Insight into the green route to dimethyl succinate by direct esterification of bio-based disodium succinate using CO_(2)and CH_(3)OH  

作　　者：Yu-Gao Wang Xiao-Chen Han Bao Gu Hua-Shuai Wu Jun Shen 

机构地区：[1]School of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第12期188-195,共8页中国化学工程学报（英文版）

基　　金：Natural Science Foundation of Shanxi Province(202203021221069 and 202103021223063);National Natural Science Foundation of China(21706172).

摘　　要：The fermentation for succinic acid production outperforms other methods by low energy consumption and environmental benignity,with the resulting products mainly as disodium succinate(DSA).By directly esterifying DSA using CO_(2) and CH3OH,it is expected to avoid the use of inorganic acids.By high-resolution mass spectrometry analysis and theoretical calculation,this study establishes that the reaction consists of three steps,i.e.,first forming 3-carboxypropanoate,then monomethyl succinate(MMS),and finally dimethyl succinate(DMS).A detailed kinetic analysis is further performed,the results demonstrate that the transformation of DSA to MMS is regarded to be a second-order reaction for reactant DSA,while the transformation of MMS to DMS is a first-order reaction for reactant MMS.The activation energy for the generation of MMS from DSA is 37.15 kJ·mol^(-1),and that for the generation of DMS from MMS is 85.80 kJ·mol^(-1),indicating the latter one is the rate-determining step.

关 键 词：SUCCINATE Carbon dioxide Direct esterification Reaction mechanism Reaction kinetics Kinetic modeling 

分 类 号：TQ225.24[化学工程—有机化工]