Abstract: In the p-xylene crystallization related system, for the multi-component system where toluene and ethylbenzene with very close normal melting points exist at the same time, the solid-liquid phase equilibrium calculation model - Van′tHoff equation simplification is used to predict the ethylbenzene·toluene·benzene ternary system, and the solid-liquid phase equilibrium data of p-xylene·ethylbenzene·toluene·benzene, m-xylene·ethylbenzene·toluene·benzene, o-xylene·ethylbenzene·toluene·benzene and m-xylene·o-xylene·ethylbenzene·toluene multi-component systems are predicted. These new phase equilibrium data have not been reported in the literature and can provide a theoretical basis and guidance for the solid-liquid phase equilibrium research of p-xylene crystallization related systems.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">toluene, C8 aromatics, benzene, multi-component system, solid-liquid phase equilibrium, p-xylene, Van′tHoff equation, eutectic point

摘要： 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′tHoff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。

关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">甲苯, C8芳烃, 苯, 多元体系, 固液相平衡, 二甲苯, Van′tHoff方程, 低共熔点