离子液体微乳液催化油酸乙酯合成  

Esterification of Oleic Acid with Ethanol Catalyzed by Ionic Liquid Microemulsion

作　　者：郑永军[1,2] 李林东 郑勇 季沛霖[1] ZHENG Yongjun;LI Lindong;ZHENG Yong;JI Peilin(School of Chemical&Environmental Engineering,Anyang Institute of Technology,Anyang 455000,China;Henan Key Laboratory of Subcritical High-efficiency Extraction,Anyang 455000,China)

机构地区：[1]安阳工学院化学与环境工程学院,河南安阳455000 [2]河南亚临界萃取重点实验室,河南安阳455000

出　　处：《山东化工》2025年第1期1-4,10,共5页Shandong Chemical Industry

基　　金：河南省教育厅科学技术研究重点项目(22B530001,22B430003);河南省自然科学基金资助项目(232300421209)。

摘　　要：用1-十二烷基-3-甲基咪唑溴化物([C_(12)MIM]Br)和浓硫酸反应制得1-十二烷基-3-甲基咪唑硫酸氢盐([C_(12)MIM]HSO_(4))离子液体,以该离子液体在表面活性剂吐温80存在下与环己烷构筑微乳液,用于油酸和乙醇酯化反应。考察离子液体用量、反应时间、反应温度、油酸和乙醇物质的量比对油酸转化率的影响,得到该体系在无需搅拌下,油酸与乙醇物质的量比为1∶5,[C_(12)MIM]HSO_(4)质量为反应物总质量的6%,在水浴80℃下放置9 h,油酸的转化率可达80.17%。经动态光散射测定微乳体系的粒径分布显示出粒径小,分散均匀,这将大大增加反应物与催化剂[C_(12)MIM]HSO_(4)的界面面积,提高反应速率,酯化反应生成的水溶解到离子液体微乳液的内核中,使酯化反应不断地朝向生成酯方向移动。1-dodecyl-3-methylimidazole hydrogen sulfate([C_(12)MIM]HSO_(4))ionic liquid was prepared by the reaction of 1-dodecyl-3-methylimidazole bromide([C_(12)MIM]Br)and concentrated sulfuric acid.The ionic liquid was used to construct a microemulsion with cyclohexane in the presence of Tween 80 for the esterization of oleic acid and ethanol.Ionic liquid dosage,reaction time,reaction temperature,molar ratio of oleic acid and ethanol on the oleic acid conversion ratio were experimented.The result showed the ionic liquid microemulsion has a excellent catalytic effect without stirring,when the molar ratio of oleic acid and ethanol was 1∶5,[C_(12)MIM]HSO_(4) mass fraction was 6%of the reactants mass,the mixture was placed in 80℃water bath for 9 h,the conversion rate of oleic acid was up to 80.17%.The particle size distribution of the microemulsion measured by dynamic light scattering showed that the particle size was in nanaometer and uniformly distributed,which greatly increased the interface area between the reactants and the catalyst[C_(12)MIM]HSO_(4),and improved the reaction rate.The water generated by the esterification was dissolved into the core of the ionic liquid microemulsion,and the esterification reaction was constantly moving towards the direction of ester formation.

关 键 词：离子液体微乳液 催化 油酸 酯化反应 

分 类 号：TQ655[化学工程—精细化工]