活性炭负载SiW_(12)杂多酸催化合成乙酸异丙酯.  

Synthesis of isopropyl acetate catalyzed by SiW_(12) heteropolyacid supported on activated carbon

作　　者：王学丽[1] 王富丽[1] 连丕勇[1] 

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001

出　　处：《黑龙江科技学院学报》2005年第6期323-326,共4页Journal of Heilongjiang Institute of Science and Technology

基　　金：国家自然科学基金资助项目(29792070)

摘　　要：为研究SiW12/C催化剂对丙烯与乙酸酯化反应的催化性能,采用浸渍法制备了一种负载硅钨杂多酸(H3SiW12O40)的活性炭(SiW12/C)催化剂。采用固定床装置由乙酸和丙烯直接酯化合成乙酸异丙酯。合成实验的最优反应条件:烯酸物质的量比为3∶1,反应温度为120℃,SiW12(30%)/C催化剂用量为5g,反应压力为0.8MPa,体积空速为(LHSV)1h-1。乙酸转化率可达82.1%。分析证明,SiW12/C催化剂具有转化率高、条件温和、选择性好等优点,是催化酸酯化反应的高活性催化剂。Dodecatungstosilicic acid supported on activated carbon（SiW12/C ） consisting of different SiWl2 loadings was prepared and characterized by NH3-TPD techniques. Esterification of propene with acetic acid which was carried out in fixed-bed system was catalyzed by SiWJC catalysts. The catalytic activity of SiW12/C was examined in a heterogeneous reaction system by way of synthesizing isopropyl acetate. Effects of various parameters, including reaction temperature, radio of reactants and stability of catalyst activity were investigated systematically. Correspondingly, the optimum reaction conditions based on experiments are as follows： the suitable reaction-temperature is 120℃, the molar ratio of propylene to acetic acid is 3 ： 1, SIW12（30% ）/C catalyst is 5 g, reaction-pressure is 0.8 MPa, space velocity （LHSV） is 1 h^-1. The conversion of acetic acid is up to 82.1%. The SiW12/C was found to be active catalysts for acid esterification. Higher conversion rate, milder conditions, and better selectivity are the features obtained in our systems.

关 键 词：乙酸异丙酯 硅钨杂多酸H3SiW12O40(SiW12) 活性炭 丙烯 固定床 酯化 

分 类 号：O623.624.2[理学—有机化学]