含夹带剂的超临界流体中固体溶解度的研究  

Study on Solid Solute Solubility in Supercritical Fluids with Cosolvent

作　　者：金君素[1] 李群生[1] 张泽廷[1] 姚晓敏[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：《石油化工》2004年第5期441-446,共6页Petrochemical Technology

基　　金：教育部科学研究重点项目(00017)。

摘　　要：将超临界流体视为膨胀液体,根据溶液理论,建立了计算溶质在超临界流体中溶解度的膨胀液体模型。该模型迭代速度快,需要的物性参数少。用流动法测定了2-羟基苯甲酸在温度308.15,328.15 K、压力10.0,13.0,16.0,20.0,24.0 MPa条件下,在超临界CO2中及有夹带剂环己烷、乙醇存在时的溶解度数据。用实验数据和文献数据对膨胀液体模型的适用性进行了验算,实验数据及文献数据的平均相对偏差分别为3.55％,3.78％,而Chrastil模型和Wilson方程的计算偏差分别为10.86％(模拟实验数据)和5.59％(模拟文献数据)。An expanded liquid model (ELM) for solid solute solubility in supercritical fluids was proposed based on the assumption that the supercritical fluid was considered as an expanded liquid. The solubility of 2 -hydroxybenzoic acid was measured in supercritical carbon dioxide with and without cosolvents, such as cyclohexane and ethanol,within a temperature range of 308.15-328.15 K,and a pressure range of 10.0-24.0 MPa,by flow method. The expanded liquid model was used to calculate experimental and literature data. The results showed that the ARD were 3.55 % and 3.78 % , while the ARD from Chrastil Model and Wilson Equation were 10.86 % and 5.59%. Moreover, the expanded liquid model has the advantage of rapid iterative speed and fewer physical parameters needed.

关 键 词：超临界流体 膨胀液体模型 固体溶解度 

分 类 号：TQ013.1[化学工程]