Part 5 - Why Vacuum column diameter is larger than Atmospheric Column?

Chemical engineering interview question answered. This part discuss about the effect of pressure on Column diameter. One point I forget to mention in this context. Some time in interview one question asked is 'Why Vacuum Column is costlier than Atmospheric Column?' The one answer may be Column diameter is large. But it does not give clear picture because at low pressure relative volatility increases. So height required may be less. Actual answer is the thickness of Column Shell. Thickness of Column shell remain high for vacuum column as there is very low inside pressure and outside pressure is atmospheric pressure. So stress will be high.
Part 1 - Tray Pressure drop in a Distillation Column and Weeping
• Part 1 - Tray Pressure...
Part 2 - Entrainment or Jet Flooding in distillation Column
• Part 2 - Flooding in d...
Part 4 - Dumping, Stability diagram, turndown ratio & Mechanical problems leads to flooding/Dumping
• Part 4 - Dumping, Stab...
Part 3 - Downcomer Backup flooding and downcomer choke flooding
• Part 3 - Flooding in d...

[@SandeepAcademy9]

One point I forget to mention in this context. Some time in interview one question asked is 'Why Vacuum Column is costlier than Atmospheric Column?' The one answer may be Column diameter is large. But it does not give clear picture because at low pressure relative volatility also increases. So height required may be less. Actual answer is the thickness of Column Shell. Thickness of Column shell goes high for vacuum column as there is very low inside pressure and outside pressure is atmospheric pressure. So stress will be high.

[@PrakashKumar-nt9ek]

Sandeep Academy vacuum column is tray column or packed column, if packed which type of packing ...And how do we increase or decrease pressure inside the column

[@PrakashKumar-nt9ek]

Plz reply sir

[@SandeepAcademy9]

In our VDU it is structured packing.Only draw trays are Chimney trays. Pressure can be increased/decreased using pressure control valve. In VDU we can increase/decrease vacuum by adjusting steam in ejectors. Hope it make sense to you. But we never change pressure to increase throughout, the concepts maintained in last part of video is only helpful if your throughout is limited by column flooding.

[@Shubham-fe7il]

@@SandeepAcademy9 Sir i have studied on net that As a rule of thumb, plates are always used in columns of large diameters.... So VDU should have tray, isn't? Please clarify my doubt. Thank You,by the way,you are best.

[@debdattaguha]

@@Shubham-fe7il Vacuum Columns are prone to collapse hence VDUs are packed towers as the packing as acts as a support.

[@debdattaguha]

Your videos provide very high quality knowledge. Pls make more videos. Thank you!

[@rajusinghpatel8654]

Excellent way of teaching...Great job..!!!

[@SandeepAcademy9]

Raju Singh Patel Thanks Rajuji for your kind words !!

[@satishlukka1454]

Sir please make a video of
Temperature , pressure , concentration profile variations in distillation column also

[@tusharshelar5074]

Dear sir,
Please make lecture series on distillation column design, selection and types of tray

[@faisaljummal8101]

Thanks a lot

[@parthdadhaniya8405]

Sir can you please make video on , temperature and velocity profile in case of free convection and forced convection for different element like cylinder ,sphere,plate etc.

[@souravkumar2522]

Nice video sir ....plz make a video on distillation column diameter calculation .

[@SandeepAcademy9]

Already made, watch flooding video

[@AmanVerma-rc2pq]

Sir ji please make this video and topic in Hindi. so that we can understand well.

[@vishalverma210]

Also explain the effect of pressure on column height,...
For a same binary mixture and same process conditions inside two columns, one is operated under vacuum and other is operated under atmospheric pressure..
In which case, number of theoretical stages( column height) will be less..??

[@abhishekkadam6220]

How does volumetric flowers increases with vapour density

[@debasishgogoi3495]

Sir can we apply Boyle's law
That since pressure is low so volume will be more?

[@fanindia684]

Sir, column differential pressure is very less(25 mmHg) in vacuum column compared to atmosphere column differential pressure (400 mmHg= 0.5kgf/cm2) , it may be the region that vapor velocity will be less in vacuum column.

[@vaghelajay1437]

why top section of vaccum column is smaller than it's middle and lower section

[@adorable6462]

Sir, Hindi language m bana do please..? Ache se samjh nhi paa raha hu..?

[@sanjeevgehlot9442]

Sir reflux drum and packed distillation column pr bhi lecture bnaye plz.

[@SandeepAcademy9]

Ha plan to tha banane ke liye...but dekha ye videos koi dekhta nahi....isliye banaya nahi....ye sab videos banane me bahut time lagta h......wo mehnat justify nahi ho paata....fir bhi dekhunga...future me jab time milega tab jarur banawunga....

[@abhishekchavan6943]

Sir, thoda time lg sakta hai ki kaafi jyada views aaaye...but jo log dekhrahe hai...honestly your videos are really really very helpful! Thanks a lot! Continue to keep inspiring us!

[@akshpatel2868]

@@SandeepAcademy9 yes sir it's right that viewers are moderate but sir sab log is high level ke knowledge Tak nai pohoch sakte na. I guarantee ki is type ka knowledge koi bhi UA-cam channel ne share nai koya hoga. Please sir make more video