Abstract
AbstractCyclodehydration 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]HSO4) 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]HSO4 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.
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