三元体系K2SO4-PEG1000-H2O(288,298,308)K相平衡测定及计算  

Phase equilibrium measurements and simulation of the ternary system K2SO4-PEG1000-H2O at T=(288,298,and 308)K

作　　者：郑洪 王林[1] 李茂兰 黄琴 昝小航 赖俊华 于旭东[1,2] ZHENG Hong;WANG Lin;LI Mao-lan;HUANG Qin;ZAN Xiao-hang;LAI Jun-hua;YU Xu-dong(College of Materials and Chemistry&Chemical Engineering,Chengdu University of Technology,Chengdu 610059,China;Collaborative Innovation Center of Panxi Strategic Mineral Resources Multi-Purpose Utilization,Chengdu 610059,China)

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059 [2]四川省攀西战略矿产资源综合利用协同创新中心,四川成都610059

出　　处：《高校化学工程学报》2020年第2期552-557,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(U1507111)。

摘　　要：为了获取K2SO4在聚乙二醇(PEG1000)-水混合溶剂中的溶解行为,采用等温溶解平衡法测定(288,298,308)K下三元体系K2SO4-PEG1000-H2O的平衡溶解度、密度和折光率,并绘制了相应的相图、密度-组成图和折光率-组成图。研究发现:随温度变化,相图结构发生了变化。当温度为288和298 K时平衡相图由不饱和液相区(L)、一固一液区(S+L)和两固一液区(2S+L)构成;当温度为308 K时平衡相图由不饱和液相区(L)、一固一液区(S+L)构成。随着溶液中PEG1000含量不断增加,K2SO4溶解度减小,温度对盐析率影响较小。采用修正后的Pitzer模型对该体系溶解度进行了理论计算,计算发现:实验数据和计算数据吻合较好。In order to obtain solubility data of K2SO4 in Polyethylene glycol 1000(PEG1000)-H2 O mixed solvents,the solubility,density,and refractive index of the ternary system K2SO4-PEG1000-H2O at(288,298,and 308)K were investigated by an isothermal dissolution method.The corresponding phase diagrams,and diagrams of density-composition and refractive index-composition were obtained based on the experimental data.The results show that the phase diagrams change with temperature.The phase diagram consists of one homogeneous area with unsaturated liquid phase(L),one saturated liquid phase and one equilibrium area containing the solid phase of K2SO4(L+S),one area with one liquid phase and two solid phase(2S+L)at 288 K and 298 K,while there were only one homogeneous area with unsaturated liquid phase(L),one saturated liquid phase and one equilibrium area containing the solid phase of K2 SO4(L+S)at 308 K.The solubility of K2SO4 decreased with the addition of PEG1000.The temperature had little effect on the salting-out ratio.The solubility of K2SO4-PEG1000-H2O at(288,298,and 308)K were calculated by the modified Pitzer model.The results show that the calculated solubility agrees well with the experimental value.

关 键 词：相平衡 溶解度 混合溶剂 硫酸钾 PITZER方程 

分 类 号：O642[理学—物理化学]