Preparation of l-butyl-3-methylimidazolium dodecatungstophosphate and its. catalytic performance for esterification of ethanol and acetic acid

• 来源期刊: 中国高等学校学术文摘·化学
• 关键词: l-butyl-3-methylimidazolium bromide 12-phosphotungstic acid heteropoly acid l-butyl-3-methylimidazolium dodecatungstophosphate ethanol acetic acid esterification ethyl acetate
• 年，卷（期）: 2009,（2）
• 页码范围: 132-135
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11458-009-0032-9

摘要

l-Butyl-3-methylimidazolium dodecatungstophosphate catalyst ([bmim]3PW12040) with high water tolerance was prepared from l-butyl-3-methylimidazolium bromide ([bmim]Br) and phosphotungstic acid (H3PW12O40). The catalyst was characterized by means of Fourier transform infrared spectroscopy, thermogravi-metry-differential scanning calorimetry, n-BuNH2 poten-tiometric 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]3PW12040 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.