Journal
CATALYSIS COMMUNICATIONS
Volume 5, Issue 9, Pages 473-477Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2004.06.004
Keywords
ionic liquid; Bronsted acid; esterification; catalyst
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Under mild conditions and without any additional organic solvent, esterification of alcohols by carboxylic acids could be carried out in three new halogen-free Bronsted acidic ionic liquids, 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulfate, 1-(4-sulfonic acid) butylpyridinium hydrogen sulfate and N-(4-sulfonic acid)butyl triethylammonium hydrogen sulfate. Especially for esterification of ethanol by acetic acid, good conversion rate and high selectivity were obtained, and the liquid esters formed a separate phase that was decanted. The ionic liquid could be reused after removal of water under vacuum.
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