二甲苯与甲苯及苯多元体系固液相平衡数据预测  

Prediction of solid-liquid phase equilibrium data for xylene and toluene or/and benzene multicomponent 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》2025年第1期52-56,共5页China Synthetic Fiber Industry

摘　　要：针对对二甲苯(PX)结晶相关的由二甲苯(包括PX、间二甲苯(MX)和邻二甲苯(OX))、甲苯(TOL)和苯(BEN)组成的三元及以上体系,选取固液相平衡计算模型—Van′t Hoff方程简式,预测了PX-TOL-BEN、MX-TOL-BEN和OX-TOL-BEN三元体系与PX-MX-TOL-BEN、PX-OX-TOL-BEN、MX-OX-TOL-BEN和PX-MX-OX-TOL四元体系及PX-MX-OX-TOL-BEN五元体系固液相平衡数据。结果表明:Van′t Hoff方程简式适用于PX装置PX结晶相关体系中由二甲苯、TOL和BEN组分组成的三元、四元和五元体系的固液相平衡计算;利用三元、四元和五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PX结晶相关的由二甲苯、TOL和BEN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 multicomponent systems composed of xylene(including p-xylene(PX),m-xylene(MX)and o-xylene(OX)),toluene(TOL)and benzene(BEN)related to the crystallization of PX,a solid-liquid phase equilibrium calculation model,namely simplified Van′t Hoff equation,was selected to predict the solid-liquid phase equilibrium data of PX-TOL-BEN,MX-TOL-BEN,and OX-TOL-BEN ternary systems,PX-MX-TOL-BEN,PX-OX-TOL-BEN,MX-OX-TOL-BEN,and PX-MX-OX-TOL quaternary,systems and PX-MX-OX-TOL-BEN quinary systems.The results showed that the simplified Van′t Hoff equation was applicable to the calculation of ternary,quaternary,and quinary solid-liquid phase equilibrium systems composed of xylene,TOL,and BEN components related to PX crystallization in PX plants;the solid-liquid phase equilibrium data of ternary,quaternary,and quinary systems can be used to draw solid-liquid phase equilibrium diagrams,providing theoretical guidance and basis for the measurement of solid-liquid phase equilibrium data and related research,design and simulation optimization of PX crystallization systems composed of xylene,TOL,and BEN components.

关 键 词：二甲苯 甲苯 苯 固液相平衡 液相摩尔分数 低共熔点 

分 类 号：TQ241.1[化学工程—有机化工]