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Citation: Heyuan Song, Meirong Kang, Fuxiang Jin, Guoqin Wang, Zhen Li, Jing Chen. Brønsted-acidic ionic liquids as efficient catalysts for the synthesis of polyoxymethylene dialkyl ethers[J]. Chinese Journal of Catalysis, ;2017, 38(5): 853-861. doi: 10.1016/S1872-2067(17)62816-X shu

Brønsted-acidic ionic liquids as efficient catalysts for the synthesis of polyoxymethylene dialkyl ethers

Heyuan Song ^a,b, ,
Meirong Kang ^a ,
Fuxiang Jin ^a ,
Guoqin Wang ^a,b ,
Zhen Li ^a ,
Jing Chen ^a

a. State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
b. University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 10 February 2017
Revised Date: 17 March 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21473225).

Acetalation of formaldehyde (HCHO) with dialkyl formal or aliphatic alcohol to prepare polyoxymethylene dialkyl ethers (RO(CH₂O)_nR, n ≥ 1) catalyzed by Brønsted-acidic ionic liquids has been developed. The correlation between the structure and acidity activity of various ionic liquids was studied. Among the ionic liquids investigated, 1-(4-sulfonic acid)butyl-3-methylimidazolium hydrogen sulfate ([MIMBs]HSO₄) exhibited the best catalytic performance in the reaction of diethoxymethane (DEM₁) with trioxane. The influences of ionic liquid loading, molar ratio of DEM₁ to HCHO, reaction temperature, pressure, time, and reactant source on the catalytic reaction were explored using [MIMBs]HSO₄ as the catalyst. Under the optimal conditions of n([MIMBs]HSO₄):n(DEM₁):n(HCHO) = 1:80:80, 140℃, and 4 h, the conversion of HCHO and selectivity for DEM_2-8 were 92.6% and 95.1%, respectively. The [MIMBs]HSO₄ catalyst could be easily separated and reused. A feasible mechanism for the catalytic performance of [MIMBs]HSO₄ was proposed.
- Acetalation reaction,
- Polyoxymethylene dialkyl ether,
- Diethoxymethane,
- Formaldehyde,
- Brønsted-acidic ionic liquid
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