Esterification of levulinic acid into n-butyl levulinate catalyzed by sulfonic acid-functionalized lignin-montmorillonite complex  

作　　者：Wenguang Zhao Hui Ding Jie Zhu Xianxiang Liu Qiong Xu Dulin Yin 

机构地区：[1]National&Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources,College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,China

出　　处：《Journal of Bioresources and Bioproducts》2020年第4期291-299,共9页生物质资源与工程（英文）

基　　金：the financial support of the National Natural Science Foundation of China(Nos.21606082,21776068 and 21975070);Hunan Provincial Natural Science Foundation of China(No.2018JJ3334),and China Postdoctoral Science Foundation(No.2019M662787).

摘　　要：In this study,sulfonic acid-functionalized lignin-montmorillonite complex(LMT-SO_(3)H)was pre-pared and employed as an efficient heterogeneous catalyst for the esterification of levulinic acid(LA)into n-butyl levulinate(BL).An intermediate pseudo-butyl levulinate(p-BL)was determined by distilled water treatment and nuclear magnetic resonance(NMR)analysis,and a possible mech-anism for the esterification of LA is proposed.The effects of various process parameters were studied and the results showed that the LMT-SO_(3)H catalyst had the excellent catalytic perfor-mance for esterification of the LA.Under optimum reaction conditions,the yield of BL was 99.3%and the conversion of LA was 99.8%.The LMT-SO_(3)H catalyst exhibited strong acidic sites and high stability even after seven cycles of usage.Furthermore,esterification of the LA with various alcohols over the LMT-SO_(3)H was further investigated.

关 键 词：Levulinic acid Solid sulfonic acid n-Butyl levulinate ESTERIFICATION Heterogeneous catalysis 

分 类 号：O64[理学—物理化学]