含夹带剂的超临界流体中固体溶解度的研究

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)。

Study on Solid Solute Solubility in Supercritical Fluids with Cosolvent

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.