丙酮-异丙醇-甲基烯丙醇体系气液平衡数据测定及关联

采用双循环气液平衡釜,测定了常压(101.3 kPa)下丙酮-甲基烯丙醇和异丙醇-甲基烯丙醇二元体系以及部分丙酮-异丙醇-甲基烯丙醇三元体系的气液平衡数据。二元气液平衡数据经Herington面积检验法检验,符合热力学一致性。用Wilson和NRTL液相活度系数方程对两个二元体系的气液平衡数据进行关联,效果良好。由关联得到的两个二元体系的Wilson和NRTL模型参数,及Aspen Plus数据库中的丙酮-异丙醇体系的Wilson和NRTL模型参数预示部分三元体系的气液平衡数据,与实验值相比,丙酮、异丙醇和甲基烯丙醇气相摩尔分率平均绝对偏差分别小于0.0137、0.0113、0.0117。实验数据和关联结果为该三元体系的精馏分离提供了一定的基础数据。

Measurement and correlation of vapor-liquid equilibria data for acetone-isopropanol-methallyl alcohol system

Vapor-liquid equilibrium (VLE) data for acetone (ACT)-methallyl alcohol (MAO) binary system, isopropanol (IPA)-methallyl alcohol binary system and parts of ACT-IPA-MAO ternary system were determined in an Othmer equilibrium at atmospheric pressure (101.3 kPa). The experimental data of binary system were verified by Herington method and were consistent with thermodynamics. The data of ACT-MAO and IPA-MAO binary systems were correlated with the Wilson and NRTL models by Aspen Plus. Respectively, the two models were correlated well with the VLE data and the interaction parameters of ACT-MAO and IPA-MAO were obtained. The Wilson and NRTL interaction parameters of ACT-IPA were already available in Aspen Plus database. Then the vapor compositions of the ternary system were calculated with these interaction binary parameters. Compared with measured experimental VLE data, the mean absolute error of mole fraction for ACT, IPA and MAO is less than 0.0137, 0.0113 and 0.0117. The experimental and correlative data could provide a basis for the distillation separation of ACT-IPA-MAO system.