CO2 - O2 separtion question

[Dion]

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"?

 

[Dion]

Correction to above 70% CO2 & 30% air

 

[nbucska]

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>

 

[honeymeal]

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

 

[dcfg]

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