101.3kPa下异丙醇-异丁醇-正丁醇汽液平衡的测定与关联

Measurement and Correlation of Vapor-Liquid Equilibrium Data for 2-Propanol+Isobutanol+1-Butanol System at 101.3 kPa

用改进的Rose釜测定了101.3 kPa下异丙醇-异丁醇、异丙醇-正丁醇、异丁醇-正丁醇3个二元体系及异丙醇-异丁醇-正丁醇1个三元体系的汽液平衡数据。3组两元汽液平衡数据均通过了Herington热力学一致性检验,三元汽液平衡数据也通过了McDermett-Ellis热力学一致性检验。分别用Wilson、NRTL和UNIQUAC方程对二元汽液平衡数据进行了关联,得到了相应的模型参数及关联偏差。对于3个二元体系而言,Wilson和UNIQUAC模型方程比NRTL模型方程的关联效果好。最后运用关联得到的Wilson二元交互作用参数预测了三元体系的汽液平衡数据,平衡温度的平均绝对偏差为0.52℃,异丙醇的汽相摩尔组成平均绝对偏差为0.0057,异丁醇的汽相摩尔组成平均绝对偏差为0.0048,实验值与预测值基本吻合。

Isobaric vapor-liquid equilibrium （VLE） data for 2-propanol＋isobutanol, 2-propanol＋ 1-butanol, isobutanol＋1-butanol and 2-propanol＋isobutanol＋1-butanol were measured at 101.3 kPa by an improved Rose still. All the binary VLE data have passed the thermodynamic consist test proposed by Herington. The ternary VLE data also have passed the McDermett-Ellis thermodynamic consist test. The parameters and regression deviations for the Wilson, NRTL and UNIQUAC equations were obtained by correlating the binary VLE data. For the above three pairs of binary system, it was found that the correlation results of the Wilson and UNIQUAC equations are better than that of NRTL equation. At last, a prediction for the ternary VLE system was given by the correlated Wilson binary parameters. The average absolute deviation for equilibrium temperature is 0.52℃; the average absolute deviations for vapor-phase mole fraction of 2-propanol and isobutanol are 0.0057 and 0.0048, respectively. So the ternary data of the prediction agree well with the experiment data.