Superhigh purity ionic liquid
AssigneeDai-Ichi Kogyo Seiyaku Co., Ltd.
InventorsHirofumi Uchimura, Manabu Kikuta
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Abstract
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.
Claims2
An ionic liquid, represented by the formula K+A−, comprising a cation, K+, that is 1 -ethyl-3-methyl imidazolium and an anion, A−, that is a halogenated sulfonyl imide anion represented by [XSO2]2N, X representing halogen, wherein the content of an alkali metal as an impurity in the ionic liquid is 5 ppm or less and the content of a halogen ion is 1 ppm or less.
Dependencies are inferred from the claim text.