H_6P_2W_(18)O_(62)/SiO_2催化绿色合成乙酸正丁酯  

Catalytic synthesis of n-Butyl acetate with H6P2W18O62/SiO2

作　　者：曹小华[1,2] 陶春元[2] 任杰[1] 蓝珍珍[2] 谢宝华[2] 

机构地区：[1]浙江工业大学化工与材料学院,杭州310014 [2]九江学院化学化工学院,九江332005

出　　处：《食品科技》2011年第10期214-218,共5页Food Science and Technology

基　　金：江西省自然科学基金(2009GQH0053);江西省教育厅科技资助项目(GJJ10626;GJJ11613);九江学院重点科技资助项目(09KJ4);九江学院质量工程项目(09XSCXXSY25;09XSCXXSY62)

摘　　要：用SiO2为载体,通过溶胶凝胶法制备了H6P2W18O62/SiO2催化剂,以乙酸和正丁醇为原料合成了乙酸正丁酯。考察了磷钨酸负载量、催化剂用量、醇酸比、反应时间和反应温度对反应的影响,并提出可能的催化机理。结果表明,最优的反应条件为:负载量为25%,催化剂用量1.12%(按反应体系总质量计算),醇酸比2.0:1.2,反应时间2h,反应温度120℃,在此条件下酯化率可达95.30%。催化重复使用5次,酯化率仍可达63.24%Phosphotungstics acid with Dawson structure（P2W18） supported on SiO2 were prepared by the sol-gel method.The catalytic performance in synthesis of n-Butyl acetate with acetic acid and n-butanol was investigated and the mechanism was discussed.The optimized condition were as follows：the supported quantity is 25%,the mass ratio of the catalyst to total reactant was 1.12%,the molar ratio of n-butyl alcohol to acetic acid was 2.0：1.2,the reaction time was 2 hours,the reaction temperature was 120 ℃.Yield of n-Butyl acetat could reach 95.30% under the optimum conditions.The catalyst could be reused for 5 times and the isolated of adipic acid was still above 63.24%.

关 键 词：H6P2W18O62/SiO2 乙酸正丁酯 酯化反应 

分 类 号：O623.624[理学—有机化学]