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

✍ Scribed by Hiroki Nagasawa; Akihiro Yamasaki; Atsushi Iizuka; Kazukiyo Kumagai; Yukio Yanagisawa

• Publisher: American Institute of Chemical Engineers
• Year: 2009
• Tongue: English
• Weight: 406 KB
• Volume: 55
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.11907

✦ Synopsis

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