甲苯与C_(8)芳烃及苯多元体系固液相平衡数据预测

Prediction of solid-liquid phase equilibrium data for toluene and C_(8)aromatics and/or benzene multi-component system

在对二甲苯结晶相关体系中,针对正常熔点非常接近的甲苯和乙苯两种组分同时存在的多元体系,利用固液相平衡计算模型——Van′t Hoff方程简式预测了乙苯-甲苯-苯三元体系,对二甲苯-乙苯-甲苯-苯、间二甲苯-乙苯-甲苯-苯、邻二甲苯-乙苯-甲苯-苯和间二甲苯-邻二甲苯-乙苯-甲苯等四元体系,及对二甲苯-邻二甲苯-乙苯-甲苯-苯、对二甲苯-间二甲苯-乙苯-甲苯-苯和间二甲苯-邻二甲苯-乙苯-甲苯-苯等五元体系的固液相平衡数据。这些新的相平衡数据未见文献报道,可为对二甲苯结晶相关体系的固液相平衡研究提供理论依据和指导。

The normal melting point of toluene and ethyl benzene is very close.In the related system of p-xylene crystallization,for the multi-component system in which toluene and ethylbenzene exist at the same time,a solid-liquid phase equilibrium calculation model namely simplified Van′t Hoff equation is selected.This model is used to predict the solid-liquid phase equilibrium data of the ternary system of ethylbenzene-toluene-benzene and the quarternary systems of p-xylene-ethylbenzene-toluene-benzene,m-xylene-ethylbenzene-toluene-benzene,o-xylene-ethylbenzene-toluene-benzene and m-xylene-o-xylene-ethylbenzene-toluene and the quinary system of p-xylene-o-xylene-ethylbenzene-toluene-benzene,p-xylene-m-xylene-ethylbenzene-toluene-benzene and m-xylene-o-xylene-ethylbenzene-toluene-benzene.These new phase equilibrium data have not been previously reported in the literature.This paper can provide theoretical basis and guidance for the study of solid-liquid phase equilibrium of p-xylene crystallization related systems.