but knowing how to create a vacuum using cheap parts may come in handy.
@nurdrage dumb question, but is it ok to heat the system to increase the vapour pressure in order to push the stuck water through? Also you said nothing about how to control the vaccum within this system. Turning the vaccum off? Bleeding the system? I would appreciate any help/response.
Que grande eres !!!!! I don´t know how to translate this but it feels so good watching this video....( and the one you made before it, and the one you made after, and the following......and the videos of the last year.........
Thank you very much!!!!!!!!
What adapter is used on the pump to connect the threadings of the aspirator to the pump??
This is a great tool for the home chemist. Ultimately a refrigeration vac pump is best, they can pull to 500 microns as is standard for system evacuation, they are also acid resistant since refrigerants tend to produce acids.
Please sir, what Hp (horsepower) refrigeration vacuum pump are you recommending here and how are they compared to A/C vac pump in-terms of power & chemical resistance?
Freezing bags of water. Thank you for that tidbit! That will be handy
just don't try to freeze 1L of warm water or your freezer will melt, I learned it the hard way
Hobbyist here, how well do erlenmeyers withstand a vacuum? I've always read that they shouldn't be used in vacuum setups because they easily implode. Have you ever experienced this? Do you think my cheap Chinese eBay ones would be safe to use? Thank you
+Nurdrage This is (according to auctions I have found) available in aluminum, copper, and stainless steel, all for around $10. My knee-jerk reaction is to get stainless, but I've learned watching your videos that metals don't always behave like I expect, so I wonder which is really the best choice. I also wonder if there is any benefit to getting all three and using different metals depending on what it will be used for, or if it would just be better to get three of the same kind (which ever that would be) so I have replacements when they corrode.
this vid' is exactly what i needed. esp' the part about using a tub & pump to re-circulate the water.
my need is to reduce the amount of water in an acidic plant extraction. as well as other
distillations of solvents to recover the extra solvent beyond what was needed to dissolve
the cd's of interest.
i've known of you for several years now. and held off being a patron for a lack of see you
using a spectrophotometer to monitor an experiments progress. as well as to show
us how one can be used to determine distribution-coefficients of liq-liq extractions.
and now , never mind all that, you deserve my support anyway. the next step ... reach
for my wallet
Can you please tell us where you purchased a $6 nylon diaphragm pump? I looked through your previous videos and could not find reference to it.
Very useful information. I wish I was taught this in my chem undergrad
You can use this for vacuum desiccation as well? Also, you mention this can break azeotropes. I was hoping to distill 72% perchloric acid without creating the anhydrous acid considering that the anhydrous acid comes over yellow from dissolved chlorine dioxide and I prefer to not do that..
There is great power in potentiality isn't there? Very inspiring and great video as always.
Maybe you should construct your outlet so that water can go out straightly and not through whole tubing, as going through the tubes requires additional effort so it may reduce your vacuum
Very nice work. I always used a refridgerator compressor as cheap vacuum pump in the past, I had one that could go down to 30 mmHg and that baby took solvent and corrosive vapours for years before it finally broke down. A fan on it was sufficient cooling so it could run relatively stable for 12 hours. It was free from a junkyard. I must admit that I've had others too that were not nearly that quality. You can also put two in series for a higher vacuum (or in parallel if you need a high flow rate, as they don't perform well there). I didn't use aspirators because of the waste of tap water, but I have to say your system is quite nifty, I like it very much.
EDIT: I just tested an old fridge compressor in my garage and it measured +- 60 mmHg. I guess I was lucky with my late baby child (may she rest in peace) and there is considerable variation in vacuum strength in refridgeration compressors. This one came from a cheap fridge, maybe the ones from combo fridge/freezers or those big ass American fridges or store-type deep freezers are the ones to look out for here.
hey what is that brass thingey you used to couple the aspirator to the pump
Seems a reasonably good setup for my vacuum distillation of essential oils,. Also to distill out alcohol from tinctures without rising too much the temperature and destroing essential oils.
Idd a great and relatively cheap tool to achieve vacuum. Good that you explain not to connect it to your faucet and thereby spill loads of water while polluting it. We used them in our lab till around the mid 90's, then they got banned. Now its all membrane pumps, good ones are pricey though.
