| 摘要 |
Provided is an ionic liquid, represented by the formula K+A-, having a very low content of impurities, especially a low content of halogen ions and/or a low content of alkali metal, wherein K+is a quaternary ammonium ion, for example an imidazolium ion. Also provided is a quaternarization process for making the ionic liquid in reacted with an acid ester such as a sulfate or phosphate.
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