Fluoroolefin manufacturing process
AssigneeE. I. Du Pont de Nemours and Company
InventorsRao V.N. Mallikarjuna, Munirpallam A. Subramanian
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Abstract
This invention provides a process for the manufacture of a fluoroolefin of the formula (R.sup.1).sub.2 C.dbd.C(R.sup.1).sub.2 wherein each R.sup.1 is independently selected from the group consisting of --H, --F, --CF.sub.3, --CHF.sub.2, --CH.sub.2 F, --C.sub.2 F.sub.5, --C.sub.2 HF.sub.4 and --C.sub.2 H.sub.2 F.sub.3, provided that at least one R.sup.1 is not --H. The process comprises contacting a hydrofluorocarbon of the formula (R.sup.1).sub.2 CHCF(R.sup.1).sub.2 with a catalyst comprising cubic chromium trifluoride, i.e., a chromium trifluoride having an X-ray diffraction powder pattern shown in Table I, at a temperature of from about 200.degree. C. to about 500.degree. C.
Claims5
A process for the manufacture of a fluoroolefin of the formula (R.sup.1).sub.2 C.dbd.C(R.sup.1).sub.2 wherein each R.sup.1 is independently selected from the group consisting of --H, --F, --CF.sub.3, --CHF.sub.2, --CH.sub.2 F, --C.sub.2 F.sub.5, --C.sub.2 HF.sub.4 and --C.sub.2 H.sub.2 F.sub.3, provided that at least one R.sup.1 is not --H, comprising:
- contacting a hydrofluorocarbon of the formula (R.sup.1).sub.2 CHCF(R.sup.1).sub.2 with a catalyst at temperature of from about 200.degree. C. to about 500.degree. C., said catalyst comprising cubic chromium trifluoride having the following X-ray diffraction powder pattern.
- ______________________________________ Relative d spacing (.ANG.) intensty H K L ______________________________________ 5.8888 VS 1 1 1 3.0674 S 3 1 1 2.9432 M 2 2 2 2.0818 W 4 2 2 1.9547 W 5 1 1 1.7991 M7 4 4 0. ______________________________________
Dependencies are inferred from the claim text.