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化工学报  2015 

富钙溶液中萃取与反应耦合强化CO2矿化过程

DOI: 10.11949/j.issn.0438-1157.20150981, PP. 3511-3517

Keywords: CO2矿化,CO2捕集与封存,溶剂萃取,碳酸化,三丁胺

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Abstract:

提出一种溶剂萃取与Ca2+碳酸化的耦合反应过程,以三丁胺为萃取剂将HCl从水相萃取到有机相,在固定CO2的同时实现CaCl2的碳酸化,副产碳酸钙与氯化铵。实验结果显示,超过98%的Ca2+在1400s内沉淀为碳酸钙,反应后有机相迅速与水相实现分层,并通过与氨水反应再生,三丁胺回收率约为98%。采用粒径分布与显微镜观察证明了Ca2+沉淀过程发生在油包水结构中。以15%浓度的CO2作为碳源,反应时间为2700s时,Ca2+沉淀率达到98.31%,显示该工艺将高成本的CO2捕集过程和封存过程集成,可处理低浓度烟气中的CO2。过程无须CO2捕集费用以及热量输入,同时副产碳酸钙和氯化铵产品,有望缓解常规CO2捕集封存技术高成本的难题。

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