Preliminary Optimization and Kinetics of SnCl_(2)-HCl Catalyzed Hydrothermal Conversion of Microcrystalline Cellulose to Levulinic Acid

作     者：Dexby de Guzman Rizalinda de Leon 

作者机构：FuelsEnergy and Thermal Systems LaboratoryDepartment of Chemical EngineeringUniversity of the PhilippinesQuezon City1101Philippines 

出 版 物：《Journal of Renewable Materials》 (可再生材料杂志（英文）)

年 卷 期：2021年第9卷第1期

页      面：145-162页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：Department of Science and Technology Engineering Research and Development for Technology Republic of the Philippines Department of Science and Technology, Ministry of Science and Technology, India, डीएसटी Department of Science and Technology, Republic of the Philippines, DOST 

主　　题：Levulinic acid tin(II)chloride cellulose optimization kinetics 

摘      要：Levulinic acid(LA)is a platform biorefinery chemical from biomass which can be converted to green solvents,plasticizers,polymer precursors,biobased cleaning agents,fuels and fuel *** study assessed the potential of SnCl_(2)-based mixed acid systems as catalyst in the hydrothermal conversion of microcrystalline cellulose to levulinic *** LAyield of 36.2 mol%was achieved using 0.2 M SnCl_(2) concentration at test conditions of 3 h,180℃ and 1%w/v cellulose *** reduce precipitate formation and further improve LA yield,the strategy employed was to combine SnCl_(2)(a Lewis acid)with conventional mineral acids(Bronsted acids).Evaluation of the catalytic performance of SnCl_(2)-HCl,SnCl_(2)-H_(2)SO_(4),SnCl_(2)-HNO_(3),and SnCl_(2)-H_(3)PO_(4)(1:1 molar ratio,0.2 M total acid concentration)were done with highest LA yield of 47.0 mol%obtained using the SnCl_(2)-HCl system at same test *** surface methodology optimization employing Box-Behnken design generated a quadratic model with a high coefficient of determination(r2)of 0.964.A maximum LA yield of 63.5 mol%can be achieved at 0.17 M catalyst concentration,198℃,and 5.15 h reaction *** constants were estimated using nonlinear regression,while activation energies were determined using Arrhenius *** hydrolysis was determined to be the rate-limiting step in the overall *** activation energy of 63.3 kJ/mol for glucose dehydration to hydroxymethylfurfural supports the action of SnCl_(2) as Lewis acid in the mixed-acid *** yield simulations for plug flow reactor(PFR)and continuous stirred tank reactor(CSTR)were done suggesting a similar PFR-CSTR configuration with the established Biofine ***,a reaction scheme was presented to explain the synergy between SnCl_(2) and HCl in LA production from cellulose.