That is honestly brilliant.
That's awesome. So if a 100psi pump can make 30mbar or 56mmHg, I wonder how well a fishtank pump will do? I am happy with enough vacuum to stop acid vapours from escaping.
Thank you very much. I buy this system like yours for fractional distillation. Very cheap!
Hi! You have taught me a lot through your videos NurdRage. Thanks a lot! The pump you're using, does it withstand continuous work during all the distillation run? Or does it need to be stopped periodically to cool or prevent wear on the diaphragm? I suppose using ice water helps it to run cooler but, does it need break intervals? Thank you and have a nice day!
at 4.55 where you talk about limiting of the vacuum , it is unlikely but will a more powerful water pump help avoid this problem?
I think so too, unless the low pressure causes all the water in the stream to instantly flash boil I think it would help. But it would probably take a much more expensive pump to get the same results as some ice.
It wouldn't help to get a lower pressure. With a more powerful pump you can evacuate faster, but not to a lower pressure.
In short:
As he stated, the water in the aspirator begins to boil, so no more air can get sucked in. That's the point where the end vacuum is reached with the pressure equals the vapor pressure of the liquid.
+I AM Diablo Nope, if you listen again at 4:55 i say "what limits the ultimate vacuum in this case isn't the design of the system but the working fluid." A greater pump will NOT avoid this problem. You could put the entire hoover dam behind you, and you'll never get below the vapor pressure of the working fluid.
Very neat (and cheap) solution, I didn't thought such a little water pump could handle a aspirator.
To the cheap china rotary pumps: Yes they corrode extremely easily, but for the price of 50 bucks they are quite OK.
Used one for many years, even Trichloracetic acid got in it an one point and the corrosion stopped the pump. After a little cleaning the pump was running again... (of course vacuum was not as good as stated, but for chemistry use it was OK with about 1-5mbar even after abusing )
What is the connector size needed from aspirator to water pump? I'd like to know the thread type please, thanks.
yes same I am not seeing mention of this detail in the video - am I missing it, @NurdRage? it looks like you have some brass adapter connected on the outflow of the water pump - what is this?
+NurdRage can u explain a bit on why the water is getting collected at the adapter? is the water going to the aspirator pump?
Vacuum pump oil is pretty cheap by the gallon if purchased at stores selling farm products. They sell in 1 gal increments. Not great for high vacuum purposes, but if you need to change the oil frequently like me due to contamination, it is great.
Nifty. Seen such setups before. Some that had their aspirators made from HD PP? Something like that. I think that you are right about buying the parts online, Amazon and eBay? Thanks for the demo.
Does the boiling points of other liquids change proportional to water or does other params like molar mass, density play a role?
For e.g. at usual air pressure, water 100°C and ethanol 78°C. At vaccum 70mbar water 39°C and ethanol at 30°C (percentage) or 17°C (linear)?
Hi, have you ever considered for even lower pressure to use a salt water bath with plenty of ice at below 0C. Anyway thanks for the vids
Had these in our lab in highschool 35 years ago. In fact im here to get one of these. And to hook it up to my hose.
Would you have to worry about rupturing glassware with this setup? Or will it not reach that extreme of a vacuum? 19°C is over 29 inHg, for a 50$ setup that is ridiculously good!
oh yes, glassware implosion can be a problem. Wear safety gear and eye protection
+NurdRage I guess in theory the vacuum shouldn't be turned on until you close the fume hood. But if you're working with chemicals, safety goggles are a given anyways XD
1:25 the venturi effect is also why carburetors work. Instead of gas, it pulls through gasoline and vaporizes it.
If you can get you hands on some thrown out fridges or air conditioners, you could use the compressor as a vacuum pump, a number of people have had success with them. Of course they are oil filled, and corrosive chemicals destroy them, but if you use a dessicant or appropriate adsorbent traps(activated charcoal is reasonable for organics, molecular sieves for water) they can last for a while. And often you can get compressors for free, if you salvage them from non-functional units.
Sounds awesome! maybe i'll give them a go in the future if the channel is still around.
How are you supposed to safely remove the vacuum once done and let the air back in slowly? Also, when you turn off the pump, is it possible for the water to rush into the receiving flask?
