UNIFAC模型关联CH_3OH/C_2H_5OH-[Mmim]DMP体系的汽液相平衡  

Vapor-Liquid Equilibrium of CH_3OH/C_2H_5OH-[Mmim]DMP Systems with UNIFAC Model

作　　者：李静[1] 周盛义 王克良[1] 李国雨 李志[1] 陈定梅[1] 

机构地区：[1]六盘水师范学院化学与化学工程系,贵州六盘水553004

出　　处：《中北大学学报（自然科学版）》2015年第3期338-342,共5页Journal of North University of China(Natural Science Edition)

基　　金：国家级大学生创新创业训练计划资助项目(201310977005);贵州省联合基金项目(黔科合J字LKLS[2013]28号);贵州省教育厅重点科研项目(黔教合KY字[2014]282);贵州省教育厅特色重点实验室项目([2011]278);贵州省煤系固体废弃物资源化技术创新团队(黔教合人才团队字[2014]46)

摘　　要：基于基团贡献法,采用UNIFAC模型关联了已有实验数据的吸收式制冷循环工质对甲醇-1,3-二甲基咪唑磷酸二甲酯盐(CH3OH-[Mmim]DMP)和乙醇-1,3-二甲基咪唑磷酸二甲酯盐(C2H5OH-[Mmim]DMP)体系的汽液相平衡数据.获得了新基团[mim]DMP和其他基团间的UNIFAC相互作用参数,扩充了UNIFAC模型的应用范围.用拟合的基团相互作用参数计算了CH3OH-[Mmim]DMP和C2H5OH-[Mmim]DMP体系的的汽液相平衡数据,并同实验数据进行了比较,平均相对偏差(ARD)分别为0.91%和2.39%.说明采用UNIFAC模型预测效果很好,能够很好描述二元体系的VLE行为.最后,对CH3OH-[Mmim]DMP和C2H5OH-[Mmim]DMP体系的蒸气压数据进行了比较,发现离子液体[Mmim]DMP的与乙醇的亲和性要强于甲醇,C2H5OH-[Mmim]DMP体系更具有成为吸收式制冷循环工质对的潜力.The vapor-liquid equilibrium data of methanol-1,3-dimethylimidazolium dimethylphosphate（CH3OH-[Mmim]DMP）and ethanol-1,3-dimethylimidazolium dimethylphosphate（（C2H5OH-[Mmim]DMP）systems used in absorption refrigeration cycle working fluid were correlation with the experimental data by using the UNIFAC model which based on group contribution method.According to the experimental data,the UNIFAC interaction coefficients of the new group [mim]DMP and other groups were obtained,which extended the applied ranges of UNIFAC model.Based on the interaction coefficients of matching groups,vapor-liquid equilibrium data of CH3OH-[Mmim]DMP and C2H5OH-[Mmim]DMP systems were calculated and compared with the experimental data.The average relative deviations（ARD）were 0.91% and 2.39%.The prediction effect of the UNIFAC model is very good and can well describe VLE behavior of the two element system.At last,the vapor pressure data of CH3OH-[Mmim]DMP system and C2H5OH-[Mmim]DMP system were compared.The result shows that the affinity of [Mmim]DMP and C2H5 OH is stronger than [Mmim]DMP and CH3 OH,so C2H5OH-[Mmim]DMP system has the potential to be the absorption refrigeration cycle working fluid pair.

关 键 词：UNIFAC模型 离子液体 汽液相平衡 

分 类 号：TQ013[化学工程]