Back to results
US 2024/0343575 A1Published application
Solvent-free process for preparing a salt of bis(fluorosulfonyl)imide
AssigneeSpecialty Operations France
InventorEtienne Schmitt
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a method for preparing salts of bis(fluorosulfonyl)imide and to a method for preparing alkali metal salts of bis(fluorosulfonyl)imide from said bis(fluorosulfonyl)imide salts. More specifically, the invention provides a new method for producing these salts of bis(fluorosulfonyl)imide which is implementable at industrial scale and providing high-purity bis(fluorosulfonyl)imide salts.
Claims15
A process for preparing a salt of bis(fluorosulfonyl)imide of formula (I):
- [F—(SO2)—N−—(SO2)—F]nX1n+ (I)
- wherein:
- X1n+ is a cation selected from the group consisting of K+, Na+ and an onium cation, and
- n is 1 and represents the valence of the cation, the process comprising the fluorination of a bis(chlorosulfonyl)imide of formula (II):
- [Cl—(SO2)—N−—(SO2)—Cl]nX1n+ (II)
- with anhydrous hydrogen fluoride (III),
- wherein the process is carried out in molten salt of bis(fluorosulfonyl)imide of formula (I) and/or molten salt of bis(chlorosulfonyl)imide of formula (II), in the absence of solvent or in the presence of an amount of solvent less than 5 wt. % based on the total weight of the reaction mixture.
4 more elements
Dependencies are inferred from the claim text.