How to effectively separate molecular Oxygen from a highly pressurized gaseous mixture of CO2 and Oxygen? Is there a way to selectively conduct atomic oxygen through some sort of membrane?
Dear Alex Naezhdin,
If you want to coat a poroz material in order to get better O2/CO2 separation use polidimethylsiloxane ( silicone rubber, shortly PDMS). A thin film of PDMS (2-5 micron) over the support and feeding the membrane from coated side is recommended.The researchers have built a small-scale reactor in their lab to test the membrane technology, and have begun establishing parameters for operating the membranes under the extreme conditions found inside a conventional power plant.
Ceramic membranes are selectively permeable materials through which only oxygen can flow. These membranes, made of metal oxides such as aluminium and titanium, can withstand extremely high temperatures — a big advantage when it comes to operating in the harsh environment of a power plant. Ceramic membranes separate oxygen through a mechanism called ion transport, whereby oxygen ions flow across a membrane, drawn to the side of the membrane with less oxygen.
In Ammonia Industries the ASU are there for separation of O2 & N2 according to its B.P. The air we breathe is composed mainly of nitrogen (78 percent) and oxygen (21 percent). The typical process to separate oxygen from nitrogen involves a cryogenic unit that cools incoming air to a temperature sufficiently low to liquefy oxygen. While the freezing technique produces a pure stream of oxygen, the process is expensive and bulky, and consumes considerable energy, which may sap a plant’s power output.
https://www.researchgate.net/post/What_are_the_best_polymer_membrane_materials_for_O2_CO2_binary_mixture_gas_separation?_tpcectx=profile_questions
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