常压下六甲基二硅醚-1,2-二氯乙烷汽液平衡数据的测定与关联

Determination and correlation of vapor-liquid equilibrium data for hexamethyl disiloxane-ethylene dichloride system at 101.3 kPa

使用改进的Othmer釜测定了常压(101.3 kPa)下六甲基二硅醚-1,2-二氯乙烷二元物系的等压汽液平衡数据.实验数据通过Herington面积积分法检验,符合热力学一致性.采用NRTL、Wilson、UNIQUAC三种热力学模型分别对实验数据进行关联,得到模型参数,并将汽液平衡数据的计算值与实验值进行对比.结果表明,常压下六甲基二硅醚-1,2-二氯乙烷二元物系具有最低共沸点,共沸温度为354.73K,六甲基二硅醚的摩尔分数为0.1995(质量分数29.02%).通过计算值与实验值的对比,表明NRTL模型在预测常压下六甲基二硅醚-1,2-二氯乙烷二元物系汽液平衡数据时,能较好地重现实验数据,拟合精度较高.

Isobaric vapor-liquid equilibrium(VLE) data for hexamethyl disiloxane(HMDSO)-ethylene dichloride(EDC) system was determined by a double circulation VLE kettle at 101.3 kPa.Test was made for thermodynamic consistency of the experimental data by Herington method.The experimental data was correlated by NRTL,Wilson and UNIQUAC models,estimated model parameters,respectively.The VLE data was calculated by obtained parameters and compared with experimental data.The results show that HMDSO-EDC system had a minimum azeotropic temperature at 354.73 K,the mole fraction of HMDSO was 0.199 5(mass fraction was 29.02%).The comparison made between calculative data and experimental data show that NRTL was better than Wilson and UNIQUAC models for calculating the VLE data for HMDSO-EDC system at 101.3 kPa.