Preparation of sulfur fluorides
AssigneeAllied Chemical Corporation
InventorsRichard Elmer Eibeck, Robert Edwin Booth
Life of this patent
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Abstract
A process, which may be continuous, for preparation of sulfur fluorides by reacting a sulfur chloride component with a fluorine containing component selected from the group consisting of nitrosyl fluoride and nitrosyl fluoride-hydrogen fluoride complex.
Claims18
A process for preparing a sulfur fluoride component which is sulfur tetrafluoride, sulfur chloride pentafluoride or mixtures thereof comprising:
- reacting under anhydrous conditions a sulfur chloride component selected from sulfur monochloride, sulfur dichloride, sulfur tetrachloride and mixtures thereof, with a fluorine containing component selected from nitrosyl fluoride, nitrosyl fluoride-hydrogen fluoride complexes and mixtures thereof, at a temperature above the highest melting point of any compound in the reaction mixture of sulfur chloride component and fluorine containing component;
- sulfur tetrafluoride being the predominant sulfur fluoride component when nitrosyl fluoride-hyrogen fluoride complex is the predominant fluorine containing component and sulfur chloride pentafluoride being the predominant sulfur fluoride component when nitrosyl fluoride is the predominant fluorine containing component and elemental chlorine is present;
- thereby forming a mixture of said sulfur fluoride component and nitrosyl chloride;
- and
- thereafter recovering from said mixture said sulfur fluoride component as the principal reaction product.
A continuous process for the preparation of sulfur tetrafluoride comprising combining nitrosyl fluoride-hydrogen fluoride complex with chlorine and sulfur as elemental sulfur and elemental chlorine, as a sulfur chloride or as a mixture thereof as ingredients in a reaction mixture;
- continuously reacting said ingredients together under anhydrous conditions by causing the reaction mixture to reach a temperature above about -30.degree. C;
- continuously fractionating the reaction mixture to remove hydrogen chloride and then to remove sulfur tetrafluoride;
- and continuously adding sulfur, chlorine and hydrogen fluoride to the mixture to maintain a numerical ratio of sulfur atoms, to chlorine atoms, to nitrosyl fluoride molecules, to hydrogen fluoride molecules of about greater than 1:4:4:12.
Dependencies are inferred from the claim text.