Why does the stream that enters dryer contain the same amount of caffeine as that exiting it if the recycle to the mixing tank is contaminated with caffeine?
great question. I think you are confusing the two recycle streams. The recycle stream that goes from the extraction unit back to the feed line and into the mixing tank is contaminated with caffeine. The recycle stream leaving the dryer is not contaminated with caffeine.
Francess Nkute That is because after solving the balances for the overall system and the mixing tank, the other variables (m4 and m5) have been calculated.
Thanks for the note. If you look closely at the diagram, you see that you also have 18 g coming back into the mixing tank. You can either count both of those streams or you can just count what leaves the dryer, 2 kg DCS. So the equation is correct, but the explanation could have been more clear.
Excellent explanation! Thank you very much for posting this! :D
I'm truly grateful to you.
Thanks a lot. ❤
Do you know what unit operations are involved in this process? I would assume extraction and drying, but are there any more?
Why does the stream that enters dryer contain the same amount of caffeine as that exiting it if the recycle to the mixing tank is contaminated with caffeine?
great question. I think you are confusing the two recycle streams. The recycle stream that goes from the extraction unit back to the feed line and into the mixing tank is contaminated with caffeine. The recycle stream leaving the dryer is not contaminated with caffeine.
what is the question fpr this problem? i mean in words of paragraph?
why exactly does the extraction unit have only m6, x as the unknowns
Francess Nkute That is because after solving the balances for the overall system and the mixing tank, the other variables (m4 and m5) have been calculated.
0.95(m3)=0.88(m4)+20 kg that leaves with the coffee beans. You wrote 2 instead of 20 :)
Thanks for the note. If you look closely at the diagram, you see that you also have 18 g coming back into the mixing tank. You can either count both of those streams or you can just count what leaves the dryer, 2 kg DCS. So the equation is correct, but the explanation could have been more clear.
0.95(m3) + 18 = 0.88(m4) + 20 giving us 0.95(m3) = 0.88(m4) + 2
Things went over my head