Method for producing 1,1-dichloro-3,3,3-trifluoropropane
To provide a method for obtaining 1,1-dichloro-3,3,3-trifluoropropane by reacting 1,1-difluoroethylene with dichlorofluoromethane, which suppresses the production of chloroform as a by-product and achieves a product having a high R-243fa concentration. This method is characterized by obtaining 1,1-dichloro-3,3,3-trifluoropropane by reacting 1,1-difluoroethylene with dichlorofluoromethane in the presence of trifluoromethane.
1. A method for producing 1,1-dichloro-3,3,3-trifluoropropane, which comprises reacting 1,1-difluoroethylene with dichlorofluoromethane in the presence of trifluoromethane, to obtain 1,1-dichloro-3,3,3-trifluoropropane.
2. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 1 , wherein the amount of trifluoromethane used relative to the amount of dichlorofluoromethane used, is from 10 ppm to 10% by molar ratio.
3. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 1 , wherein the amount of trifluoromethane used relative to the amount of 1,1-difluoroethylene used, is from 10 ppm to 10% by molar ratio.
4. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 1 , wherein trifluoromethane is continuously or intermittently supplied to the reaction system.
5. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 1 , wherein trifluoromethane is present in the reactor before initiation of the reaction.
6. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 1 , wherein the ratio of 1,1-difluoroethylene relative to dichlorofluoromethane is from 0.5 to 1.5 by molar ratio.
7. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 1 , wherein the reaction temperature is from −80 to 200° C.
8. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 1 , wherein the reaction is carried out in the presence of a catalyst.
9. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 8 , wherein the catalyst is a Lewis acid catalyst.
10. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 1 , wherein 1,1-dichloro-3,3,3-trifluoropropane and 1,3-dichloro-1,3,3-trifluoropropane are produced by the reaction.
11. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 10 , wherein the proportion of 1,1-dichloro-3,3,3-trifluoropropane relative to the total amount (100 mol %) of 1,1-dichloro-3,3,3-trifluoropropane and 1,3-dichloro-1,3,3-trifluoropropane, is from 50 to 95 mol %.
12. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 1 , wherein the reaction is carried out in a liquid phase.
13. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 12 , wherein the solvent in the reaction system is 1,1-dichloro-3,3,3-trifluoropropane.
14. The method for producing 1,1-dichloro-3,3,3-trifluoropropane according to claim 13 , wherein 1,1-dichloro-3,3,3-trifluoropropane is present in the reactor before initiation of the reaction, so as to form the liquid phase together with 1,1-dichloro-3,3,3-trifluoropropane produced by the reaction.