胍类氨基酸离子液体捕集烟气中CO_(2)实验研究  

Experimental study on the capture of CO_(2) in flue gas by guanidine amino acid ionic liquids

作　　者：王琪 李爱蓉[1] 康洛铭 王军[2] 廖铁 肖杨 王治红[1] Wang Qi;Li Airong;Kang Luoming;Wang Jun;Liao Tie;Xiao Yang;Wang Zhihong(School of Chemistry and Chemical Engineering,Southwest Petroleum University.Chengdu,Sichuan,China;Natural Gas Purification Plant General,PetroChina Southwest Oil&Gasfield Company,Chongqing,China)

机构地区：[1]西南石油大学化学化工学院 [2]中国石油西南油气田公司天然气净化总厂

出　　处：《石油与天然气化工》2023年第6期15-22,共8页Chemical engineering of oil & gas

基　　金：四川省自然科学基金项目“低能耗水合物法分离捕集烟气中CO_(2)过程强化关键技术研究”(2022NSFSC0198)。

摘　　要：目的通过开展胍类氨基酸离子液体捕集烟气中CO_(2)性能研究实验,找到吸收性能好、溶剂损失少和能耗低的新型CO_(2)吸收剂。方法以四甲基胍(TMG)为阳离子,赖氨酸(Lys)、丙氨酸(Ala)和天冬氨酸(Asp)为阴离子,制备了[TMG][Lys]、[TMG][Ala]和[TMG][Asp]3种低黏度胍类氨基酸离子液体,并对其脱碳性能进行评价。结果碱性较大的[TMG][Lys]具有较高CO_(2)吸收量,在常压、45℃、80 mL/min的条件下,吸收量为0.64 mol CO_(2)/mol IL。水的加入对CO_(2)的吸收有积极的影响,30%(w)[TMG][Lys]水溶液的吸收量增加到0.99 mol CO_(2)/mol IL,且经过5次吸收-解吸循环后仍能达到0.81 mol CO_(2)/mol IL。通过傅里叶红外光谱(FT-IR)、核磁共振氢谱(1H-NMR)对[TMG][Lys]的脱碳机理进行分析,CO_(2)主要通过与阴离子上的氨基反应生成氨基甲酸酯,以实现对烟气中CO_(2)的高效捕集。结论该研究可为工业CO_(2)捕集高效低耗吸收剂的开发提供参考。Objective In order to find a new absorbent with good absorption performance,low solvent loss,and low energy consumption for CO_(2) capture,the preparation and performance of guanidine amino acid ionic liquids to capture CO_(2) in flue gas was investigated.Methods Three kinds of guanidine amino acid ionic liquids with low viscosity,namely[TMG][Lys],[TMG][Ala],and[TMG][Asp],were prepared using tetramethylguanidine(TMG)as a cation and lysine(Lys),alanine(Ala),and aspartic acid(Asp)as anions.The effects of anionic types on CO_(2) absorption were investigated.Results The alkaline[TMG][Lys]had a higher CO_(2) absorption,with a CO_(2) absorption capacity of 0.64 mol CO_(2)/mol IL under the condition of atmospheric pressure,45℃,and 80 mL/min.The addition of water had a positive effect on the absorption of CO_(2).The absorption capacity of 30 wt%[TMG][Lys]aqueous solution increased to 0.99 mol CO_(2)/mol IL and could still keep 0.81 mol CO_(2)/mol IL after 5 absorption-desorption cycles.The decarbonization mechanism of[TMG][Lys]was analyzed by Fourier transform infrared spectroscopy(FT-IR)and nuclear magnetic resonance hydrogen spectroscopy(1H-NMR).CO_(2) mainly reacts with the amino group on the anion to form carbamate to achieve efficient capture of CO_(2) in the flue gas.Conclusions It can provide reference for the development of new absorbents in industrial CO_(2) capture.

关 键 词：二氧化碳捕集 离子液体 氨基酸 烟气 吸收机理 

分 类 号：TQ028.17[化学工程] X701[环境科学与工程—环境工程]