SO_4^(2-)/ZrO_2/USY催化合成氯乙酸正丙酯的研究  

Synthesis of propyl chloroacetate catalyzed by SO_4^(2-)/ZrO_2/USY

作　　者：金昌磊[1] 张艳丽[1] 孟丽军[1] 张晓娟[1] 王云霄[1] 

机构地区：[1]唐山学院环境与化学工程系,河北唐山063000

出　　处：《工业催化》2010年第5期64-67,共4页Industrial Catalysis

摘　　要：采用沉淀法制备SO_4^(2-)/ZrO_2/USY催化剂,以氯乙酸和正丙醇为原料,催化合成氯乙酸正丙酯,考察反应时间、带水剂种类、带水剂用量、醇酸物质的量比及催化剂用量等因素对酯化反应的影响。结果表明,环己烷为氯乙酸正丙酯合成反应较适宜的带水剂,SO_4^(2-)/ZrO_2/USY在酯化反应中具有良好的催化活性。在氯乙酸0.25mol、n(醇):n(酸)=1.5、反应时间3.0h、带水剂环己烷7.5mL和催化剂用量1.0g条件下,酯化率达95.72%。催化剂重复使用6次,酯化率仍可达94.91%,催化活性基本不变,具有良好的重复使用性能。SO_4^(2-)/ZrO_2/USY具有反应条件温和、催化活性高、重复使用性能好和环境污染小等优点,具有较高的开发价值。Solid acid SO4^2-/ZrO2/USY catalyst supported on USY zeolite was prepared by precipitation. Propyl chloroacetate was synthesized via the esterification of propanol and chloroacetic acid over SO4^2-/ZrO2/USY. Influence of reaction time, the kind and dosage of water carrying agents, molar ratio of pro- panol to chloroacetic acid, and catalyst dosage on esterification yield was investigated, The experimental results indicated that esterification yield of 95.72% was attained under the reaction condition as follows： chloroacetic acid amount 0.25 mol, molar ratio of propanol to chloroacetic acid 1.5 ,reaction time 3 h, water carrying agent dosage of cyclohexane 7.5 mL, and catalyst dosage 1.0 g. The esterification yield still reached 94.91% after the catalyst was repeatedly used for 6 times. SO4^2-/ZrO2/USYcatalyst exhibited excellent catalytic activity and reusability, and little environmental pollution under mild reaction condition.

关 键 词：精细化学工程 SO_4~2-/ZrO_2/USY催化剂 分子筛 氯乙酸正丙酯 酯化反应 

分 类 号：O643.36[理学—物理化学] O623.624[理学—化学]