离子液体萃取红霉素的热力学机理研究  

Thermodynamic Mechanism of Extraction of Erythromycin in Ionic Liquid Aqueous Two-phase System

作　　者：李宇亮[1] 李宏颖[1] 张梦诗[1] 

机构地区：[1]长安大学环境科学与工程学院,西安710054

出　　处：《世界科技研究与发展》2013年第2期228-229,233,共3页World Sci-Tech R&D

基　　金：国家自然科学基金(20777029);教育部博士点基金项目(200807100004);中央高校基本科研业务费专项资金(CHD2011JC094;CHD2012JC063)资助

摘　　要：以亲水性离子液体双水相体系[Emim]BF_4/NaH_2PO_4萃取红霉素为研究对象,旨在探究萃取过程的热力学机理;计算出摩尔反应配比和萃取平衡常数;通过Arrhenius方程和Van't Hoff方程分别计算出基本的热力学函数值△日、△G及△S。结果表明,该体系在室温下,K_(ex)为2.63×10~6,m为1.5;相应的热力学数据分别为△H=42.93 kJ·mol^(-1)、△G=-3.754 kJ·mol^(-1)、△S=129.24 J·(K·mol)^(-1);△G为负值表明萃取过程可以自发的进行,△S为正值表明红霉素从水相到离子液体相的迁移是一个可以自发进行的过程。The thermodynamic mechanism of erythromycin in liquid aqueous two-phase system（ [Emim] BF4/ NaH2PO4） was studied. The effects of temperature, time, pH were investigated on the rate of erythromycin extraction. The molar reaction ratio and the extraction equilibrium constant were calculated. The basic thermodynamie functions △H, △G, and △S were calculated by the Arrhenius equation and Van＇t Hoff equation. The results show that, at room temperature and slightly acidic conditions, △G being negative value indicates that the extraction process ean be spontaneous, and AS for the positive value indicates that erythromyein is a spontaneous process of migration from the aqueous phase to ionic liquids.

关 键 词：离子液体 红霉素 萃取 热力学 机理 

分 类 号：TS207.3[轻工技术与工程—食品科学]