文献类型：期刊文献

英文题名：Kinetics of the esterification between lactic acid and isoamyl alcohol in the presence of silica gel-supported sodium hydrogen sulphate

作者：Jiang, Zhongkai[1];Xu, Jumei[1];Zeng, Zuoxiang[1];Xue, Weilan[1];Li, Shating[1]

机构：[1]East China Univ Sci & Technol, Inst Chem Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：96

期号：9

起止页码：1972

外文期刊名：CANADIAN JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20180804810664);WOS:【SCI-EXPANDED(收录号:WOS:000440933500014)】；

语种：英文

外文关键词：lactic acid; isoamyl lactate; esterification; dynamic model; sodium hydrogen sulphate

摘要：The esterification reaction between isoamyl alcohol and lactic acid was studied over silica gel-supported sodium hydrogen sulphate (NaHSO(4)Silica). The influences of the external mass transfer, internal mass transfer, reaction temperature, catalyst loading, and initial reactant molar ratio were investigated. Kinetic experimental data of this esterification reaction obtained at different temperatures (343-378 K) were correlated with three models (the pseudo-homogeneous (PH), Eley-Rideal (ER), and Langmuir-Hinshelwood (LH) model). The UNIFAC method was employed to estimate the activity coefficients when the non-ideal thermodynamic behaviour of the reaction mixture was considered. The results show that the ER model is more appropriate for predicting the dynamic data of an esterification reaction. It was found that water and isoamyl alcohol were more strongly adsorbed onto the surface of NaHSO(4)Silica than lactic acid and isoamyl lactate, by comparing the adsorption equilibrium constants of different components existing in the reaction. The activation energy and standard enthalpy of the reaction were found to be 54.1 and -6.27 kJ mol(-1), respectively.