초록 ▼

A process is disclosed for the manufacture of CF.sub.3 CHFCF.sub.3 containing less than 0.01 ppm (CF.sub.3).sub.2 C.dbd.CF.sub.2. The process involves (a) contacting hexafluoropropene in the vapor phase at a temperature of less than about 260.degree. C. with hydrogen fluoride in the presence of a se

A process is disclosed for the manufacture of CF.sub.3 CHFCF.sub.3 containing less than 0.01 ppm (CF.sub.3).sub.2 C.dbd.CF.sub.2. The process involves (a) contacting hexafluoropropene in the vapor phase at a temperature of less than about 260.degree. C. with hydrogen fluoride in the presence of a selected fluorination catalyst or produce a product containing less than 10 parts (CF.sub.3).sub.2 C.dbd.CF.sub.2 per million parts of CF.sub.3 CHFCF.sub.3 ; and (b) treating the product of (a) as necessary to remove excess (CF.sub.3).sub.2 C.dbd.CF.sub.2. Suitable catalysts include: (i) an activated carbon treated to contain from about 0.1 to about 10 weight % added alkali or alkaline earth metals, (ii) three dimensional matrix porous carbonaceous materials, (iii) supported metal catalysts comprising trivalent chromium, and (iv) unsupported chrome oxide prepared by the pyrolysis of (NH.sub.4).sub.2 Cr.sub.2 O.sub.7.

대표청구항 ▼

[ What is claimed is:] [1.]1. A process for the manufacture of CF.sub.3 CHFCF.sub.3 containing less than 0.01 ppm (CF.sub.3).sub.2 C.dbd.CF.sub.2, comprising:(a) contacting CF.sub.2.dbd.CFCF.sub.3 in the vapor phase at a temperature of less than about 260.degree. C. with anhydrous hydrogen fluoride

[ What is claimed is:] [1.]1. A process for the manufacture of CF.sub.3 CHFCF.sub.3 containing less than 0.01 ppm (CF.sub.3).sub.2 C.dbd.CF.sub.2, comprising:(a) contacting CF.sub.2.dbd.CFCF.sub.3 in the vapor phase at a temperature of less than about 260.degree. C. with anhydrous hydrogen fluoride in the presence of a fluorination catalyst selected from the group consisting of (i) an activated carbon treated with a soluble salt of alkali or alkaline earth metals to contain from about 0.1 to about 10 weight % added alkali or alkaline earth metals, (ii) three dimensional matrix porous carbonaceous carbon-carbon composite materials, (iii) supported metal catalysts comprising trivalent chromium, and (iv) unsupported chrome oxide catalysts prepared by the pyrolysis of (NH.sub.4).sub.2 Cr.sub.2 O.sub.7, to produce a product containing less than 10 parts (CF.sub.3).sub.2 C.dbd.CF.sub.2 per million parts of CF.sub.3 CHFCF.sub.3 ; and(b) treating the product of (a) as necessary to remove excess perfluoroisobutylene.