Synthesis of hexafluoropropylene
View Patent ↗The present invention relates to the process of pyrolyzing tetrafluoroethylene to hexafluoropropylene by carrying out the pyrolysis in a tubular reactor that is lined with either nickel or nickel alloy which contains no greater than 8 wt % chromium.
1. Process for pyrolyzing tetrafluoroethylene to hexafluoropropylene, comprising carrying out said pyrolyzing in a reaction zone lined with mechanically supported (a) nickel or (b) nickel alloy containing up to 8 wt % chromium.
2. The process of claim 1 wherein said pyrolyzing is carried out in the absence of hydrogen.
3. The process of claim 1 wherein said pyrolyzing is carried out at a temperature of 700° to 900° C.
4. The process of claim 3 wherein the temperature is 775° C. to 850° C.
5. The process of claim 3 wherein the temperature is 825° C. to 845° C.
6. The process of claim 1 wherein said reaction zone is in the shape of a helix.
7. The process of claim 1 wherein the volume of said reaction zone is at least 0.04 m 3 .
8. The process of claim 1 wherein the lining of said reaction zone is nickel.
9. The process of claim 1 wherein the temperature is 830° C. to 845° C.
10. The process of claim 1 wherein said nickel (a) contains no greater than 0.02 wt % carbon.
11. The process of claim 1 wherein said pyrolyzing is carried out with octafluorocyclobutane and said tetrafluoroethylene being co-fed to said reaction zone.