Preparation of 1-butyl-3-methylimidazolium dodecatungstophosphate and its catalytic performance for esterification of ethanol and acetic acid |
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Authors: | Jiehua Shi Gao Pan |
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Institution: | (1) College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, 310032, China;(2) State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou, 310032, China |
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Abstract: | 1-Butyl-3-methylimidazolium dodecatungstophosphate catalyst (bmim]3PW12O40) with high water tolerance was prepared from 1-butyl-3-methylimidazolium bromide (bmim]Br) and phosphotungstic acid (H3PW12O40). The catalyst was characterized by means of Fourier transform infrared spectroscopy, thermogravimetry-differential scanning
calorimetry, n-BuNH2 potentiometric titration, elemental analysis and so on. Its catalytic activity for esterification of ethanol and acetic acid
to ethyl acetate was measured. The results show that there were three crystal-water molecules in the bmim]3PW12O40 catalyst, and it preserved the primary Keggin structure and acid strength of H3PW12O40. The acid amount of bmim]3PW12O40 catalyst was less than that of H3PW12O40. The bmim]3PW12O40 catalyst exhibited higher catalytic activity and reusability in the esterification of ethanol and acetic acid to ethyl acetate.
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Translated from Chinese Journal of Catalysis, 2008, 29(7) (in Chinese) |
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Keywords: | 1-butyl-3-methylimidazolium bromide 12-phosphotungstic acid heteropoly acid 1-butyl-3-methylimidazolium dodecatungstophosphate ethanol acetic acid esterification ethyl acetate |
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