| 摘要 |
PROBLEM TO BE SOLVED: To remove impurities in the form of organic or inorganic matter with an easy method without requiring a complex procedure. SOLUTION: This ionic liquid refining method comprises processes for: supplying ionic liquid containing organic and inorganic matter to a refining tank 12; extracting the organic matter into a supercritical fluid by supplying a given amount of the supercritical fluid to the refining tank 12 to bring it into contact with the ionic liquid, and precipitating inorganic matter; taking out the ionic liquid together with the precipitated inorganic matter from the refining tank 12; and separating and removing the inorganic matter from the ionic liquid taken out, and obtaining highly purified ionic liquid having organic matter and inorganic salt removed therefrom. When the ionic liquid contains water, water is simultaneously taken out when taking out the ionic liquid from the refining tank 12, water is separated and removed from the ionic liquid when separating the inorganic matter, to obtain highly purified ionic liquid. Supercritical fluid is taken out together with organic matter extracted from the refining tank 12, and extracting fluid with the organic matter separated and removed therefrom is preferably recovered into a liquid tank 11. COPYRIGHT: (C)2006,JPO&NCIPI
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