A new recovery process of carbon dioxide from alkaline carbonate solution via electrodialysis

Abstract

Abstract Bipolar membrane electrodialysis is applied to CO 2 recovery from alkaline carbonate solution. CO 2 in flue gas is captured by an alkaline hydroxide absorbing solution to form an alkaline carbonate solution. The captured CO 2 is recovered from the alkaline carbonate solution via bipolar membrane electrodialysis, and the alkaline solution is regenerated simultaneously. To reduce the power requirement for CO 2 recovery, this study considers optimal design and operation. Three membrane arrangements were compared, and the results indicate the membrane arrangement comprising a bipolar membrane and cation exchange membrane is the most energy saving. With further optimization of operation conditions, the minimum power requirement for CO 2 recovery was reduced to 2.1 MJ/kg‐CO 2 (or 2.1 GJ/t‐CO 2 ). © 2009 American Institute of Chemical Engineers AIChE J, 2009