A process is disclosed for making CF3CF=CHF. The process involves reacting CF3CCIFCCI2F with H2 in a reaction zone in the presence of a catalyst to produce a product mixture comprising CF3CF=CHF. The catalyst has a catalytically effective amount of palladium supported on a support selected from the group consisting of alumina, fluorided alumina, aluminum fluoride and mixtures thereof and the mole ratio of H2 to CF3CCIFCCI2F fed to the reaction zone is between about 1 :1 and about 5:1.. Also disclosed are azeotropic compositions of CF3CCIFCCI2F and HF and azeotropic composition of CF3CHFCH2F and HF.
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Page/Page column 15
(2008/06/13)
Electrophilic reactions of fluorocarbons under the action of aluminum chlorofluoride, a potent Lewis acid
A new Lewis acid - aluminum chlorofluoride - was demonstrated to be an effective catalyst for the isomerisation of fluoroolefins, polyfluorinated epoxides and cyclopropanes.At ambient temperature this catalyst converts perfluorobutadiene-1,3 into perfluorobutyne-2 and perfluoro(4-methylpentene-2) into perfluoro(2-methylpentene-2) in nearly quantitative yield.At 100 deg C, aluminum chlorofluoride causes the cleavage of perfluorinated tertiary amines. - Keywords: Electrophilic reactions; Fluorocarbons; Aluminum chlorofluoride; Lewis acid; NMR spectroscopy
Petrov, V. A.,Krespan, C. G.,Smart, B. E.
p. 138 - 142
(2007/10/03)
HALOGEN EXCHANGE EQUILIBRIA OF CHLOROFLUOROOLEFINS
The thermochemical properties of the following reactions were determined using either AlF3 or Cr2O3 as catalysts: (1) (2) (3) In addition, the cis-trans equilibria of both CF3CF=CFCl and CF3CCl=CFCl were able to be derived from the reaction data.The experimental thermochemical properties for reactions (1), (2) and (3) were compared with property values calculated using a well-known approximation method.A study of the exchange equilibria of chlorofluoroethylenes failed to yield accurate thermochemical values due to significant side reactions.However, a brief study of the mechanism of a catalytic disproportionation of CF2=CFCl: was carried out.
Coulson, D. Robert
p. 77 - 87
(2007/10/02)
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