Look at the VEVOR vacuum pots which have shutoffs either side of a pressure gauge.
So. A question. If you aren't after vacuum distilling anything special, more like drying stuff out or making distilled water or lifting potable water out of seawater, can you dispense with the water jacket, or is it still needed?
5:33 so if you had the 2 tubes for the input and output of the pump connected to a sealed bottle of mineral oil, befor then filling the lines up so there would be no air. then would that work instead of having to use a big tub?
Why would you want a sealed bottle without air? That would completely defeat the purpose of the aspirator.
No. Remember that the vacuum system is sucking air from your experiment into the output flow. So even if you start without any air in the water system, the vacuum system will inject some. For this same reason the liquid system can't be entirely closed and must be able to vent.
I can just feel my gear acquisition syndrome kicking in!😉
You could also direct the waterflow from the pump through your destiller first, in order to save some more water :)
Also you could add icecubes to the mix to keep it very cold!
EDIT: Oh, seams like you did exactly that :)
I actually had two separate water circuits. As said the video i strongly recommend against pumping the contaminated through your condenser.
That must be some really tough tube on the vacuum side. 95 F requires a vac of almost -29 in Hg. All my ordinary vac tube collapses before -20 in Hg. Spring metal reinforced is the only one I know of that stays open. Love to try it with your rig but cannot get my venturis to go below -6 in Hg. Is there some critical tuning of jet release point?
Last week got a PB Auto tempered glass vacuum pot down to -27.3 in Hg in 30 minutes using a (submerged) Bel-Art aspirator and a KUNTEC 1/2HP Centrifugal Clear Clean Water Pump. Same aspirator does -28+ instantly with city water. Chapman / Humboldt H 12020 can do about the same.
OH, and boiled water at 131 F. Really weird, ran temp up to 145F before shutdown. AFTER pump off, vac held and temp drifted down with vac AND BOILING in tact till 131 F when boiling stopped.
If I use a rotary vane pump (12 CFM; max vac 2pa) with a cold trap, should my set-up work at 19 degrees like yours did? I didn't have any luck tinkering with my aspirator, so I figured I would move towards something more powerful.
It should, good luck!
@NurdRage After seeing this video I'm curious about experimenting with different fluids at cooled temperatures to see what works the best. Some dry ice will get acetone pretty cold, but would it be safe with that pump, or is there a special pump that would be needed to circulate acetone?
So,
For the dedicated amateur I'm thinking incorp a tall minifrig setup for keeping the aspirator water cooled would be +1.
Either have the aspriator pump and container all in the minifrig and run a vapor/gas release hose out the side of the frig (in case any volatile gases leeching into the aspirator need to escape from inside of the frig; or run the aspirator/container outside and basically make an DIY closed loop cooler with an aluminum radiator the container sits on, then run the intake line through your frig (almost like some extreme wort chiller setups, but with hosing and not copper piping ofc), so it is chilled before reaching the aspirator
How did you connect it to the water pump?? I have the same setup but can´t find the connector
Nice video. Do you know how much faster water will evaporate if:
1: You leave one jar of 10 cm of water in atmospheric pressure at 10 degrees centigrade
2: You leave one jar of 10 cm of water in vacuum with your setum (aspirator pump running water at 10 degrees centigrade) at 10 degrees centigrade?
I bought one after seeing this video years ago. Its never worked great. It sits in my random accessories bin years later. Ran across this video today. I might have to try it out again
Is this pump suitable for running the water through cooler and possibly for vacuum filtration/dessication?
+NurdRage why your old videos used to have an underlying title of professionalism but rather now they are DIY's and amatuerish ,and i don't mean any disregards i am a two year.old subscriber and i really appreciate your hard works
Regards
Ya think my synthesis of pyrimethamine is amatuerish? That's gotta be the hardest thing i've ever done.
NurdRage what I really meant is the setup and lab not approaches and synthesis anyhow don't mind it much just a query from a fan :b
I have been trying to freeze dry food I'm going to try one of these to get must of the water vapor and atmosphere out. Then switch to my standard rotary vane pump with a poor mans cold trap using ethanol and dry ice to get rid of what's left. The other option is to lightly add heat to the food. Will see what works I order one of these pumps
Sounds awesome!
