Kinetic Study of Esterification of Lactic Acid with Isobutanol and n-Butanol Catalyzed by Ion-exchange Resins  

作　　者：屈一新 彭少君 王水 张志强 王际东 

机构地区：[1]Beijing Key Laboratory of Bioprocess, Department of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

出　　处：《Chinese Journal of Chemical Engineering》2009年第5期773-780,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Basic Research Program of China (2007CB714300)

摘　　要：The esterification reactions of lactic acid with isobutanol and n-butanol have been studied in the presence of acid ion-exchange resin Weblyst D009. The influences of catalyst loading, stirrer speed, catalyst particle size, initial reactant molar ratio and temperature on the reaction rate have been examined. Experimental kinetic data were correlated by using the pseudo-homogeneous, Langnluir-Hinshelwood and Eley-Rideal models. Nonideality of the liquid phase was taken into account by using activities instead of molar fractions. The activity coefficients were calculated according to the group contribution method UNIFAC. Provided that the nonideality of the liquid is taken into account, the esterification kinetics of lactic acid with isobutanol and n-butanol catalyzed by the acid ion-exchange resin can be described using all threemodels with reasonable errors.The esterification reactions of lactic acid with isobutanol and n-butanol have been studied in the presence of acid ion-exchange resin Weblyst D009.The influences of catalyst loading,stirrer speed,catalyst particle size,initial reactant molar ratio and temperature on the reaction rate have been examined.Experimental kinetic data were correlated by using the Pseudo-homogeneous,Langmuir-Hinshelwood and Eley-Rideal models.Nonideality of the liquid phase was taken into account by using activities instead of molar fractions.The activity coefficients were calculated according to the group contribution method UNIFAC.Provided that the nonideality of the liquid is taken into account,the esterification kinetics of lactic acid with isobutanol and n-butanol catalyzed by the acid ion-exchange resin can be described using all three models with reasonable errors.

关 键 词：KINETICS ESTERIFICATION lactic acid ISOBUTANOL N-BUTANOL ion exchange resin 

分 类 号：TQ425.23[化学工程] O623.624[理学—有机化学]