Catalyst – solid sorbent – or support therefor: product or process – Solid sorbent
Reexamination Certificate
2006-06-27
2006-06-27
Johnson, Edward M. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Solid sorbent
C502S340000, C502S439000
Reexamination Certificate
active
07067456
ABSTRACT:
A reaction-based process has been developed for the selective removal of carbon dioxide (CO2) from a multicomponent gas mixture to provide a gaseous stream depleted in CO2compared to the inlet CO2concentration in the stream. The proposed process effects the separation of CO2from a mixture of gases (such as flue gas/fuel gas) by its reaction with metal oxides (such as calcium oxide). The Calcium based Reaction Separation for CO2(CaRS-CO2) process consists of contacting a CO2laden gas with calcium oxide (CaO) in a reactor such that CaO captures the CO2by the formation of calcium carbonate (CaCO3). Once “spent”, CaCO3is regenerated by its calcination leading to the formation of fresh CaO sorbent and the evolution of a concentrated stream of CO2. The “regenerated” CaO is then recycled for the further capture of more CO2. This carbonation-calcination cycle forms the basis of the CaRS-CO2process. This process also identifies the application of a mesoporous CaCO3structure, developed by a process detailed elsewhere, 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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Fan Liang-Shih
Gupta Himanshu
Johnson Edward M.
Standley Law Group LLP
The Ohio State University
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