苯甲酸在含夹带剂超临界CO_2中溶解度研究  

Study on the Solubility of Benzoic Acid in Supercritical CO_2 with Cosolvent

作　　者：金君素[1] 张泽廷[1] 李颖[1] 于恩平[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《北京工业大学学报》2006年第3期235-239,共5页Journal of Beijing University of Technology

基　　金：教育部科学研究重点项目(00017).

摘　　要：为了给超临界萃取技术工业化设计提供基础数据,用流动法测定了苯甲酸在35．0、45．0、55．0℃,8．0 -23．0 MPa条件下,在超临界CO2和含乙酸乙酯(C4H8O2)、乙醇(C2H6O)或C4HBO2+C2H6O(摩尔比为1:1)夹带剂的超临界CO2中的溶解度数据,夹带剂的摩尔分数为0．02．分析了温度和压力对溶解度的影响及各种夹带剂的效应和作用机理．用改进的chrastil方程和化学缔合模型分别关联实验数据,计算值与实验值的平均相对偏差为7．56％和4．83％．In order to provide fundamental data for the industrial design of the supercritical fluid extraction, the solubility of benzoic acid was measured in supercritical carbon dioxide without and with cosolvents at the mole fraction of 0.02（ethyl acetate, ethanol or ethyl acetate plus ethanol （molar ratio 1：l））, at the temperature of 35.0, 45.0, 55.0 degrees centigrade and under pressure from 8.0 to 23.0 Mpa, by using a flow-type phase equilibrium apparatus. This article analyzed the influence of temperature and pressure on solubility, the effects of the cosolvents and the mechanism, and then correlated the measuring results with a modified Chrastil equation and a chemical association model respectively. The average relative deviation between calculated values and test results was 7.56 % and 4.83 % respectively.

关 键 词：超临界CO2苯甲酸(C7H6O2) 夹带剂 溶解度 

分 类 号：TQ013.1[化学工程]