反应控制相转移催化环氧化苯乙烯  

Reaction-controlled Phase-transfer Catalysis for Epoxidation of Styrene

作　　者：刘军辉[1,2] 李军[1] 张爱平[1] 刘俊龙[2] 高爽[1] 

机构地区：[1]中国科学院大连化学物理研究所清洁催化合成重点实验室,大连116023 [2]大连工业大学化工与材料学院

出　　处：《应用化学》2010年第7期769-772,共4页Chinese Journal of Applied Chemistry

基　　金：国家重点基础研究发展计划项目(2009CB623505)

摘　　要：研究了磷钨杂多酸盐反应控制相转移催化H2O2直接氧化苯乙烯制环氧苯乙烷的反应,考察了溶剂、H2O2用量、催化剂用量、反应温度、时间、苯乙烯浓度等因素对反应的影响。获得的适宜的反应条件为:乙酸乙酯为溶剂,n(苯乙烯)∶n(H2O2)∶n(催化剂)=300∶300∶1,反应温度60℃,反应时间6h,反应液中苯乙烯质量分数为10%。在该条件下,苯乙烯的转化率为85.5%,环氧苯乙烷的选择性为84.9%。催化剂可过滤回收,循环使用2次后的活性无明显下降。In the present work,epoxidation of styrene with hydrogen peroxide catalyzed by reaction-controlled phase-transfer catalyst of quaternary ammonium heteropolyphosphatotungstate is described. The factors such as solvents,the amount of H2 O2,the amount of catalyst,reaction temperature,reaction time,and the concentration of styrene were investigated. It was found that the optimized conditions are ethyl acetate as the solvent,n（ styrene） ∶ n（ H2O2） ∶ n（ catalyst） = 300∶300∶1,the mass fraction of styrene is 10% ,60 ℃,6 h. Under the optimized conditions,the conversion of styrene is 85. 5% ,and the selectivity of styrene oxide is 84. 9%. The catalyst can be reused with good stability.

关 键 词：反应控制相转移催化 苯乙烯 环氧化 

分 类 号：O625.1[理学—有机化学]