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Synthesis of Polyoxymethylene Dimethyl Ethers Catalyzed by Pyrrolidinonium‐Based Ionic Liquids
Author(s) -
Yang Zhenyu,
Hu Yufeng,
Ma Weiting,
Qi Jianguang,
Zhang Xianming
Publication year - 2017
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201600633
Subject(s) - trioxane , ionic liquid , catalysis , selectivity , dimethoxymethane , chemistry , diesel fuel , trifluoromethanesulfonate , polyoxymethylene , oxygenate , organic chemistry , chemical engineering , inorganic chemistry , polymer , copolymer , engineering
Polyoxymethylene dimethyl ethers (PODE n ) are widely applied as diesel additives in engines. Ionic liquids (ILs) replace traditional liquid acids as catalysts in chemical processes. A series of pyrrolidinonium‐based Brønsted acidity ILs were synthesized, investigated, and employed as catalysts for the synthesis of PODE n from methylal and trioxane for the first time. The Hammett function values were measured to uncover the connection between catalytic performance and acidity‐activity of the ILs considered. The optimal experimental conditions for the synthesis of PODE n were determined. The maximum values of both the conversion of raw material and the selectivity of PODE 3–8 were obtained with 1‐octyl‐2‐pyrrolidinonium trifluoromethanesulfonate ([NOP][TFO]) as the catalyst. [NOP][TFO] provides greater selectivity of PODE 3–4 than the traditional catalysts such as H 2 SO 4 and CF 3 SO 3 H.