聚甲醛二甲醚体系汽液平衡数据的测定与关联

Determination and correlation of vapor-liquid equilibrium for polyoxymethylene dimethyl ether system

通过改进的Rose汽液平衡釜在常压条件下测定了PODE2-PODE3二元体系的汽液平衡数据,对所测得的实验数据进行热力学一致性检验,结果表明所测汽液平衡可通过热力学一致性检验。使用Aspen Plus v8.8模拟软件,分别对NRTL、Wilson、UNIQUAC活度系数模型进行关联,通过回归得到对应的二元交互作用参数,并将三种模型拟合所得到的汽液平衡数据与实验所得的数据相对比,得到拟合值与实验值的温度和气相组成的平均绝对偏差均不大于0.37 K和0.0044,表明3种模型的拟合结果与实验数据吻合均较好,偏差均在合理范围内。这些工作为化工数据库增添了精馏的基础数据,也为含PODE2和PODE3体系的精馏设计与工程设计的进一步深入研究奠定了基础。

The vapor-liquid equilibrium data of the PODE2-PODE3 binary system was determined by the modified Rose vapor-liquid equilibrium reactor under normal pressure conditions.The thermodynamic consistency test was carried out on the measured experimental data,and the results showed that the measured vapor-liquid equilibrium could pass the thermodynamic consistency test.The Aspen Plus v8.8 simulation software was used to correlate the NRTL,Wilson,and UNIQUAC activity coefficient models respectively,and the corresponding binary interaction parameters are obtained through regression.By comparison,the average absolute deviations of the temperature and vapor phase composition between the fitted and experimental values are not more than 0.37 K and 0.0044,respectively,indicating that the fitted results of the three models are in good agreement with the experimental data,and the deviations are all within a reasonable range.This work adds basic data for distillation to the chemical database,and also lays the foundation for further research on distillation design and engineering design with PODE2 and PODE3 systems.