seperation of supercritical co2 from water at 100 deg f and 2200 psi

[Billtemper]

all

We have a interesting problem. We need to separate supercritical co2 from water. The combined mixture is at 100 deg f (we can raise that temperature to 130 deg F if needed) and is at a pressure of 2200 psi. Would a membrane work? (if so, what kind and where would I purchase one). Would it be as simple as putting a membrane in the tank 2 ft dia / 10 ft long say with the membrane at the top, and simply releasing 10 psi on one side of the membrane and allowing the Supercritical CO2 to pass thru the membrane?). How long would it take? Is there a book that explains this? Thanks in advance…

 

[zdas04]

At those conditions the density of the CO2 is 49.8 lbm/ft^3 (0.79 SG) so it seems like some sort of small centrifugal separator or even gravity separation would be effective. Unless dense phase CO2 is more hydrophillic than I think it is, this should be pretty close to the same density split as getting water out of crude oil or condensate.

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.

 

[moltenmetal]

How do you separate supercritical nitrogen from liquid water at high pressure?

...the same way- using a gas/liquid separator.

There will be a lot of CO2 dissolved in the water (more CO2 than you'd have nitrogen), but that the CO2 phase above the water is supercritical is irrelevant.