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CO2 - O2 separtion question

thread135-12917

CO2 - O2 separtion question

CO2 - O2 separtion question

(OP)
I have a gas stream that is ~70% CO2 and ~70% air.  I would like to recover the CO2 from the stream at a high purity (less than 100PPM Oxygen).   I only need to recover 30-50% of the raw gas stream to make this viable.  Any suggestions on a membrane?  Is there simulation software avilalble to be able to play "what if"?

RE: CO2 - O2 separtion question

(OP)
Correction to above 70% CO2 & 30% air

RE: CO2 - O2 separtion question

The molecular weights : O2=32, N2=28, C02 = 44

I don't think the difference is enough to enable you to
use a membrane separation.

Can't you use the difference in the solubility in H2O ?

<nbucska@pcperipherals.com>

RE: CO2 - O2 separtion question

Try using mixed matrix membrane. The membrane contains zeolite on polymer substrate. it works well on the separation of CO2 from N2 and CO2 from O2.

References : "Gas permeation characteristics of polymer-zeolite mixed matrix membranes" Journal of membrane science (1994), 91, pp 77 and " A new composite membrane for selective transport of gases" in Proceedings of the 6th international symposium on synthetic membranes in science and indeustry, Germany, 1989

RE: CO2 - O2 separtion question

Try using cryogenics.  This is routinely done for air pre purification.

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