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Brønsted Acidic Ionic Liquids as Efficient Reaction Medium for Cyclodehydration of Diethylene Glycol
Author(s) -
WANG YuanYuan,
LI Wei,
DAI LiYi
Publication year - 2008
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200890253
Subject(s) - ionic liquid , chemistry , diethylene glycol , catalysis , solvent , hydrogen sulfate , selectivity , inorganic chemistry , molar ratio , organic chemistry , ethylene glycol
Abstract Cyclodehydration of diethylene glycol using various Brønsted acidic ionic liquids as dual solvent‐catalysts was studied for the first time. Better results were obtained in the presence of 1‐butyl‐3‐methylimidazolium hydrogen sulfate ([SPmim]HSO 4 ) than other Br?nsted acidic ionic liquids. The effects of reaction conditions such as reaction temperature, reaction time and molar ratio of ionic liquid/diethylene glycol were investigated. Good conversion rate and high selectivity were obtained in ionic liquid [SPmim]HSO 4 under the optimum conditions. A Hammett method was used to determine the acidity order of these ionic liquids and the results were consistent with the catalytic activities observed in the cyclodehydration reaction.