Thanks for the video, about 10yrears ago I was trying to concentrate H2O2 from 50% to around 80% with a home made aspirator pump. But at the time I was just using water from the tap so was limited in pressure. So I might have to try this again with your setup.
Glycol is super cheap, just get concentrated engine coolant. Heck you could also get the 50/50 mix of coolant and water and use a plastic baggie filled with dry ice as the glycol coolant will drop the freezing point by a very very good amount.
I've just find out your same ProPump on Ebay,as soon as I can manage to get a glass venturi pump I'll use your same setup;if I can manage to make the device a bit more smaller for save space I'll upload a demonstration :-)
Another very nice video! Thanks
Is it possible to do this type of vacuum distillation with a soxhlet extarctor? If so is there any spacial thing to be carful of or other things to keep in mind? (I understand that things under pressure could be more dangerous)
This is an awesome video, exactly what I was looking for; thanks a lot
Excellent video thanks .
can you add salt to decrease the vapor pressure and make it get colder? or would that ruin the parts?
Better calcium chloride. Freezing point depression is a colligative property and does not depend on the species entering the solution, only on the number of particles. CaCl2 yields three particles versus two for NaCl. Note also that you can get a lower temperature if you use an additional agency of refrigeration rather than simply relying on the melting of the ice. The Fahrenheit zero is defined as the minimum temperature attainable by a well-mixed combination of well-comminuted ice and salt, but Wikipedia informs that "the minimum freezing point of a water-salt mixture is −21.12 °C (−6.02 °F) for 23.31 wt% of salt." By comparison, "Solutions of calcium chloride can prevent freezing at temperatures as low as −52 °C (−62 °F)" and "Dry ice and acetone forms a cold bath of −78 °C". [ibid]
We use that type of vacuum pump where I work, we fill gallon and half gallon bottles with milk and we get foam in the large stainless bowl so we use it to suck the foam off
Can someone help me troubleshoot my setup. I have a similar pump (80 psi and 4.5 L/min) and a different aspirator however it appears to be only pulling a weak vacuum. About 700 mmhg (absolute pressure).
Same thing here my dude. I bought the same pump and aspirator as nurdrage and Nill. So, I bought a slightly better diaphragm pump 70W 6lpm .9MPa still nothing. So, I bought a heavy duty aspirator, the kind you fit on a faucet. Couldn't pull s**t. Honestly I’m pretty peaved at nurdrage for posting this fallacious trash.
Either his pump is very different or vid is fake for views(chemists like to exaggerate yields and such for some wierd reason)
You can get ~550-600 mmHg succ force from wall water supply tho
Also make sure outgoing end of the aspirator is submerged at least at the begging
3:10 So what you're saying is that if I hook this up to my scientific glass bong, I can use it to take rips for me. Then I drink the water and get baked?
I'm kidding of course, as we all know THC isn't very water soluble. Perhaps I try everclear instead then get what you call "crunked up".
Do you mean "dead"?
Save the everclear for making tinctures with a soxhlet extractor.
Only real men drink straight everclear. Plus it doubles as mouthwash.
Null Glass perhaps use the everclear in the bong the ethenol would be a solvent THC could dissolve into...
I had thought that to get close to or above 28inHg woume require a turbomolecular pump. Now you have me wondering if that ice-water method could be used for a vacuum chamber to do some metal plating of glass. Any physic geeks around to weigh in?
To be fair, a cold trap is easily set up. Most use a two stage design, one to cool going from ambient to a few below zero, while the next stage drops much farther. They are coupled by a heat exchanger. Normal compressors can be used, just gotta swap out the refrigerants.
AppliedScience had a video on fixing his.
Really? I was under the impression it would be greater than a few hundred dollars. how much does it cost? I could never find anything cheaper. Could you give me a link to where i can buy one?
They normally are very expensive and hard to get.
An easy and cheap way would be using a "dry ice maker" with a CO2-Cylinder, so you can always make a little bit of your own dry ice for the cold trap.
+Acrakatau oh i've seen those. They're very expensive in terms of CO2 consumed. So the cost of cylinders will get you.
