环己烷-正庚烷-N,N-二甲基甲酰胺体系液液相平衡测定与关联  

Measurement and correlation of liquid-liquid equilibria for cyclohexane-heptane-N,N- dimethylformamide ternary system

作　　者：张吕鸿[1] 陈云[1] 王世强[2] 肖晓明[1] 姜斌[1,2] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津大学精馏技术国家工程研究中心,天津300072

出　　处：《化学工程》2014年第12期34-38,共5页Chemical Engineering(China)

摘　　要：采用平衡釜法测定了三元体系(环己烷+正庚烷+N,N-二甲基甲酰胺)在常压不同温度(30,40,50℃)下的液液相平衡数据。实验数据用Bachaman及Othmer-Tobias进行可靠性关联,关联结果表明数据的可靠性较好,根据实验结果绘制了三元相图。对不同温度下的液液平衡实验数据,分别用NRTL和UNIQUAC活度系数方程进行了关联,求得方程的二元交互作用系数,关联结果表明NRTL和UNIQUAC方程对该体系适用较好。由实验数据计算得到衡量N,N-二甲基甲酰胺抽提性能的参数(分配系数、分离因子、选择性系数)。Liquid-liquid equilibrium （LLE） data were measured for ternary system （n-heptane-cyclohexane-N,N-dimethylformamide） at atmospheric pressure and different temperatures （30, 40, 50 ℃）.The experimental data were correlated using the Bachman and the Othmer-Tobias correlation , and the results showed a good correlation . Complete phase diagrams were obtained by tie-line data and determining solubility .The universal quasichemical activity coefficient （ UNIQUAC） and the non-random two-liquid equation （ NRTL） were used to predict the phase equilibrium in the system by the interaction parameters from the experimental data .It shows that UNIQUAC and NRTL used for LLE can provide a good correlation .The separation factors , distribution coefficients and selectivity were obtained according to the experimental data .

关 键 词：环己烷 正庚烷 N N-二甲基甲酰胺 液液相平衡 

分 类 号：O642.42[理学—物理化学]