Abstract
Cyclodehydration of diethylene glycol using various Br0nsted acidic ionic liquids as dual solvent-catalysts was studied for the first time. Better results were obtained in the presence of l-butyl-3-methylimidazolium hydrogen sulfate ([SPmim]HSO4) than other Brønsted 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.
| Original language | English |
|---|---|
| Pages (from-to) | 1390-1394 |
| Number of pages | 5 |
| Journal | Chinese Journal of Chemistry |
| Volume | 26 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2008 |
Keywords
- 1,4-dioxane
- Acidity characterization
- Brønsted acidic ionic liquid
- Cyclodehydration
- Diethylene glycol