Catalytic gas phase fluorination of 1,1,2-trichloroethane and/or 1,2-dichloroethene to produce 1-chloro-2,2-difluoroethane
View Patent ↗The invention is directed to a catalyst for the gas phase fluorination of 1,1,2-trichloroethane and/or 1,2-dichloroethene with HF to give 1-chloro-2,2-difluoroethane which catalyst is prepared by co-depositing FeCl 3 and MgCl 2 on chromia-alumina, or co-depositing Cr(NO 3 ) 3 and Ni(NO 3 ) 2 on active carbon, or by doping alumina with ZnCl 2 , and to a process for the preparation of 1-chloro-2,2-difluoroethane comprising a catalytic gas phase fluorination of 1,1,2-trichloroethane and/or 1,2-dichloroethene wherein one of the catalysts according to claim 2 or 3 is used.
1. A process for preparation of 1-chloro-2,2-difluoroethane comprising a catalytic gas phase fluorination of 1,1,2-trichloroethane comprising using a catalyst which is prepared by co-depositing FeCl 3 and MgCl 2 on chromia-alumina and which has been fluorinated by treating the catalyst with a fluorine containing activation agent at a temperature not exceeding 400° C.
2. The process according to claim 1 , wherein the catalyst has been fluorinated by HF as activation agent.
3. A process for preparation of 1-chloro-2,2-difluoroethane comprising a catalytic gas phase fluorination of 1,2-dichloroethene comprising using a catalyst which is prepared by co-depositing FeCl 3 and MgCl 2 on chromia-alumina and which has been fluorinated by treating the catalyst with a fluorine containing activation agent at a temperature not exceeding 400° C.
4. A process for preparation of 1-chloro-2,2-difluoroethane comprising a catalytic gas phase fluorination of 1,1,2-trichloroethane and 1,2-dichloroethene, comprising using a catalyst which is prepared by co-depositing FeCl 3 and MgCl 2 on chromia-alumina and which has been fluorinated by treating the catalyst with a fluorine containing activation agent at a temperature not exceeding 400° C. and wherein 1,1,2-trichloroethane and 1,2-dichloroethene are fed separately to a reactor.
5. The process according to claim 1 , wherein contact time is in a range from 10 to 200 seconds.
6. The process according to claim 1 , wherein reaction temperature is in a range from 200° C. to 350° C.
7. The process according to claim 3 , wherein the catalyst has been fluorinated by HF as activation agent.
8. The process according to claim 4 , wherein the catalyst has been fluorinated by HF as activation agent.
9. The process according to claim 3 , wherein contact time is in a range from 10 to 200 seconds.
10. The process according to claim 3 , wherein reaction temperature is in a range from 200° C. to 350° C.
11. The process according to claim 4 , wherein contact time is in a range from 10 to 200 seconds.
12. The process according to claim 4 , wherein reaction temperature is in a range from 200° C. to 350° C.