Process for producing difluoromethane

Details Process for producing difluoromethane Process for producing difluoromethane

C - Chemistry, Metallurgy

07

C

C07C 19/08 (2006.01) C07C 17/20 (2006.01)

Patent

CA 2193634

The present invention is directed to difluoromethane prepared by reacting dichloromethane and hydrogen fluoride in a liquid phase in the presence of a fluorination catalyst under reaction conditions in which the reaction pressure is between 1 and 10 kg/cm2ab., and the reaction temperature is between 50 and 150°C, provided that the selected reaction temperature is higher than the temperature at which hydrogen fluoride is not liquefied under the selected reaction pressure. Under the above conditions, the conversion of dichloromethane and HF is very high, and amount of by-products other than R30 is very low, typically less than 0.1 % per difluoromethane, when the unreacted materials are recycled. The reactor is hardly corroded by the reaction using an antimony chlorofluoride and HF which are highly corrosive, as long as the above conditions are maintained.

Procédé de production de difluorométhane par fluoration de dichlorométhane avec du fluorure d'hydrogène en phase liquide en présence d'un catalyseur de fluoration et dans des conditions telles que la réaction s'effectue sous une pression absolue comprise entre 1 et 10 kg/cm<2> et à une température comprise entre 50 et 150 DEG C, la température réactionnelle choisie étant une température à laquelle le fluorure d'hydrogène ne peut se liquéfier sous ladite pression. Ces conditions permettent d'obtenir un taux très élevé de transformation de dichlorométhane et de fluorure d'hydrogène, et de minimiser les quantités de sous-produits autres que le R30 par recyclage des matières initiales inaltérées, qui contiennent habituellement 0,1 % au maximum de difluorométhane. En outre, la corrosion du réacteur est quasiment nulle lors de la réaction entre un fluorure de chlorure d'antimoine fortement corrosif et le fluorure d'hydrogène, tant que les conditions précitées sont entretenues.

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