Hi,
I am interested in plastic based membranes for removal of water vapour and carbon dioxide from flue gases. I understood that sulfonated polyether etherketone (SPEEK) is a rather promising material for water vapour removal, but a good laminate or composite membrane that could deal with carbon dioxide gas as well, would be even more promising... Realize that the carbon dioxide + water membrane material must be able to deal with the acidic mixture (carbonic acid formed by CO2 and H2O) and other flue compositions from coal fired power plants. Moreover it should preferable be polymer based.
Do you guys have any suggestion for a plastic based long life (100.000 hours) material?
What about permeation selectivity and permeability time lag of different membrane polymers?
Cheers!
Richard
follow up posts
On 04/17/2008 Composite Analytica posts:
Dear Richard,
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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On June 13, 2008 at 22:38:56 richard pohlmann posts:
Maybe polyimides are also useful. Found this on Polyimides:
The relationship between structure and polymer permeabilty for Polyimide is good. Polyimides have glass high temperatures (usually> 200 degrees Celsius).
The selectivity of polyimides is essentially determined by the diffusion of gases and not by their solubility. In general, is the permeability of various gases by the kinetic polyimides diameter, permeability increasing in the following order: H2 > CO2 > N2. It is therefore possible CO2 with polymers of this type is separate from CO2/N2 mixtures, CO2/H2 mixtures but the H2 much permeable component. Commercial membranes from Polyimiden have typical separation CO2/H2 factors of 0.1 and CO2/N2 of 40.
Approaches for improving the permeability of CO2 are Polyimiden the Copolymerisation with PEO, the introduction of amine groups, the introduction of groups with as few rotational degrees of freedom to engorgement of the main polymer chain (Bisphenylfluorene example, combined with an increase of the volume free) or sources in Amin solutions.
How does polyimide behave in case water vapour is also present? Are there any practical examples of water/moisture and carbon dioxide and carbonic acid in polyimides in membrane application or do you still think Poly dimethyl siloxane is the most appropriate solution?
Best,
Richard
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On June 17, 2008 at 23:07:22 richard pohlmann posts:
Some additional background info:
CO2 emissions in Europe come from 33% from plants that are fossil fired. In Europe, 1 gigaton Carbon Dioxide is released into the atmosphere. One solution to reduce the exhaust, is CO2 storage underground. Among others, CO2 can be stored in empty gas fields and aquifiers.
Storage of Carbon Dioxide requires capture and separation as initial processing steps. Flue gases of fossil fired power plants consist, next to Carbon Dioxide, of Nitrogen, Water vapour and particles of dust. From the viewpoint of the selective and resistant membrane materials, CO2 capture and separation is an interesting process.
The best Carbon Dioxide membrane material is a laminate combination of existing polymer based materials. A multilayer plastic based structure could effectively deal with the subsequent CO2, N2 and H2O in the flue gas.
(source: note from Composite Analytica)
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On June 24, 2008 at 11:48:32 Rob Perry posts:
Thank you richard for commencing this thread on possible global solutions for greenhouse gases (GHG's). Indeed, besides CO2 carbon monoxide, water vapour, methane, nitrous oxide, tetrafluoromethane, Sulfur hexafluoride, CFC 11, CFC 12, CFC 113, Carbon Tetrachloride and HFC-22 capture, selective polymer membrane applications are also worthwhile looking at in the framework of the greenhouse effect.
Good luck!
ROB
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On 04/17/2008 bernard posts:
I am looking to the same issue, but from another direction. I am interested in possible relining/coating materials for existing steel (stainless & high strength) pipeline in case of carbon dioxide transport. We als have to assume that water is present. The pressure conditions are approx. 100 bar and the temperature is ambient. What sort of coating / lining do you suggest for CO2 storage?
Danke,
Bernard
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