CO_(2)在非质子溶剂与铁基离子液体复合体系中的吸收  

CO_(2) Absorption in Composite of Aprotic Solvent and Iron-based Ionic Liquid

作　　者：崔伟[1] 赵德银[1] 白文轩 张晓东[2] 余江[2] CUI Wei;ZHAO Deyin;BAI Wenxuan;ZHANG Xiaodong;YU Jiang(Sinopec Northwest Oil Field Company,Urumqi 830011,China;Research Center of Environmental Catalysis&Separation Process,School of Chemical Engineering,Beijing University of Chemical and Technology,Beijing 100029,China)

机构地区：[1]中国石油化工股份有限公司西北油田分公司,乌鲁木齐830011 [2]北京化工大学化学工程学院,环境催化与分离过程研究中心,北京100029

出　　处：《高等学校化学学报》2022年第8期39-47,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21076019,90610007);国家科技重大专项项目(批准号:2016ZX05017-004);国家“八六三”计划项目(批准号:2007AA06Z115)资助。

摘　　要：选用非质子型有机溶剂聚乙二醇二甲醚(NHD)与N,N-二甲基乙酰胺(DMAC),分别与BmimFeCl_(4)复配,构建了BmimFeCl_(4)/NHD和BmimFeCl_(4)/DMAC复合铁基离子液体体系.考察了温度、BmimFeCl_(4)/溶剂的质量比以及压力对CO_(2)在复合铁基离子液体体系中溶解行为的影响.结果表明,高压低温的吸收条件更利于CO_(2)的溶解,当BmimFeCl_(4)/DMAC质量比为7∶3时,CO_(2)在BmimFeCl_(4)/DMAC复合体系中的亨利系数为0.9181MPa·L·mol~(-1),低于同等条件下BmimFeCl_(4)/NHD体系的亨利系数.在常压、363.2 K条件下进行再生,经5次循环后,CO_(2)在BmimFeCl_(4)/NHD和BmimFeCl_(4)/DMAC中的溶解度分别为初次吸收量的92.53%和99.04%.傅里叶变换红外光谱(FTIR)结果表明,铁基离子液体复配体系吸收CO_(2)为物理吸收过程.密度泛函理论(DFT)计算与IRI分析的结果表明,在复配DMAC的体系中,CO_(2)更倾向与阳离子和溶剂分子作用,而在复配NHD的体系中,CO_(2)则更容易与阴离子和溶剂分子作用.Two kinds of aprotic solvents,polyethylene glycol dimethyl ether(NHD)and N,N-dimethylacetamide(DMAC),which have excellent desulphurization and decarbonization ability,were selected to construct composite of BmimFeCl_(4) and solvent as novel decarbonization agents.The effects of temperature,mass ratio of BmimFeCl_(4)/solvent and pressure on CO_(2) solubility were investigated.The results show that high pressure and low temperature are more conducive to the dissolution of CO_(2).The Henry coefficient of BmimFeCl_(4)/DMAC(7∶3)with 0.9181 MPa·L·mol^(−1) at 298.2 K,is lower than BmimFeCl_(4)/NHD under the same conditions,indicating that the former has a larger absorption capacity for carbon dioxide.Fourier transform infrared spectroscopy(FTIR)spectra show that the absorptions of carbon dioxide by the two composites depends on physical absorption between CO_(2) molecule and the functional groups of BmimFeCl_(4) before and after CO_(2) absorption.After five absorption-regeneration cycles of CO_(2) with the two kinds of the iron-based ionic liquid composites,the amounts of CO_(2) absorption reached 92.53%and 99.04%of the first absorption for BmimFeCl_(4)/NHD and BmimFeCl_(4)/DMAC,respectively.density functional theory(DFT)calcula⁃tions and IRI analyses show that CO_(2) is more likely to interact with[Bmim]+cations and DMAC molecules in BmimFeCl_(4)/DMAC,nevertheless,in BmimFeCl_(4)/NHD,CO_(2) is more likely to interact with[FeCl_(4)]−anions and NHD molecules.

关 键 词：铁基离子液体 二氧化碳 亨利系数 吸收 非质子溶剂 

分 类 号：O645[理学—物理化学]