| 摘要 |
PROBLEM TO BE SOLVED: To efficiently remove impurities containing an OH group in the molecule such as a minute amount of water, etc., having difficulty in removal under reduced pressure from a compound even in the case of a compound such as ethylmethylimidazolium tetrafluoroborate having extremely high hydrophilicity without admixture of metal impurities and requiring a filtration process. SOLUTION: The method for removing impurities comprises using at least one silicon compound selected from the group consisting of a monohalosilane compound such as trimethylchlorosilane, etc., a monoalkoxysilane compound such as methoxytrimethylsilane, etc., a monoaryloxysilane compound such as phenoxytrimethylsilane, etc., and a monoaminosilane compound such as bis(trimethylsilyl)amine, etc. Since the silicon compound is reacted with the OH group of the impurities into a highly volatile substance, the substance is readily removed under pressure. COPYRIGHT: (C)2005,JPO&NCIPI
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