Alkoxyl side‐chain effects of acidic ionic liquids catalysts for the esterification of n‐butyl butyrate. (19th March 2021) - Feng, Xiantao
Abstract: Three kinds of alkoxy group‐functionalized acidic ionic liquids (ILs) are reported in this work, namely, 1‐(methoxyethyl)‐3‐methylimidazolium hydrogen sulphate [MOE‐MIM]HSO4, 1‐(ethyoxyethyl)‐3‐methylimidazolium hydrogen sulphate [EOE‐MIM]HSO4, and 1‐(propyoxyethyl)‐3‐methylimidazolium hydrogen sulphate [POE‐MIM]HSO4 . The short side chain on the cation of [MOE‐MIM]HSO4 decreases the solubility of the IL in butanol and butyric acid and facilitates the separation of the IL from a reaction medium. The yield of butyl butyrate is up to 99.5%. After 10 rounds of recycling, the catalytic performance of [MOE‐MIM]HSO4 shows no significant changes. Abstract : Three kinds of Alkoxyl side‐chain containing acidic ionic liquids are used to catalyze the esterification of butyl butyrate. The shorter side chain on the cation of [MOE‐MIM]HSO4 makes it less soluble in butanol and butyric acid, and easier separation from the reaction medium. The yield of the butyl butyrate is up to 99.5%. After reuse for 10 times, the catalytic activity of [MOE‐MIM]HSO4 shows no significant changes.