离子液体催化合成巯基丙酸甲酯的性能分析及表征

Performance analysis and characterization of ionic liquid for catalytic synthesis of mercapto methyl propionate

采用一步法合成吡咯烷酮-硫酸离子液体催化剂,利用红外光谱仪、液相色谱仪、热重分析仪、核磁共振氢谱等对其进行表征。研究了该离子液体对甲醇与巯基丙酸酯化反应的催化性能,并与传统浓硫酸催化剂的催化性能进行比较。结果表明,合成物质为[Hnhp]HSO_(4)离子液体且纯度为96%;与传统浓硫酸催化剂相比,以[Hnhp]HSO_(4)离子液体为催化剂时反应时间短,产品的收率高于浓硫酸催化剂产品收率约5%;[Hnhp]HSO_(4)离子液体重复10次试验后,催化剂性能没有降低,且产品收率在85%左右。

A pyrrolidone-sulfuric acid ionic liquid catalyst is synthesized through one-step method,and characterized by means of infrared spectrum,liquid chromatography,thermogravimetric analysis,proton nuclear magnetic resonance and other measurements.The catalytic performance of the ionic liquid for the esterification reaction between methanol and mercaptopropionic acid is studied,and compared with that of traditional concentrated sulfuric acid catalyst.The results show that the obtained substance is[Hnhp]HSO_(4) ionic liquid with a purity of 96%.The reaction using[Hnhp]HSO_(4) ionic liquid as the catalyst spends shorter time than that using the concentrated sulfuric acid catalyst while delivers 5%higher product yield.The performance of[Hnhp]HSO_(4) ionic liquid does not decline after it has been tested for 10 times repeatedly,and the product yield remains around 85%.