对二甲苯结晶相关三元和四元体系固液相平衡数据预测  

Prediction of solid-liquid phase equilibrium data for p-xylene crystallization related ternary and quaternary systems

作　　者：熊献金 XIONG Xianjin(SINOPEC Luoyang Engineering Co.,Ltd.,Luoyang 471003)

机构地区：[1]中石化洛阳工程有限公司,河南洛阳471003

出　　处：《合成纤维工业》2024年第4期52-57,共6页China Synthetic Fiber Industry

摘　　要：针对对二甲苯结晶相关的由C_(8)芳烃、甲苯和苯组成的三元和四元固液相平衡体系,选取固液相平衡计算模型—Van′t Hoff方程简式,预测了对二甲苯-乙苯-苯、邻二甲苯-乙苯-苯和间二甲苯-乙苯-苯三元体系,以及对二甲苯-间二甲苯-乙苯-甲苯、对二甲苯-邻二甲苯-乙苯-甲苯、对二甲苯-间二甲苯-乙苯-苯、对二甲苯-邻二甲苯-乙苯-苯和间二甲苯-邻二甲苯-乙苯-苯四元体系固液相平衡数据。结果表明:Van′t Hoff方程简式适用于对二甲苯装置对二甲苯结晶相关体系中由C_(8)芳烃、甲苯和苯组分组成的三元和四元固液相平衡体系计算;利用三元和四元体系固液相平衡数据可绘制各体系的固液相平衡相图,为对二甲苯结晶相关的由C_(8)芳烃、甲苯和苯组分组成的体系固液相平衡数据测量和有关研究、设计、模拟优化提供理论指导和依据。For the ternary and quaternary solid-liquid phase equilibrium systems related to the crystallization of p-xylene,which are composed of benzene,toluene and C_(8)aromatic hydrocarbons,a solid-liquid phase equilibrium calculation model,namely simplified Van′t Hoff equation was selected to predict the solid-liquid phase equilibrium data of the ternary systems of p-xylene-ethylbenzene-benzene,o-xylene-ethylbenzene-benzene and m-xylene-ethylbenzene-benzene and the quaternary systems of p-xylene-m-xylene-ethylbenzene-toluene,p-xylene-o-xylene-ethylbenzene-toluene,p-xylene-m-xylene-ethylbenzene-benzene,p-xylene-o-xylene-ethylbenzene-benzene and m-xylene-o-xylene-ethylbenzene-benzene.The results showed that the simplified Van′t Hoff equation is applicable to the calculation of the ternary and quaternary solid-liquid phase equilibrium systems composed of C_(8)aromatic hydrocarbons,toluene and benzene in the related crystallization system of p-xylene in a p-xylene unit;and the solid-liquid phase equilibrium data of the ternary and quaternary systems can be plotted separately,providing theoretical guidance and basis for the measurement of solid-liquid phase equilibrium data and related research,design and simulation optimization for the p-xylene crystallization related systems composed of C_(8)aromatic hydrocarbons,toluene and benzene.

关 键 词：二甲苯 乙苯 甲苯 苯 固液相平衡 低共熔点 

分 类 号：TQ241.1[化学工程—有机化工]