A depth-suitable and water-stable trap for CO2 capture

Zhaofu Zhang; Shuaishuai Liu; Jun Ma; Tianbin Wu

doi:10.1039/d1ra01268a

A depth-suitable and water-stable trap for CO₂ capture

RSC Adv. 2021 Apr 28;11(26):15748-15752. doi: 10.1039/d1ra01268a. eCollection 2021 Apr 26.

Authors

Zhaofu Zhang¹, Shuaishuai Liu^{1

2}, Jun Ma¹, Tianbin Wu¹

Affiliations

¹ Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface and Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China zhangzf@iccas.ac.cn.
² School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences Beijing 100049 China.

Abstract

In terms of CO₂ capture and storage (CCS), it is highly desired to substitute of high efficiency process for the applied one which is far from the ideal one. Physical processes cannot capture CO₂ effectively, meanwhile CO₂ desorption is energy-intensive in chemical processes. Herein, a depth-suitable and water-stable trap for CO₂ capture was discovered. Carboxylates can react with polybasic acid roots by forming united hydrogen bonds. Carboxylate ionic liquid (IL) aqueous solutions can absorb one equimolar CO₂ chemically under ambient pressure, and its CO₂ desorption is easy, similar to that in physical absorption/desorption processes. When used as aqueous solutions, carboxylate ILs can replace alkanolamines directly in the applied CCS process, and the efficiency is enhanced significantly due to the low regenerating temperature. CO₂ (or polybasic acids) can be used as a polarity switch for ILs and surfactants. A new method for producing carboxylate ILs is also proposed.