Carbon dioxide gas removal from flue gas from coal plants is a rather actual subject. Here (in Holland) we have several companies who are/will be involved in Carbon dioxide capture and subsequent conveyance via pipelines and storage in natural gas / oil resevoirs to prevent global warming.

By the way, there are technical specialists who claim that carbon dioxide is not causing global warming, but water vapour. In modern society, the exhaust of water is several magnitudes larger than carbon dioxide...

However, we are not specialists in global warming, so back to your issue. Taking the above into account it is a good idea to capture water as well as carbon dioxide from flue gas in one step (for several reasons).

We have some experience with sulfonated polyether etherketone (s - peek). Very probably there are more effective materials available for water removal (however the processing conditions are not clear in this tage). If you want to remove carbon dioxide, you should use at - low water humidities - a laminate solution based on a water selective membrane and a carbon dioxide gas selective membrane like poly dimethylene siloxane (pdms).

Hope this helps ;-)

Best Regards,
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