화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.26, No.3, 666-672, May, 2009
DOI10.1007/s11814-009-0111-0  Export Citation
Reactivity of Bronsted acid ionic liquids as dual solvent and catalyst for Fischer esterifications
Zuojun Wei†, Feijin Li, Huabin Xing, Shuguang Deng1, and Qilong Ren
  • Department of Chemical and Biochemical Engineering, College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, P. R. China
  • 1Department of Chemical Engineering, New Mexico State University, Las Cruces, NM 88003, USA
E-mail:
Abstract.Several water-stable ionic liquids with different acidity and affinity were synthesized and applied as both solvents and acid catalysts for Fischer esterification of ethanol reacting with four aliphatic carboxylic acids (acetic acid, n-hexanoic acid, lauric acid, and stearic acid). Among the studied ionic liquids, [(n-bu-SO3H) MIM][HSO4] (3-butyl-1-(butyl-4-sulfonyl) imidazolium sulfate) and [(n-bu-SO3H) MIM][p-TSO] (3-butyl-1-(butyl-4-sulfonyl) imidazolium toluenesulfonate) show higher reactivity for the production of ethyl esters. The catalytic activities of these ionic liquids are strongly dependent on the acidity of their anions and cations, as well as their hydrophilicity and affinity with the reactants. Water refluxing through the condenser may be another important reason for obtaining high conversion of esterification, indicating a water-sequester process is still needed in order to obtain a higher yield of ester in the ionic liquid catalyzed esterification system. Kinetics studies show the conversions of the acids increase with reaction temperature and time, and reach equilibrium within about two hours. The apparent activation energies are 39.1±2.0, 49.7±2.5, 51.4±2.5 and 59.3±3.0 kJ·mol^(-1) for the formation of ethyl acetate, ethyl n-hexanoate, ethyl laurate and ethyl stearate, respectively.
Keywords:Bronsted Acid Catalyst;Ionic Liquid;Fischer Esterification;Reaction Kinetics;Water Content
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