Method for producing alkali sulfonyl imide salts
AssigneeSpecialty Operations France
InventorEtienne Schmitt
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Abstract
The present disclosure relates to a new method for producing alkali salt of bis(fluorosulfonyl)imide of high purity, as industrial scale, and with a reasonable cost when compared to the other available methods. Said method comprises the steps of reacting a bis(chlorosulfonyl)imide or a salt thereof with an onium chloride to produce an onium salt of bis(chlorosulfonyl)imide; reacting an onium salt of bis(chlorosulfonyl)imide with anhydrous hydrogen fluoride in at least one organic solvent to produce onium salt of bis(fluorosulfonyl)imide; and reacting the onium salt of bis(fluorosulfonyl)imide with an alkali salt to obtain alkali salt of bis(fluorosulfonyl)imide.
Claims15
A method for producing an onium salt of bis(fluorosulfonyl)imide, comprising the steps of:
- a) reacting a bis(chlorosulfonyl)imide or salt thereof, with an onium chloride, to produce an onium salt of bis(chlorosulfonyl)imide (onium salt of CSI), wherein the step is carried out in molten bis(chlorosulfonyl)imide (or salt thereof), in the absence of solvent or in the presence of a solvent less than 5 wt. % based on the total weight of the reaction mixture involved in step a);
- and
- b) reacting the onium salt of CSI with anhydrous hydrogen fluoride in at least one organic solvent to produce an onium salt of bis(fluorosulfonyl)imide (onium salt of FSI).
Dependencies are inferred from the claim text.