SEPARATION OF CARBON DIOXIDE (CO2) FROM GAS MIXTURES BY CALCIUM BASED REACTION SEPARATION ( CaRS-CO2) PROCESS
摘要
A reaction-based process has been developed for the selective removal of carbon dioxide (CO<SUB>2</SUB>) from a multicomponent gas mixture to provide a gaseous stream depleted in CO2 compared to the inlet CO<SUB>2</SUB> concentration in the stream. The proposed process effects the separation of CO<SUB>2</SUB> from 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 CO<SUB>2</SUB> (CaRS-CO<SUB>2</SUB>) process consists of contacting a CO<SUB>2</SUB> laden gas with calcium oxide (CaO) in a reactor such that CaO captures the CO<SUB>2</SUB> by the formation of calcium carbonate (CaCOa). Once "spent", CaCO<SUB>3</SUB> is regenerated by its calcination leading to the formation of fresh CaO sorbent and the evolution of a concentrated stream of CO<SUB>2</SUB>. The "regenerated" CaO is then recycled for the further capture of more CO<SUB>2</SUB>. This carbonation-calcination cycle forms the basis of the CaRS-CO<SUB>2</SUB> process. This process also identifies the application of a mesoporous CaCO<SUB>3</SUB> structure, 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.
申请公布号
WO2007002792(A2)
申请公布日期
2007.01.04
申请号
WO2006US25266
申请日期
2006.06.28
申请人
THE OHIO STATE UNIVERSITY;FAN, LIANG-SHIH;GUPTA, HIMANSHU;IYER, MAHESH, V.