1-氨丙基-3-甲基咪唑溴水溶液中二氧化碳水合物的生成特性  

Properties of Formation of Carbon Dioxide Hydrate in 1-Aminopropyl-3-Methyl-Imidazolium Bromide Aqueous Solutions

作　　者：毕崟[1] 李松[1] 郭开华[1] 

机构地区：[1]中山大学-BP液化天然气教育培训与研究中心,中山大学工学院,广东广州510006

出　　处：《石油化工》2015年第9期1061-1065,共5页Petrochemical Technology

基　　金：国家自然科学基金资助项目(51076169);广东省自然科学基金重点项目(9251027501000001)

摘　　要：在可视化高压低温测试系统中，研究了吸收CO2的功能型离子液体1-氨丙基-3-甲基眯唑溴（[APMim][Br]）水溶液中CO2水合物的生成特性，在273．15～283．15K、1．0～4．5MPa下，获得了不同含量的[APMim][Br]水溶液中CO2水合物-[APMim][Br]水溶液-CO2气体三相和CO2水合物-[APMim][Br]水溶液-CO2气体-液态CO2四相相平衡数据。实验结果表明，当[APMim][Br]水溶液中[APMim][Br]含量达35％（w）时，CO2水合物仍可生成，形成[APMim][Br]吸收CO2和气体水合物固定CO2的双重体系。与纯水相比，[APMim][Br]水溶液中CO2水合物生成的温度较低、生成压力较高，说明[APMim][Br]对CO2水合物的生成有一定抑制作用。基于离子液体水溶液缔合特性的活度系数模型理论，对[APMim][Br]水溶液中CO2水合物的相平衡特性进行了计算，实验值和计算值有很好的一致性，平均相对误差为1．6％。1-Aminopropyl-3-methyl-imidazolium bromide（ [APMim ] [Br ] ） exhibits a good selectivity for CO2 absorption and its aqueous solutions have a great prospect for CO2 capture. The formation of CO2 hydrate in the aqueous solutions of [APMim] [Br] was researched. In the temperature range of 273.15-283.15 K, the three phase equilibrium and four phase equilibrium in the formation of CO2 hydrate in the [APMim] [Br] aqueous solutions with different water mass fraction were investigated in a high-pressure quartz glass reactor. The results showed that CO2 hydrate could form in 35%（w） [APMim] [Br] aqueous solution, and there were two systems, namely the capture of CO2 in the hydrate and the absorption of CO2 in the [APMim] [Br] aqueous solutions. Compared with the formation of CO2 hydrate in water, in the [APMim] [Br] aqueous solutions, the temperature for the formation of CO2 hydrate was low but the pressure was high. An activity coefficient model based on the ionic liquid aqueous solutions was applied to calculate the phase equilibrium and CO2 solubility in the ionic liquid aqueous solution, and the average relative error was 1.6%.

关 键 词：离子液体 二氧化碳水合物 相平衡 

分 类 号：TQ026[化学工程]