Abstract
Four kinds of Brønsted-acidic ionic liquids were synthesized with netrogen-contained chemical groups and different anions,and were characterized by nuclear magnetic resonance (NMR) and infrared spectrum (IR). On this basic, when the mole ratio of catalyst quantity to oleic acid was 0.019, that of alcohol to acid was 2, the reaction temperature was 150°C and the reaction time was 5 hours,the esterification of oleic and methanol were studied and the catalytic activities of ionic liquids for the esterification were investigated. The results showed their catalytic activities were associated with the structures of nitrogen-contained chemical groups, anionic acid strength and acid volume. Under the coaction of anions and cations, ionic liquids ([MPy]HSO4) had the best catalysis activity. Meanwhile the conversion rate of oleic acid could reach 88.21% .
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