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The esterification of ethanol, 1-propanol and 1-butanol with acetic acid in three ionic liquids with HSO4 - anion and 1-alkyl-3-methylimidazolium cation was investigated. The ionic liquids are 1-methylimidazolium hydrogen sulfate (HMIM)(HSO4), 1-ethyl-3-methylimidazolium hydrogen sulfate (EMIM)(HSO4) and 1-butyl-3-methylimidazolium hydrogen sulfate (BMIM)(HSO4), which have catalytic activity. Data and modeling on the reaction conversions and the distribution of the compounds between the phases is reported here. Trends for the change in the liquid-liquid equilibrium, with parameters like alkyl chain length on the cation or the alcohol, are discussed and used to estimate the phase behavior of similar esterification systems.

Esterifications in Ionic Liquids with 1-Alkyl-3-Methylimidazolium Cation and Hydrogen Sulfate Anion: Conversion and Phase Equilibrium