Prediction of solid-liquid phase equilibrium data for p-xylene crystallization related ternary and quaternary systems
For the ternary and quaternary solid-liquid phase equilibrium systems related to the crystallization of p-xylene,which are composed of benzene,toluene and C8 aromatic hydrocarbons,a solid-liquid phase equilibrium calculation model,namely sim-plified Van't Hoff equation was selected to predict the solid-liquid phase equilibrium data of the ternary systems of p-xylene-ethyl-benzene-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-xy-lene-ethylbenzene-benzene and m-xylene-o-xylene-ethylbenzene-benzene.The results showed that the simplified Van't Hoff equa-tion is applicable to the calculation of the ternary and quaternary solid-liquid phase equilibrium systems composed of C8 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 crys-tallization related systems composed of C8 aromatic hydrocarbons,toluene and benzene.
xyleneethylbenzenetoluenebenzenesolid-liquid phase equilibriumeutectic point
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