CO_2/[Bmim]Br-AlCl_3/苯体系相平衡研究  

Phase Behavior of the CO_2/ Chloroaluminate Ionic Liquid /Benzene Ternary System

作　　者：齐国鹏[1] 孙学文[1] 赵锁奇[1] 富佳玉[1] 

机构地区：[1]中国石油大学重质油国家重点实验室,北京102249

出　　处：《高校化学工程学报》2009年第1期1-6,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(20676150)

摘　　要：在温度40～80℃、压力1.50～12.00MPa条件下,测定了CO2在氯铝酸离子液体([Bmim]Br-AlCl3)中的溶解度;在60℃以及3.00～10.00MPa条件下,测定了CO2/[Bmim]Br-AlCl3/苯三元体系中气液相平衡数据,获得了三组分物系的相图。实验结果表明:在低压条件下,CO2在离子液体中的溶解度(xCO2)随压力增加而升高;当温度在40～80℃、压力9.00～10.00MPa范围内,xCO2分别达到最大值。在CO2/[Bmim]Br-AlCl3/苯三元体系中,根据各组分的最初摩尔比的不同,平衡体系中分别会出现气-液两相及气-液-液三相。压力对富苯相中各组分影响较富离子液体更大;在60℃,10.00MPa条件下,体系中有新相生成,气-液两相区转变为气-液-液三相区。The solubility of CO2 in chloroaluminate ionic liquid was measured in the temperature and pressure ranges of 40-80℃ and 1.50-12.00 MPa, respectively. Phase equilibrium data of ternary system, CO2/ chloroaluminate ionic liquid/benzene, were presented at 60℃ and pressure ranging from 3.00 to 10.00 MPa; The corresponding ternary phase diagrams were plotted as well. The results demonstrate that the solubility of CO2 in ionic liquid enhances with the increase of pressure at low pressure, and reaches its maximum at 40-80℃ and pressure of 9.00-10.00 MPa, respectively. According to different initial molar ratios of compositions, two- or three-phase region exists in the CO2 chloroaluminate ionic liquid/ benzene ternary system. Pressure influences the equilibrium composition greatly in benzene rich phase. Under the conditions of 60℃ and 10.00 MPa, the two-phase region converts into three-phase region with the occurring of new phase.

关 键 词：二氧化碳 氯铝酸离子液体 苯 相态 

分 类 号：O642.42[理学—物理化学] O645.12[理学—化学]