Method for producing difluoromethane
AssigneeArkema France
InventorsAnne Pigamo, Bertrand Collier, Joaquin Lacambra
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Abstract
A method for producing difluoromethane, including the catalytic reaction of dichloromethane with hydrogen fluoride in the liquid phase, in the presence of chlorine, and in the presence of an ionic liquid catalyst consisting of the product of the reaction of antimony pentachloride with an organic salt having the general formula X+A, where A is a halide anion or hexafluoroantimonate, and X+ is a quaternary ammonium cation, quarternary phosphonium or ternary sulfonium. Further, equipment suitable for implementing said method.
Claims21
A process for production of difluoromethane comprising catalytic reaction in a catalytic reactor of dichloromethane with hydrogen fluoride in a liquid phase in presence of chlorine and in presence of an ionic liquid catalyst consisting of a product of a reaction of antimony pentachloride with an organic salt of general formula X+A− in which A+ is a halide or hexafluoroantimonate anion and X+ is a quaternary ammonium, quaternary phosphonium or ternary sulfonium cation;
- wherein the process comprises a preliminary stage of charging the catalytic reactor, comprising:
- injection of a solvent into the catalytic reactor;
- dissolution, in the solvent, of the organic salt of the general formula X+A−;
- and
- injection of antimony pentachloride into the catalytic reactor.
Dependencies are inferred from the claim text.