苯甲酸在含不同夹带剂的超临界CO_2中的溶解度  

Solubility of Benzoic Acid in Supercritical Carbon Dioxide with Different Cosolvents

作　　者：李颖[1] 石冰洁[1] 张泽廷[1] 金君素[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：《过程工程学报》2005年第3期265-268,共4页The Chinese Journal of Process Engineering

基　　金：教育部科学研究重点资助项目(编号:00017)

摘　　要：利用流动法分别测定了苯甲酸在温度308.15, 318.15, 328.15 K、压力范围8.0~23.0 MPa时,在纯超临界CO2及以乙醇、乙酸乙酯、乙二醇为夹带剂的超临界CO2中的溶解度. 研究结果表明,三种夹带剂的加入均可以不同程度地提高苯甲酸的溶解度,其增大幅度为乙醇>乙二醇>乙酸乙酯. 此外还探讨了温度、压力对苯甲酸在超临界CO2中溶解度的影响,以及夹带剂的作用机理,并用Sovova方程对实验数据进行回归,得到了较满意的结果.The solubility of benzoic acid in supercritical carbon dioxide with or without ethanol, ethyl acetate, ethylene glycol as cosolvent were measured at temperatures of 308.15, 318.15 and 328.15 K and pressures from 8.0 to 23.0 MPa respectively. It is revealed that the cosolvents added into the supercritical carbon dioxide could enhance the solubility of benzoic acid remarkably, and the effects of the three kinds of cosolvents were different. The enhancement degree of solubility by the cosolvents is ranked with the order: ethanol>ethylene glycol>ethyl acetate. In addition, the effects of temperature, pressure and cosolvent on the solubility were also discussed. The measured data of the solubility of benzoic acid in supercritical carbon dioxide were correlated with those calculated with the Sovova equation.

关 键 词：苯甲酸 超临界CO2 溶解度 夹带剂 

分 类 号：TQ245.12[化学工程—有机化工]