L-Lys/Gly溶剂吸收二氧化碳性能研究  

Study of CO2 capture of L-Lys/Gly solvent

作　　者：张楠[1] 骆赛赛 赵腾达 柴天祥 刘家琦 任红威 ZHANG Nan;LUO Sai-sai;ZHAO Teng-da;CHAI Tian-xiang;LIU Jia-qi;REN Hong-wei(Pollution prevention biotechnology laboratory of Hebei Province,College of Environmental Science and Engineering Hebei University of Science and Technology,Shijiazhuang 050018,China)

机构地区：[1]河北科技大学环境科学与工程学院,河北省污染防治生物技术实验室,河北石家庄050018

出　　处：《化学研究与应用》2020年第11期2049-2054,共6页Chemical Research and Application

基　　金：河北省自然科学基金青年项目(B2012208037)资助;河北省教育厅高校科学研究重点项目(ZD2018046)资助;河北省科技计划项目(18273721)资助。

摘　　要：为控制大气中CO2含量,提高CO2捕集效率,开发高效绿色CO2吸收剂具有重要现实意义。以赖氨酸(L-Lys)和丙三醇(Gly)为原料合成了低共熔溶剂(DES),并系统研究了体系的CO2捕集性能。研究发现,L-Lys与Gly物质的量配比为1/8时DES共熔点最低为20.2℃,合成过程的原位红外光谱仪检测发现1570 cm-1处有新峰生成,说明DES形成过程是以二聚体或多聚体形态存在的L-Lys固体进入Gly并形成氢键;DES传质阻力集中在低温段,适当升温可降低DES传质阻力增大CO2捕集量;同时DES受热膨胀主要影响因素是Gly;25~90℃内,DES电导率随温度升高而增大。DES捕集CO2研究发现,50℃时达到较大捕集量0.582 molCO2·mol-1DES。气体吸收过程核磁共振表征说明无新物质生成。DES体系在CO2物理吸收作用下实现CO2高效捕集。To control the content of CO2 in the atmosphere and improve the efficiency of CO2 capture,it is of great practical significance to develop efficient and environmentally-friendly CO2 absorbents.The amino acid-based Deep Eutectic Solvent(DES)was synthesized from L-lysine(L-Lys)and glycerol(Gly),and CO2 capture performance was studied.It was found that the freezing point of DES is 20.2℃when the molar ratio of L-Lys and Gly was 1/8.When Gly or L-Lys was excessive,it was easy to form dimers or multimers resulting in increasing the melting point of DES.The new peaks at 1570 cm-1 by In-situ IR spectrometer indicated that the DES was formed by Gly and L-Lys dimers or multimers.The liquid mass transfer resistance was mainly controlled in the low temperature section.Increasing temperature could reduce the resistance of DES,thus increasing the efficiency of CO2 capture.The main influencing factor of thermal expansion of DES was Gly.The conductivity of DES increased with increasing temperature ranging from 25~90℃.The results of DES capture CO2 study found that L-Lys/Gly reached the capture amount of 0.582 molCO2·mol-1DES at 50℃.The*NMR characterization found no new characteristic peaks,indicating that no new chemicals was generated during the capture of CO2.The high-efficiency CO2 capture was achieved by physical absorption of CO2 with DES.

关 键 词：二氧化碳吸收 低共熔溶剂 L-赖氨酸 吸附剂 温室气体 

分 类 号：X701.7[环境科学与工程—环境工程]