US 9,079,780 B2 · Alkali metal salt of fluorosulfonyl imide, and production method therefor

Abstract

The present invention provides an alkali metal salt of fluorosulfonyl imide having favorable heat resistance and a reduced content of specific impurities and a water content, and provides a method for producing an alkali metal salt of fluorosulfonyl imide, which is capable of easily removing a solvent from a reaction solution. An alkali metal salt of fluorosulfonyl imide of the present invention is represented by the following general formula (I) and has a mass loss rate of 2% or less when the alkali metal salt of fluorosulfonyl imide is kept at 100° C. for 8 hours under an air current. A method for producing an alkali metal salt of fluorosulfonyl imide of the present invention comprises a step of concentrating a solution of the alkali metal salt of fluorosulfonyl imide by bubbling a gas into a reaction solution containing the alkali metal salt of fluorosulfonyl imide, and/or concentrating a solution of the alkali metal salt of fluorosulfonyl imide by thin layer distillation.

Claims16

Dependent claims

A composition comprising an alkali metal salt of fluorosulfonyl imide represented by the following formula (I), having a content of sulfate ions (SO42−) of 3,000 ppm or less,

wherein in the formula (I), Ma represents an alkali metal, and Ra and Rb are the same or different and represent a fluorine atom, or a alkyl group having 1 to 6 carbon atoms in which one or more hydrogen atoms are substituted with a fluorine atom, and at least one of Ra or Rb is a fluorine atom.

Dependencies are inferred from the claim text.

Alkali metal salt of fluorosulfonyl imide, and production method therefor

Life of this patent

Alkali metal salt of fluorosulfonyl imide, and production method therefor

Life of this patent

Abstract

Claims16