Method for producing disulfonylamine alkali metal salt

Patent metadata

Field	Value
Publication number	US-2016016797-A1
Application number	US-201414773964-A
Country	US
Kind code	A1
Filing date	Mar 5, 2014
Priority date	Mar 18, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

The present invention provides a method for producing a disulfonylamine alkali metal salt, including a step of subjecting a disulfonylamine onium salt represented by formula [I] (wherein each of R 1 and R 2 independently represents a fluorine atom or a fluorinated alkyl group having 1 to 6 carbon atoms, provided that at least one of R 1 and R 2 represents a fluorine atom, and each of R 3 , R 4 , R 5 and R 6 independently represents a hydrogen atom or the like) to a cation exchange reaction in an organic solvent, thereby producing a disulfonylamine alkali metal salt represented by formula [II] (wherein M + represents an alkali metal cation, and R 1 and R 2 are as defined in formula [I]), and a step of filtering the organic solvent solution containing the disulfonylamine alkali metal salt through a filter having a particle retention size of 0.1 to 10 μm to obtain a filtrate.

First claim

1 . A method for producing a disulfonylamine alkali metal salt, the method comprising:
a step of subjecting a disulfonylamine onium salt represented by formula [I]:

wherein each of R 1 and R 2 independently represents a fluorine atom or a fluorinated alkyl group having 1 to 6 carbon atoms, provided that at least one of R 1 and R 2 represents a fluorine atom, each of R 3 , R 4 , R 5 and R 6 independently represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxyalkyl group having 1 to 6 carbon atoms, and two groups among R 3 , R 4 , R 5 and R 6 may be combined to form a 5- to 8-membered ring in which a nitrogen atom to which the groups are bonded functions as one of the ring atoms,
to a cation exchange reaction in an organic solvent, thereby producing a disulfonylamine alkali metal salt represented by formula [II]:

wherein M + represents an alkali metal cation, and R 1 and R 2 are as defined in formula [I], and
a step of filtering an organic solvent solution containing the disulfonylamine alkali metal salt through a filter having a particle retention size of 0.1 to 10 μm to obtain a filtrate.

2 . The method according to claim 1 , wherein the filter is a membrane filter.

3 . The method according to claim 1 , wherein the organic solvent is an ester-based solvent.

4 . The method according to claim 1 , wherein the organic solvent is isopropyl acetate.

5 . The method according to claim 1 , further comprising, after the filtering step, a step of concentrating the filtrate at a temperature of 0 to 70° C.

6 . The method according to claim 5 , wherein after the filtering step, the filtrate is concentrated at a temperature of 0 to 50° C.

7 . The method according to claim 1 , further comprising, after the step of performing the cation exchange reaction and before the filtering step, a step of removing onium cations from the organic solvent solution by washing the organic solvent solution with water.

8 . The method according to claim 5 , further comprising, after the concentration step, a step of precipitating the disulfonylamine alkali metal salt.

9 . The method according to claim 6 , further comprising, after the concentration step, a step of precipitating the disulfonylamine alkali metal salt.

Assignees

• Nippon Soda Co

Inventors

• Maekawa Hideki
• Yasuhara Masamichi
• Hayashi Ken-Ichi

Classifications

• C01B21/086 Primary

  containing one or more sulfur atoms · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• C07C311/48

  having nitrogen atoms of sulfonamide groups further bound to another hetero atom · CPC title

• C07C303/40

  by reactions not involving the formation of sulfonamide groups · CPC title