对二甲苯结晶相关多元体系的固液相平衡数据预测  

Prediction of solid-liquid equilibrium data for p-xylene crystallization related 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》2023年第6期49-54,共6页China Synthetic Fiber Industry

摘　　要：针对与对二甲苯结晶相关的由苯、甲苯和碳八(C_(8))芳烃组分组成的多元体系,选取了固液相平衡计算模型—Van′t Hoff方程简式,利用由苯、甲苯和C_(8)芳烃组分组成的二元和三元体系固液相平衡文献值对模型进行考察,并利用该模型预测了对二甲苯-间二甲苯-邻二甲苯-乙苯四元体系、对二甲苯-间二甲苯-邻二甲苯-苯四元体系、对二甲苯-间二甲苯-邻二甲苯-乙苯-甲苯五元体系、对二甲苯-间二甲苯-邻二甲苯-乙苯-苯五元体系和对二甲苯-间二甲苯-邻二甲苯-乙苯-甲苯-苯六元体系,以及较低温度下对二甲苯-间二甲苯-邻二甲苯三元体系的固液相平衡数据。结果表明:采用Van′t Hoff方程简式计算,由苯、甲苯和C_(8)芳烃组分组成二元体系的液相摩尔分数的平均相对偏差为2.72%,低共熔点温度的偏差最高为0.59℃,最低为0.01℃,表明所选模型适用于由苯、甲苯和C_(8)芳烃组分组成的体系固液相平衡计算;利用Van′t Hoff方程简式预测的固液相平衡数据可为由苯、甲苯和C_(8)芳烃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。For the multicomponent systems related to the crystallization of p-xylene,which are composed of benzene,toluene and C_(8) aromatic hydrocarbons,a solid-liquid equilibrium calculation model,simplified Van′t Hoff equation,was investigated based on the solid-liquid equilibrium literature values of binary and ternary systems composed of benzene,toluene,and C_(8) aromatic hydrocarbons.And the model was used to predict the solid-liquid equilibrium data of the quaternary systems of p-xylene-m-xylene-o-xylene-ethylbenzene and p-xylene-m-xylene-o-xylene-benzene,the quinary systems of p-xylene-m-xylene-o-xylene-ethylbenzene-toluene and p-xylene-m-xylene-o-xylene-ethylbenzene-benzene and the hexanavy system of p-xylene-m-xylene-o-xylene-ethylbenzene-toluene-benzene and the data of p-xylene-m-xylene-o-xylene ternary system at relatively low temperatures.The results showed that the average relative deviation of the liquid phase mole fraction of the binary system composed of benzene,toluene and C_(8) aromatics was calculated as 2.72%and the maximum deviation of eutectic point as 0.59℃and the minimum value as 0.01℃according to the simplified Van′t Hoff equation,indicating that the selected model was suitable for solid-liquid phase equilibrium calculations of systems composed of benzene,toluene and C_(8) aromatic hydrocarbons;and the solid-liquid equilibrium data predicted according to the simplified Van′t Hoff equation can provide theoretical guidance for the measurement of solid-liquid equilibrium data and the related research,design and simulation optimization of the systems composed of benzene,toluene and C_(8) aromatic hydrocarbons.

关 键 词：对二甲苯 甲苯 苯 固液相平衡 液相摩尔分数 数据预测 

分 类 号：TQ241.1[化学工程—有机化工]