Title:
PURIFICATION OF LITHIUM SALT OF ORGANIC ACID
Document Type and Number:
Japanese Patent JP3750179
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a highly purified lithium salt of an organic acid useful for a raw material of a lithium cell, etc., by recrystallizing a crude lithium salt of a specific organic acid containing impurities with 1,4-dioxane, dissolving in a polar solvent having a specific boiling point, and filtering and removing the polar solvent from the filtered solution.
SOLUTION: The objective purified lithium salt of an organic acid having high purity and high performances is obtained by subjecting a crude lithium salt of an organic acid containing impurities to the two purification processes, that is, (A) recrystallizing the lithium salt of an organic acid expressed by the formula (Rf is a 1-4C perfluoroalkyl; X is O, N or C atom; (n) is 1 when X is O, 2 when X is N and 3 when X is C) [e.g. lithium bis(trifluoromethane sulfonyl)imide] and containing impurities with 1,4-dioxane and (B) dissolving the lithium salt of the organic acid in a polar solvent (e.g. ethanol) having ≤100°C boiling point, filtering and removing the polar solvent from the resultant filtrated solution (either process A or B may be performed at the first).
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Inventors:
Jin Suzuki
Yuji Yoshida
Yuji Yoshida
Application Number:
JP6599496A
Publication Date:
March 01, 2006
Filing Date:
March 22, 1996
Export Citation:
Assignee:
Mitsubishi Chemical Corporation
International Classes:
C07F1/02; (IPC1-7): C07F1/02
Domestic Patent References:
| JP4501118A | ||||
| JP3501860A | ||||
| JP9104686A | ||||
| JP8081436A |
Attorney, Agent or Firm:
Hasegawa Soji