Catalytic processes for making hydromonochlorofluorobutane and hydromonochlorofluoropentane compounds
View Patent ↗Disclosed is a process involving contacting a hydrohalobutane selected from the group consisting of CF 2 HCHClCH 2 CCl 2 H, CF 3 CHClCH 2 CCl 2 H, CF 3 CHClCH 2 CCl 3 , CF 3 CClHCHFCCl 2 H and CF 3 CClHCHFCCl 3 , with HF in a reaction zone in the presence of an antimony halide catalyst selected from SbCl 5 and SbF 5 to form a first product mixture containing a hydromonochlorofluorobutane. Also disclosed is a process involving contacting a hydrohalopentane selected from the group consisting of CF 2 HCHClCH 2 CX 2 CX 3 and CF 3 CHClCH 2 CX 2 CX 3 , wherein each X is independently selected from the group consisting of F and Cl, and not all X are fluorines, with HF in a reaction zone in the presence of an antimony halide catalyst selected from SbCl 5 and SbF 5 to form a first product mixture containing a hydromonochlorofluoropentane. A compound of the formula CF 3 CHClCH 2 CHF 2 is also disclosed.
1. A process comprising contacting a hydrohalopentane selected from the group consisting of CF 2 HCHClCH 2 CX 2 CX 3 and CF 3 CHClCH 2 CX 2 CX 3 , wherein each X is independently selected from the group consisting of F and Cl, and not all X are fluorines, with HF in a reaction zone in the presence of an antimony halide catalyst selected from SbCl 5 and SbF 5 to form a first product mixture comprising a hydromonochlorofluoropentane.
2. The process of claim 1 , further comprising recovering the hydromonochlorofluoropentane from the first product mixture.
3. The process of claim 1 wherein the hydrohalopentane is CF 2 HCHClCH 2 CX 2 CX 3 , and the hydromonochlorofluoropentane is CF 2 HCHClCH 2 CF 2 CF 3 .
4. The process of claim 3 wherein the hydrohalopentane is selected from the group consisting of CF 2 HCHClCH 2 CCl 2 CCl 3 , CF 2 HCHClCH 2 CClFCCl 3 , CF 2 HCHClCH 2 CCl 2 CF 3 , CF 2 HCHClCH 2 CClFCF 3 and CF 2 HCHClCH 2 CCl 2 CClF 2 .
5. The process of claim 1 wherein the hydrohalopentane is CF 3 CHClCH 2 CX 2 CX 3 , and the hydromonochlorofluoropentane is CF 3 CHClCH 2 CF 2 CF 3 .
6. The process of claim 5 wherein the hydrohalopentane is selected from the group consisting of CF 3 CHClCH 2 CCl 2 CCl 3 , CF 3 CHClCH 2 CClFCCl 3 , CF 3 CHClCH 2 CCl 2 CF 3 , CF 3 CHClCH 2 CClFCF 3 and CF 3 CHClCH 2 CCl 2 CClF 2 .
7. The process of claim 1 , further comprising dehydrochlorinating the hydromonochlorofluoropentane to form a second product mixture comprising an internal hydrofluoropentene,
wherein said dehydrochlorination step is selected from the group of steps consisting of:
a) pyrolyzing said hydromonochlorofluorobutane at a temperature of between about 500° C. and about 700° C.;
b) dehydrochlorinating hydromonochlorofluorobutane in the presence of a dehydrochlorination catalyst; and,
c) contacting hydromonochlorofluorobutane with a basic aqueous solution.
8. The process of claim 7 wherein the hydromonochlorofluoropentane is CF 3 CHClCH 2 CF 2 CF 3 , and the internal hydrofluoropentene is CF 3 CH═CHCF 2 CF 3 .
9. A process comprising:
contacting a hydrohalobutane with HF in a reaction zone in the presence of an antimony halide catalyst selected from SbCl 5 and SbF 5 to form a first product mixture comprising a hydromonochlorofluorobutane; and,
dehydrochlorinating the hydromonochlorofluorobutane to form a second product mixture comprising an internal hydrofluorobutene,
wherein said dehydrochlorination step is selected from the group of steps consisting of:
a) pyrolyzing said hydromonochlorofluorobutane at a temperature of between about 500° C. and about 700° C.;
b) dehydrochlorinating hydromonochlorofluorobutane in the presence of a dehydrochlorination catalyst; and,
c) contacting hydromonochlorofluorobutane with a basic aqueous solution,
wherein the hydrohalobutane is CF 3 CHClCH 2 CCl 2 H, the hydromonochlorofluorobutane is CF 3 CHClCH 2 CHF 2 , and the internal hydrofluorobutene is CF 3 CH═CHCHF 2 .