Solvay Fluor Und Derivate Gmbh

Solvay Sa

Solvay Fluor Gmbh

Alf Schulz

Werner Rudolph

Stefan Palsherm

Matthias Rieland

Ulrich Seseke-Koyro

Eckhard Hausmann

Thomas Born

Ruediger Sander

Lothar Zipfel

Placido Garcia-Juan

Dirk Seffer

Ralf Herkelmann

LiPOF, an electrolyte salt additive for batteries, is manufactured by the reaction of POF, PFor mixtures thereof, with LiPOforming a reaction mixture comprising LiPOF. When POFis applied, the reaction mixture which contains essentially only LiPOFis preferably extracted from the reaction mixture with a solvent which also is applicable as solvent for lithium ion batteries. If PFis applied, then, depending on the molar ratio of PFand LiPO, the reaction mixture also contains LiF and/or LiPF. To isolate pure LiPOFfrom LiF, the reaction mixture containing essentially only LiPOFand LiF may for example, be extracted with dimethoxyethane, acetone, dimethyl carbonate or propylene carbonate. To isolate pure LiPOFfrom LiPF, the reaction mixture containing essentially only these constituents is preferably extracted with a solvent which also is applicable as solvent for the LiPFin lithium ion batteries to dissolve and remove LiPF.

[object Object]

The preparation of phosphorus pentafluoride and arsenic pentafluoride by reacting corresponding trihalides with elemental chlorine, bromine or iodine and also with hydrogen fluoride.

Method of preparing inorganic pentafluorides

A method of preparing sulfuryl fluoride by disproportionation of sulfuryl chloride fluoride in the gas phase on activated carbon.

Disproportionation of sulfuryl chloride fluoride

Sulfuryl fluoride is prepared selectively and in a high yield from sulfur dioxide and elemental fluorine in the presence of an alkali fluoride and hydrogen fluoride. The preferred alkali fluoride is potassium fluoride.

Process of preparing sulfuryl fluoride

Sulfuryl fluoride (SO.sub.2 F.sub.2) frequently contains chlorine, sulfur dioxide and other acidic impurities owing to its production. Effective purification is possible if the sulfuryl fluoride is contacted with hydrogen peroxide or a precursor thereof, preferably in an aqueous solution. The purified product is suitable as a pesticidal agent, for example.

Purification of sulfuryl fluoride

A method for stabilizing and/or purifying perfluoroalkanes, particularly from perfluoroalkanes which contain polyfluoroalkane by-products from their production process, in which the perfluoroalkanes are stabilized and/or purified by reacting the polyfluoroalkane(s) with fluorine at elevated pressure and temperature, to obtain perfluoroalkanes which are substantially free of polyfluoroalkanes. The method has the advantage that the perfluorination takes place rapidly and without significant formation of by-products or decomposition products.

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Wedemark, Germany

Alf Schulz