Synthesis, isolation and characterization of methyl levulinate from cellulose catalyzed by extremely low concentration acid

作     者：Hui Li Lincai Peng Lu Lin Keli Chen Heng Zhang 

作者机构：Faculty of Chemical Engineering Kunming University of Science and Technology State Key Laboratory of Pulp and Paper Engineering South China University of Technology School of Energy Research Xiamen University 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2013年第22卷第6期

页      面：895-901页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 081705[工学-工业催化] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：supported by the National Key Basic Research Program (2010CB732201) from the Ministry of Science and Technology of China the State Key Laboratory Open Foundation of Pulp and Paper Engineering of China (201225) 

主　　题：cellulose methyl levulinate extremely low acid catalysis alcoholysis isolation 

摘      要：A direct synthesis of methyl levulinate from cellulose alcoholysis in methanol medium under mild condition(180 210 C)catalyzed by extremely low concentration sulfuric acid(0.01 mol/L)and the product isolation were developed in this *** of different process variables towards the catalytic performance were performed as a function of reaction *** results indicated that sulfuric acid concentration,temperature and initial cellulose concentration had significant effects on the synthesis of methyl *** optimized yield of around 50%was achieved at 210 C for 120 min with sulfuric acid concentration of 0.01 mol/L and initial cellulose concentration below 100 g/*** resulting product mixture was isolated by a distillation technique that combines an atmospheric distillation with a vacuum distillation where n-dodecane was added to help distill the heavy *** light fraction including mainly methanol could be reused as the reaction medium without any substantial change in the yield of methyl *** chemical composition and structural of lower heavy fraction were characterized by GC/MS,FTIR,1H-NMR and13C-NMR *** levulinate was found to be a major ingredient of lower heavy fraction with the content over 96%.This pathway is efficient,environmentally benign and economical for the production of pure levulinate esters from cellulose.