Fischer Esterification Promoted by Recyclable Brönsted Acidic Ionic Liquids

Jun Liu; Bao Hua Huang; Hong Liu; Zi Jin Li; Kun Zhang

doi:10.4028/www.scientific.net/AMR.550-553.622

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 550-553Fischer Esterification Promoted by Recyclable...

Fischer Esterification Promoted by Recyclable Brönsted Acidic Ionic Liquids

Abstract:

A series of Brönsted acidic ionic liquids based on 2-pyrrolidonium, 1-methylimidazolium, morpholinium and 4-methylmorpholinium cations ([Hnhp]⁺, [Hmim]⁺, [Hnhm]⁺ and [Hnmm]⁺) with anions HSO₄ˉ and BF₄ˉ, were synthesized. Their catalytic activities in the esterification of n-butyric acid with ethanol were studied and the relationships between catalysis performance and acidity were discussed. The optimum conditions of the esterification were determined as follows: 80 °C oil bath, n (n-butyric acid): n (ethanol): n ([Hnhp]HSO₄) = 1:1.2:0.4 and t = 2 h, the yield of ethyl butyrate could reach 86%. There is no appreciable decrease of catalyst activity of [Hnhp]HSO₄ after 5 cyclic repetitions.

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Advanced Materials Research (Volumes 550-553)

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622-625

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.550-553.622

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Online since:

July 2012

Authors:

Jun Liu, Bao Hua Huang, Hong Liu, Zi Jin Li, Kun Zhang

Keywords:

Fischer Esterification, Imidazolium, Ionic Liquid (IL), Morpholinium, Pyrrolidonium

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