Back to results
US 5,679,875 AGranted
Method for manufacturing 1,1,1,2,3-pentafluoropropene 1,1,1,2,3-pentafluoropropane
AssigneeDaikin Industries, Ltd.
InventorsHirokazu Aoyama, Eiji Seki
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeDaikin Industries, Ltd.
InventorsHirokazu Aoyama, Eiji Seki
Estimating the term…
The present inventions provide manufacturing methods of 1,1,1,2,3-pentafluoropropene characterized by the reaction of removing HF by means of the contact of 1,1,1,2,3,3-hexafluoropropane in the gas state with active carbon or active carbon added with metallic salt. 1,1,1,2,3-pentafluoropropene can be produced from easily available 1,1,1,2,3,3-hexafluoropropane by cost-effective industrial methods at high yields according to these inventions. The inventions also provide manufacturing methods of 1,1,1,2,3-pentafluoropropane characterized by reducing 1,1,1,2,3-pentafluoropropene with hydrogen under the presence of a hydrogenation catalyst consisting of palladium added with one or more of silver, copper, gold, tellurium, zinc, chromium, molybdenum, and thallium or under the presence of a rhodium catalyst. The desired product can be produced at high reactivities and high selectivities according to these inventions.
A method for producing 1,1,1,2,3-pentafluoropropene by the selective removal of hydrogen fluoride from 1,1,1,2,3,3-hexafluoropropane which comprises contacting gaseous 1,1,1,2,3,3-hexafluoropropane with active carbon.
A method for producing 1,1,1,2,3-pentafluoropropene by the selective removal of hydrogen fluoride from 1,1,1,2,3,3-hexafluoropropane which comprises contacting gaseous 1,1,1,2,3,3-hexafluoropropane with trivalent chromium oxide or partially fluorinated trivalent chromium oxide.
A method for preparing 1,1,1,2,3-pentafluoropropane which comprises contacting gaseous 1,1,1,2,3,3-hexafluoropropane with active carbon, trivalent chronium oxide or partially fluorinated trivalent chronium oxide, to selectively remove hydrogen fluoride from the 1,1,1,2,3,3-hexafluoropropane to form 1,1,1,2,2,3-pentafluoropropene;
A method for preparing 1,1,1,2,3-pentafluoropropane which comprises reacting 1,1,1,2,3-pentafluoropropene in the vapor phase with hydrogen in the presence of a rhodium catalyst.
Dependencies are inferred from the claim text.