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邻、对甲酚与对二甲苯固液平衡 预览 被引量:1

Solid-Liquid Equilibrium of o-or p-Cresol with p-Xylene
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摘要 为结晶提纯邻甲酚和对甲酚,采用差示扫描量热法测定了邻甲酚和对甲酚分别与对二甲苯二元固液平衡数据,同时绘制出相应的简单低共熔型二元相图.低共熔组成和温度为:邻甲酚(x)+对二甲苯(1-x),x=0.420 5,T=271.82 K;对甲酚(x)+对二甲苯(1-x),x=0.459 8,T=272.52 K.采用Ott方程对固液平衡数据进行关联,温度标准偏差不大于0.8 K;根据固液平衡热力学基本关系,应用UNIFAC基团贡献法计算溶液活度系数,所得固液平衡计算值和实验值比较接近,说明UNIFAC法对以上体系是适用的. For purifying o-cresol and p-cresol by crystallization, the solid-liquid equilibrium data for binary mixtures of o-cresol,or p-cresol with p-xylene were determined by differential scanning calorimetry (DSC) and their corresponding eutectic type phase diagrams were presented. The eutectics were at x=0.420 5, T=(271.82 K) in x o-cresol + (1-x) p-xylene and x=0.459 8, T=272.52 K in x p-cresol+(1-x)p-xylene.The solid-liquid equilibrium data were fitted by Ott′s equation and the temperature square deviations were not greater than 0.8 K. Thermodynamics of solid-liquid equilibrium, coupled with the universal quasi-chemical functional group activity coefficient (UNIFAC) group-contribution method for activity coefficients,enables good estimates for the above systems.
作者 魏东炜 闫峰 张文想 马海洪 WEI Dong-wei~1, YAN Feng~1, ZHANG Wen-xiang~2, MA Hai-hong~1 (1.Research and Development Center for Petrochemical Technology, Tianjin University,Tianjin 300072,China; 2.Resin Application Research Institute,Beijing Yanshan Petrochemical Limited Company, Beijing 102500,China)
出处 《天津大学学报:自然科学与工程技术版》 EI CAS CSCD 北大核心 2005年第2期 167-170,共4页
关键词 固液平衡 对甲酚 邻甲酚 对二甲苯 差示扫描量热法 solid-liquid equilibrium p-cresol o-cresol p-xylene differential scanning calorimetry
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