Highly efficient CO_(2) capture using 2-methylimidazole aqueous solution on laboratory and pilot-scale  

作　　者：Kun Li Han Tang Shuangshuang Li Zixuan Huang Bei Liu Chun Deng Changyu Sun Guangjin Chen 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China [2]Zhejiang Tiandi Environmental Protection Technology Co.,Ltd.,Hangzhou 310012,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第3期148-156,共9页中国化学工程学报（英文版）

基　　金：The financial supports received from National Natural Science Foundation of China (U20B6005, 22178378, and 22127812)

摘　　要：To date,the primary industrial carbon capture approach is still absorption using aqueous solutions of alkanolamines.Here,to pursue a substitute for the amine-based approach to improve the CO_(2) capture efficiency and decrease the energy cost further,we report a new carbon capture approach using a 2-methylimidazole(mIm)aqueous solution.The properties and sorption behaviors of this approach have been experimentally investigated.The results show that the mIm solution has higher CO_(2) absorption capacity under relatively higher equilibrium pressure(>130 kPa)and lower desorption heat than the methyldiethanolamine solution.91.6%sorption capacity of mIm solution can be recovered at 353.15 K and 80 kPa.The selectivity for CO_(2)/N_(2) and CO_(2)/CH_(4) can reach an exceptional 7609 and 4324,respectively.Furthermore,the pilot-scale tests were also performed,and the results demonstrate that more than 98%of CO_(2) in the feed gas could be removed and cyclic absorption capacity can reach 1 mol·L^(-1).This work indicates that mIm is an excellent alternative to alkanolamines for carbon capture in the industry.

关 键 词：CO_(2) capture Absorption 2-METHYLIMIDAZOLE Separation Pilot-scale tests 

分 类 号：X701[环境科学与工程—环境工程] O645.1[理学—物理化学]