membranes for co2 separation from ng 4

[MGS]

i'm looking for data on the membranes for co2 removal, such as natco's cyanara or uop's separax (they are both asummetric cellulose acetate).
i was wondering if anybody has data on the co2/ch4 selectivity and co2 permeability in those membranes at normal operating temperature.
many thanks!

 

[mstutman]

Check out the article Roman, Fleming and Ubersax (DuPont Medal, Wilmington DE) "Game Changes in Gas-Separation Membranes," 2000 Membrane Technology/Separations Planning Conference, Newton, MA Dec. 2000. It answers some of your questions. I'm having difficulty locating a copy right now, or I would have answered your data requests directly.

 

[nbucska]

Wouldn't be simpler and cheaper to utilize the co2's
higher solubility in h20 ?

<nbucska@pcperipherals.com>

 

[sakchai72]

Dear MGS,

It is not easy to find the selectivity of those membrane from manufacturers. It depends on a lot of operating parameters such as pressure, temperature, %CO2 removal (theta value). Basically, it varies from 20-60. What i have done on this is to find an easy calculation method to estimate the selectivity to monitor the trend of selectivity deterioration.

I have a model that can be used to calculate the selectivity of CO2/CH4 which i used to monitor our membrane plant. Let see what we can share. Please feel free to contact me.

 

[MortenA]

nbucska

Extracting CO2 with water from NG would require enourmeous amount of water then following this extraction would be contaminated with water.

If you want to extract CO2 from NG then you use an amine type or a few other technologies.

Best Regards

Morten

(frankly i dont know understand why this post was &quot;starred&quot;