6 replies to this topic

[normal2500]

hi guys


i am doing research on design of cryogenic distillatin

no nearly two week i search about it, but i could not find that much of information

do u know about it and can u help me>

[pleckner]

Do a "Google" search on "Cryogenic Distillation". I got 35,000 hits.

If after looking at some of these you have some specific quesitons, just post them.

[normal2500]

Do a "Google" search on "Cryogenic Distillation". I got 35,000 hits.

If after looking at some of these you have some specific quesitons, just post them.

i did that
but the problem i wana to compare between the design of cryogenic distillation and the normal distillation and how far the technology going in cryogenic distillation

[Art Montemayor]

Normal:

Believe me, when you dissasemble a cryogenic distillation tower - such as an air separation column - you will not find any difference between the internals you find there and the internals of a conventional distillation column. And you shouldn't.

Do you believe that there is something magical and mysterious behind the distillation of cryogenic liquids as compared to conventional liquids such as methanol or ethanol? I can assure that there isn't. I know, because I have dissasembled several cryogenic distillation towers and re-assembled them back together with nothing to report or to get excited about. The units had to be taken apart because of contamination with chemicals and adsorbent dust. Once I put them back together, they worked better than before.

I don't understand why you would expect the technology to be any different. Liquids behave like liquids are expected to behave. The Brown-Souders equation is used to design the spacing between trays and the weir heights and downcomer residence times are similar to those of other liquids. Perhaps you don't know how cryogenic distillation is done because you also don't know how conventional distillation is done. Am I correct?

The only major mechanical difference in the cryogenic process is the maintenance of the low internal temperature. For that, you employ a Cold Box - nothing more than a housing around the column, filled with perlite or other insulation. There are techniques used to save on preserving the low temperature and reduce as much piping as possible. That's why you'll find a lot of internal reboilers/condensers designed into the units. But they operate just as conventional ones - no different.

Perhaps you have specific areas of interest or of lack of knowledge that you don't understand. If so, state those specifics and perhaps we can help. If you are still interested in knowing more about cryogenic distillation, than follow the advice given by Phil Leckner.

[Fahrur Rozi]

Do a "Google" search on "Cryogenic Distillation". I got 35,000 hits.

If after looking at some of these you have some specific quesitons, just post them.

Can you give me some picture of Tray for cryogenic distillation collumn?? If so, please send to fahroer_rozi_d@yahoo.com

I really need the picture to distinguish Tray for common distillation and Cryogenic distillation

[Fahrur Rozi]

Can you give me some picture of Tray for cryogenic distillation collumn?? If so, please send to fahroer_rozi_d@yahoo.com

I really need the picture to distinguish Tray for common distillation and Cryogenic distillation
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