基于COSMO-RS的离子液体吸收CO的溶剂筛选及H_(2)/CO分离实验  

COSMO-RS based solvent screening and H_(2)/CO separation experiments for CO absorption by ionic liquids

作　　者：霍猛 彭晓婉 赵金 马秋伟 邓春[1] 刘蓓[1] 陈光进[1] HUO Meng;PENG Xiaowan;ZHAO Jin;MA Qiuwei;DENG Chun;LIU Bei;CHEN Guangjin(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《化工学报》2022年第12期5305-5313,共9页CIESC Journal

基　　金：北京市自然科学基金项目(2212016);国家自然科学基金项目(21878328)。

摘　　要：目前已有的CO吸收方法中,离子液体吸收法由于其独特的优势而备受关注。在本研究中,使用COSMO RS模型以293.15 K下离子液体对CO的选择性和黏度为指标对350种离子液体进行溶剂筛选,分析了离子液体阴阳离子构型对CO选择性的影响。在此基础上,在实验室合成了离子液体并测定了其黏度随温度的变化曲线。随后通过傅里叶变换红外光谱分析表明质子型离子液体中存在有分子间氢键作用力。使用高压透明蓝宝石釜进行了相平衡实验,测定了溶解度曲线,通过实验分析气液比对分离因子的影响。实验结果表明,在293.15 K、2.1 MPa、气液比为77.75条件下,离子液体对CO/H_(2)的分离因子可达到109.29。最后,通过FTIR证明了离子液体的稳定性,这意味着该溶剂在工业应用中具有一定的潜力。Among the currently available CO absorption methods,ionic liquid absorption has attracted much attention due to its unique advantages.In this study,350 ionic liquids were screened as solvents by the COSMO RS,using the selectivity of CO at 293.15 K and viscosity of ionic liquids as indicators.The effect of the anionic and cationic configurations of the ionic liquids on the selectivity of CO was analyzed.The ionic liquids were synthesized in the laboratory,and their viscosity-temperature curve was measured.Subsequently,Fourier transform infrared spectroscopic analysis showed that there existed intermolecular hydrogen bond force in the proton-type ionic liquid.Phase equilibrium experiments were carried out by using a high-pressure transparent sapphire kettle,solubility curves were determined,and the effect of the gas-to-liquid ratio on the separation factor was analyzed.The results showed that the separation factor of CO/H_(2)could reach 109.29 at 293.15 K,2.1 MPa,and a gas-liquid ratio of 77.75.Finally,the stability of the ionic liquid was demonstrated by FTIR,which implies that the solvent has potential for industrial applications.

关 键 词：一氧化碳吸收 溶剂筛选 离子液体 氢气提纯 

分 类 号：TQ028.2[化学工程]