Separation of carbon dioxide (CO 2 ) from gas mixtures

Details Separation of carbon dioxide (CO 2 ) from gas mixtures Separation of carbon dioxide (CO 2 ) from gas mixtures

2005-10-20

2009-11-17

Johnson, Edward M (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

C423S220000

Reexamination Certificate

active

07618606

ABSTRACT:
A reaction-based process has been developed for the selective removal of carbon dioxide from a multicomponent gas mixture. The proposed process effects the separation of CO2from a mixture of gases by its reaction with metal oxides. The Calcium based Reaction Separation for CO2process consists of contacting a CO2laden gas with calcium oxide in a reactor such that CaO captures the CO2by the formation of calcium carbonate. Once “spent”, CaCO3is regenerated by its calcination leading to the formation of fresh CaO sorbent. The “regenerated” CaO is then recycled for the further capture of more CO2. This process also identifies the application of a mesoporous CaCO3structure, that attains >90% conversion over multiple carbonation and calcination cycles. Lastly, thermal regeneration (calcination) under vacuum provided a better sorbent structure that maintained reproducible reactivity levels over multiple cycles.

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