近临界甲醇中稀硫酸催化葡萄糖醇解反应动力学  

Alcoholysis kinetics of glucose catalyzed by dilute sulfuric acid in near-critical methanol

作　　者：吴晓宇[1] 吕秀阳[1] 陈天[1] 陈樟女[1] 

机构地区：[1]浙江大学化学工程与生物工程学系,浙江杭州310027

出　　处：《化工学报》2010年第10期2585-2589,共5页CIESC Journal

基　　金：浙江省自然科学基金项目(R4080110);国家自然科学基金项目(20976160)~~

摘　　要：In order to explore the feasibility of one-pot preparation of methyl levulinate (MLA)from biomass catalyzed by dilute sulfuric acid in near-critical methanol,the kinetics of MLA production were investigated at initial glucose concentration of 10—30 mg·ml-1,temperature range from 160 ℃ to 190 ℃,and sulfuric acid concentration between 0.01—0.06 mol·L-1.The results show that reaction temperature has a significant effect on the selectivity of MLA and higher yield of MLA is obtained at higher temperature.With the first-order kinetic equations,the activation energies evaluated are 107.5 kJ·mol-1 and 68.4 kJ·mol-1,and the reaction orders to H+ concentration are 0.981 and 0.953 for main and side alcoholysis reactions of glucose,respectively.The paper demonstrates that the one-pot process is promising for MLA production catalyzed by dilute sulfuric acid in near-critical methanol.In order to explore the feasibility of one-pot preparation of methyl levulinate （MLA）from biomass catalyzed by dilute sulfuric acid in near-critical methanol,the kinetics of MLA production were investigated at initial glucose concentration of 10—30 mg·ml-1,temperature range from 160 ℃ to 190 ℃,and sulfuric acid concentration between 0.01—0.06 mol·L-1.The results show that reaction temperature has a significant effect on the selectivity of MLA and higher yield of MLA is obtained at higher temperature.With the first-order kinetic equations,the activation energies evaluated are 107.5 kJ·mol-1 and 68.4 kJ·mol-1,and the reaction orders to H＋ concentration are 0.981 and 0.953 for main and side alcoholysis reactions of glucose,respectively.The paper demonstrates that the one-pot process is promising for MLA production catalyzed by dilute sulfuric acid in near-critical methanol.

关 键 词：葡萄糖 乙酰丙酸甲酯 近临界甲醇 醇解 动力学 

分 类 号：TQ032[化学工程]