关键词: 对二甲苯, 结晶, 固液相平衡, 低共熔点温度, 甲苯, C₈芳烃, 熔融结晶

Abstract: The calculation model and parameters of solid-liquid phase equilibrium for p-xylene crystallization related binary and above systems were selected. Based on the experimental data of liquid phase mole fraction of several binary systems containing p-xylene and eutectic point temperatures and compositions of binary, ternary and quaternary systems composed by C₈ aromatic components, the calculation models were investigated, and the calculated results of the model were in good agreement with the experimental data. The results showed that the model and parameters were suitable for the calculation of solid-liquid phase equilibrium of p-xylene crystallization related binary and above systems. Using this model, the eutectic point temperatures and compositions of binary, ternary, quaternary and quinary systems composed by toluene and C₈ aromatics components were calculated. The principle of melt crystallization technology was explained on the solid-liquid phase diagram of p-xylene and m-xylene binary system based on the calculation results of the model.

Key words: p-xylene, crystallization, solid-liquid phase equilibrium, eutectic point temperature, toluene, C₈ aromatics, melt crystallization