Preparation of ethyl levulinate from cellulose alcoholysis catalyzed by extremely acid
Ethyl levulinate(EL)is a highly promising biomass fuel and additive,and the production of EL using yield-rich biomass is beneficial to the industrialized large-scale production of EL.In this article,we studied the effects of sulfuric acid dosage,reaction time,reaction temperature and substrate concentration on the yield of EL using ultra-low concentration sulfuric acid catalyzed cellulose,and optimized the EL production process by using response surface Box-Behnken model to study the effects of various factors on the yield of EL,and obtained the optimal process conditions for EL production from ultra-low concentration sulfuric acid catalyzed cellulose:sulfuric acid dosage 0.5%,reaction temperature 204℃,reaction time 240 min,substrate concentration 29 g/L reaction,the actual average yield of EL was 66.70%,with a relative error of 3.25%from the theoretical prediction.GC-MS analyzed the distribution of alcoholysis products of ultra-low concentration sulfuric acid-catalyzed cellulose under different reaction times,and proposed possible reaction pathways,the results of which can provide reference and reference for the alcoholysis conversion of cellulosic biomass.
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