Method for producing onium sulfonyl imide salts and alkali metal sulfonyl imide salts
AssigneeRhodia Operations
InventorEtienne Schmitt
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Abstract
The invention relates to a new method for producing an onium salt of bis(fluorosulfonyl)imide and an alkali metal salt of bis(fluorosulfonyl)imide of high purities, as industrial scale, and with a reasonable cost when compared to the other available methods. Said method comprises the steps of reacting bis(chlorosulfonyl)imide or salts thereof with an onium halide other than an onium fluoride to produce an onium salt of bis(chlorosulfonyl)imide, reacting the onium salt of bis(chlorosulfonyl)imide with an onium fluoride to produce an onium salt of bis(fluorosulfonyl)imide; the onium salt of bis(fluorosulfonyl)imide may be further reacted with an alkali metal salt to obtain an alkali metal salt of bis(fluorosulfonyl)imide.
Claims20
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 halide other than an onium fluoride 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),
- b) reacting the onium salt of CSI with an onium fluoride to produce an onium salt of bis(fluorosulfonyl)imide (onium salt of FSI).
The method for producing an alkali salt of bis(fluorosulfonyl)imide, comprising the steps of:
- a) reacting a bis(chlorosulfonyl)imide or a salt thereof with an onium halide other than an onium fluoride 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),
- b) reacting the onium salt of CSI with an onium fluoride to produce an onium salt of bis(fluorosulfonyl)imide (onium salt of FSI),
- c) reacting the onium salt of FSI with an alkali metal salt to obtain an alkali metal salt of bis(fluorosulfonyl)imide (alkali metal salt of FSI).
Dependencies are inferred from the claim text.