化工学报2025，Vol.76Issue(5)：2241-2250,10.DOI:10.11949/0438-1157.20241262
CuAlCl4-二甲苯络合物晶体结构及二元固液相平衡测定
Crystal structure of xylene·CuAlCl4 and measurement of solid-liquid equilibrium of binary system
摘要
Abstract
Para-xylene(PX)is an important basic chemical raw material.The separation of PX from mixed xylenes(mixture of meta-xylene(MX),ortho-xylene(OX),and PX)is a prerequisite for its utilization.The complex crystallization method,combining complexation with crystallization,has great potential for separating PX from mixed xylenes.Three new crystals including 2PX·CuAlCl4,2MX·CuAlCl4,and 2OX·CuAlCl4 were obtained by complexing the bimetallic halide CuAlCl4 with xylene isomers by π-complexation as a complexing agent.The melting points of these crystals were 41.0℃,15.1℃and 55.7℃,respectively.The solid-liquid equilibrium data of the binary systems 2PX·CuAlCl4/2MX·CuAlCl4 and 2PX·CuAlCl4/2OX·CuAlCl4 were further determined.Both were simple eutectic systems.The mole fraction of 2PX·CuAlCl4 at the eutectic point was 0.3969 and 0.6107,and the corresponding temperatures were-3.36℃and 14.83℃,which were 49.2℃and 47.7℃higher than those of the pure arene binary system,respectively.The temperature required for the crystallization operation was greatly increased.The phase equilibrium data were fitted by the ideal solution model,and the results showed that the model could be used to relate the solid-liquid phase equilibrium of the binary system.This provided a thermodynamic basis for the separation of mixed xylenes by bimetallic halide complex crystallization.A purity of 98％PX was obtained through initial crystallization,verifying the feasibility of the method.关键词
双金属卤化物/对二甲苯/π络合/络合结晶/固液相图Key words
bimetallic halides/para-xylene/π complexation/complex crystallization/solid-liquid phase diagram分类
化学化工引用本文复制引用
刘晗,崔家馨,殷梦凡,郑涛,张睿,孟祥海,刘植昌,刘海燕,徐春明..CuAlCl4-二甲苯络合物晶体结构及二元固液相平衡测定[J].化工学报,2025,76(5):2241-2250,10.基金项目
国家自然科学基金项目(22021004,22078359) （22021004,22078359）
