Loading patent…
AssigneeE.I. du Pont de Nemours and Company
InventorsMario Joseph Nappa, Velliyur Nott Mallikarhjuna Rao, Allen Capron Sievert, Jeffrey P. Knapp
Estimating the term…
Halocarbons of the structure CF3CF2CH2X, wherein X is either F or Cl or mixtures thereof prepared by: contacting at least one 2-fluorochloropropane with hydrogen fluoride in a first fluorination step in the gas phase or liquid phase under substantially anhydrous conditions, in the absence of added catalyst to partially fluorinate said 2-fluorochloropropane; contacting said partially fluorinated 2-fluorochloropropane with at least the stoichiometric molar equivalent of hydrogen fluoride under substantially anhydrous conditions, in the presence of at least one fluorination catalyst in a second fluorination step; removing said reaction products from contact with said catalyst, and isolating a substantial yield of at least 1,1,1,2,2,3-hexafluoropropane or 1,1,1,2,2, penta-3-chloropropane, or mixtures thereof, respectively.
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
An azeotropic or near-azeotropic composition comprising 1,1,1,2,2-pentafluoro-3-chloropropane, and hydrogen fluoride.
The azeotropic composition of 12 comprising from about 17.3 mole percent to about 34.9 mole percent 1,1,1,2,2-pentafluoro-3-chloropropane and mole percent hydrogen fluoride.
A process for the separation of 1,1,1,2,2-pentafluoro-3-chloropropane from a mixture comprising an azeotropic or near-azeotropic composition of 1,1,1,2,2-pentafluoro-3-chloropropane and hydrogen fluoride, said process comprising:
Dependencies are inferred from the claim text.