【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)。更多还原

【Abstract】 Liquid-liquid equilibrium( LLE) data were measured for ternary system( n-heptane-cyclohexane-N,Ndimethylformamide) 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.更多还原