Patent ID: 9428428
Filing Date: 2016-08-30
CPC Classification: B01J,C07C,Y02P

Claim Text:
1. 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 injection of antimony pentachloride into the catalytic reactor.