新型Bronsted酸性杂多酸类离子液体的合成及其催化缩醛反应  

Synthesis of Novel Bronsted Acid Heteropoly Acids Ionic Liquids and Study on Catalytic Acetalization

作　　者：孙丽 柴文 谢小龙 郭小丽 蔡施宇 胡金良 郁人杰 SUN Li;CHAI Wen;XIE Xiaolong;GUO Xiaoli;CAI Shiyu;HU Jinliang;YU Renjie(School of Materials Engineering,Changshu Institute of Technology,Changshu 215500;School of Chemical Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]常熟理工学院材料工程学院,江苏常熟215500 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《常熟理工学院学报》2020年第2期97-102,共6页Journal of Changshu Institute of Technology

摘　　要：制备了新型的氯代1-甲基-3-(4’-丁酸基)咪唑离子液体,通过阴离子交换合成了新型Bronsted酸性类离子液体:1-甲基-3-(4’-丁酸基)咪唑磷钨杂多酸盐.探究其在不同溶剂中的溶解性及其Bronsted酸性,并以该类离子液体为酸性催化剂研究了正戊醛和乙二醇的酸催化缩醛反应.实验结果表明,在70℃下,反应物物质的量比为n(正戊醛)︰n(乙二醇)︰n(催化剂)为1.5︰1︰0.015,反应时间为1 h,乙二醇的转化率可达到97.3%,缩醛化选择性可达到99%以上.该催化体系可实现催化剂的反应控制相转移,催化剂易于回收利用,产物易分离,后处理简便易行,绿色环保.This paper reports the preparation of novel chloro-1-methyl-3-(4’-butyric acidic)imidazolium ionic liquids,and the novel Bronsted acidic ionic liquid synthesis of the 1-methyl-3-(4’-butyric acidic)imidazolium phosphotungstic heteropoly acid salt through the design of anion exchange,and explores its solubility in different solutions and its Bronsted acidity.The acid-catalyzed acetal reaction of n-pentanal and ethylene glycol was studied using this kind of ionic liquid as an acid catalyst.The results show that using the salt as a catalyst,under the reaction conditions of 70℃,with reactant molar ratio n(n-pentanal):n(ethylene glycol):n(catalyst)being 1.5∶1∶0.015,after the reaction time reaches 1h,the conversion rate of ethylene glycol can reach 97.3%,and that the selectivity can be achieved up to 99%.Moreover,this catalytic system can realize the reaction-controlled phase transfer of the catalyst,and simultaneously the catalyst is easy to be recycled,the product is easy to be separated,and the post-processing is convenient and easy to be carried out,and the catalyst is quite environmental-friendly.

关 键 词：Bronsted酸性 杂多酸类离子液体 缩醛反应 反应控制相转移催化 

分 类 号：O621.3[理学—有机化学]