+Ethan M Oh i already know about that device. The thing is they cost several hundred to thousands of dollars. So really a cold trap isn't all that easy for the amateur. I thought you had a way of getting them for less than a couple of hundred when you said "To be fair, a cold trap is easily set up."
I'm wondering if it's possible to build individual fume hoods built on a similar concept.
Hi Nurdrage, maybe if you remove the one way valve you can gain 20-30 torrs. Just make sure to disconnect the vacuum tube prior to disengage the pump. ciao
So will using the vacuum pump filtration distillation method like you demonstrated effect (in terms of contaminates) the distillate in any manner? I'm working with semi volatile organics and herbs.
Could you clarify? I don't think i demonstrated simultaneous filtration and distillation. Usually you're going one or the other.
+NurdRage vacuum pump distillation**. I'm using basic distillation through a flask into a biomass (GC reservoir) flask, and distilling though a still head, vacuum distillation adapter and condenser into a pressure equalizing separatory funnel. I just wanted to know if using a vacuum pump to draw air through the system would cause loss of product or any contamination since I'm distilling essential oils with a roughly similar boiling point to that of the water distillate (hydrosol). Thanks so much! Maybe I shouldn't use the vacuum adapter at all?
Hello again, I am wondering if you used anything other than vacuum grease to secure the joints of your glassware? I have been using Dow Corning, but am concerned that there may be some leaks in my setup.
Just grease. Nothing else. Try using your aspirator to suck up water. If it can't even do that then there is something wrong with it.
@@NurdRage It is able to suck up water. So I don't think there's anything wrong with it. I just think that the vacuum it generates is for some reason not enough.
Thanks for the great video! I want to use this cheap vacuum set-up for ethanol, and it seems perfect for that, but I want to be able to distill at a temperature of my choosing (between say 35 - 50C with a rotary evaporator). So my question is: Can you vary the pump speed to give a certain vacuum, or do you always have to use the ultimate vacuum strength, (which is what you seem to do in the video)?
Thanks for your content.
Could you recommend a solid method for making non-alcoholic beer? I've tried the heating process to no avail. I'm now looking into vacuum distillation and a semipermeable membrane to separate two fractions from alcoholic beer. Thanks!
Thank you for the video and for all of your help so far! I promise this is my last question for you. Is the barometric pressure where you live relatively low? Where I live, the pressure is at 30.24 in hg. I am thinking that this is why the set-up isn't working for me.
Not really, it's very close to sea-level pressure where i am.
I wonder what kind of power supply have you used to provide electricity to pump. Car battery?
I actually almost got the exact same aspirator vacuum pump that you got (Yantra Lab I think?) Looks identical to the one from Deschem, except it's not stainless steel (which I can tell yours isn't from the texture). Apparently these ones get destroyed from any corrosive fumes relatively quickly (say for example - using it to vacuum filter or distill something with HCl).
The one I purchased is nickel coated, which apparently is even better than stainless steel.
But I plan on setting up a self contained system just like you demonstrated here. Great setup!
I too have identical venturi but cannot get it to do better than -6 in Hg. Any suggestions. Pump looks just like his but is rated 70 W and 6 L / min.
@31946mar I think just using really cold water at a fast rate... not sure what else to do that's practical and helpful.
I eventually just found some amazing KNF diaphragm vacuum pumps on GovDeals. If you need a decent vacuum then I recommend you do the same.
Two things will make it work: 8" tail tube and city water. Never could do any good with pump like one he shows.
Love your video. I'm building a vacuum pump like yours. How much sodium hydroxide & h2O ratio do you use?
what do you use to hook up the pump to the aspirator ? is it just plug and play ?
i will probably never do this but i still enjoy watching
Would this be a good option to use w/ creating vacuum in a soxhlet?
Thanks: I wondered about the relationship between pump water temp and vacuum, but never looked into it.
Cheers,
Mark
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Love your video and information. Would a 130psi pump vs 100psi be more efficient doing vacuum filteration?
Agh, I think one can consistantly say the higher psi pump would be better for vacuum filtration, esp. filtering through a medium such as diatomic earth. Just because it will have a higher flow rate! Answered that on. logic, but I am a medicinal biopsychopharmacologist!
😀