Ausimont

Ausimont S.r.l.

Paolo Cuzzato

Letanzio Bragante

Antonio Masiero

Francesco Rinaldi

Sergio Peron

Antonio Pasquale

Francesco Pinna

Ornella Majaron

Arsenio Castellan

A process in gaseous phase to obtain CFC 113 starting from CFC 113, wherein CFC 113, optionally diluted with a gas inert under the reaction conditions, is let flow on a catalyst formed by aluminum fluoride.

Process to obtain CFC 113a from CFC 113

A gaseous process for reducing the amount of chloropentafluoroethane (CFC 115) impurity present in pentafluoroethane (HFC 125) characterized in that pentafluroethane is allowed to flow on a catalyst formed by a trivalent chromium salt, optionally supported, at temperatures in the range 200&deg; C.-400&deg; C., obtaining the reaction of chloropentafluoroethane with pentafluoroethane with formation of hexafluoroethane (FC 116) and tetrafluorochloroethane (HCFC 124).

Process for purifying pentafluoroethane from chloropentafluoroethane

A gaseous process for eliminating chlorine atoms from a chlorofluorocarbon (CFC) of formula C F Cl , wherein n is an integer from 1 to 3 and x&plus;y&equals;2n&plus;2, wherein said compound is reacted with an hydrofluorocarbon of formula C F H , wherein n&prime;, x&prime;, y&prime; are as above defined, in the presence of a fluorination catalyst in solid phase at temperatures in the range 200&deg; C.-400&deg; C.

Process for eliminating chlorine from chlorofluorocarbons

A gaseous process for obtaining pentafluoroethane by dismutation of chlorotetrafluoroethane in the presence of a supported catalyst, said catalyst being formed of a mixture of trivalent chromium oxide with at least an alkaline-earth metal oxide selected from Mg, Ca, Sr and Ba.

Process for obtaining pentafluoroethane by chlorotetrafluoroethane dismutation

Process for preparing aluminum fluoride which comprises fluorination of alumina with gaseous HF, characterized in that the alumina is fluorinated with HF at an initial temperature lower than 300&deg; C., the temperature is raised with a temperature gradient &lE;100&deg; C./hour up to the final temperature >320&deg; C. and <450&deg; C., fluorination is continued at the final temperature until feeding a HF molar amount at least equal to the stoichiometric with respect to the alumina, fluorination being carried out until a fluorinated alumina with a fluorine content not lower than 95% of the stoichiometric is obtained.

Process for preparing aluminum fluoride

A reductive dimerization process of 1,1,1-trifluoro, 2,2,2-trichloroethane (CFC-113a) with hydrogen, with formation of 1,1,1,4,4,4-hexafluoro-2,2,3,3-tetrachlorobutane and 1,1,1,4,4,4-hexafluoro-2,2-dichlorobutene, and mixtures thereof, wherein the catalyst is constituted by metal ruthenium supported on graphitized carbon obtainable by treatment of the carbon at temperatures higher than 2000&deg; C., in inert gas, or aluminum fluoride having an high surface area.

Process for the (CFC-113a) dimerization

A process for obtaining pentafluoroethane HFC 125 by dismutation of gaseous tetrafluorochloroethane HCFC 124, at temperatures in the range 200&deg;-300&deg; C., on a trivalent chromium oxide (Cr,O,) catalyst, supported on aluminum fluoride, by feeding HF in such amount that the HCFC 124/HF molar ratio is in the range 10/1-1/1.

Process for obtaining pentafluoroethane by tetrafluorochloroethane dismutation

In the preparation of 1,1,1-trifluoro-2-chloroethane (HCFC 133,) by means of hydrofluorination in the gas phase of trichloroethylene (TCE) in the presence of a carried catalyst based on Cr,O,it is possible to prolong the catalyst life by feeding to the hydrofluorination reactor, along with trichloroethylene, little amounts (7-25 mols % calculated on the mixture with trichloroethylene) of 133

Process for preparing 1,1,1-trifluoro-2-chloroethane

Catalyst comprising a supported Cr(III) amorphous compound, characterized in that the support is formed by an aluminum trifluoride (AlF,) having an high surface area obtainable by alumina fluorination with gaseous HF at an initial temperature lower than 300&deg; C., the temperature is rised with a temperature gradient&lE;100&deg; C./hour up to the final temperature>320&deg; C. and <450&deg; C., the fluorination is continued at the final temperature until feeding a HF molar amount at least equal to the stoichiometric with respect to the alumina, the fluorination being carried out until a fluorinated alumina with a fluorine content not lower than 95% of the stoichiometric is obtained.

Catalyst for the fluorination of halogenated organic compounds

Process for preparing HCFC-123 with a content of olefins lower than 10 ppm and very small amounts of HCFC-123a and 123b by dismutation of HCFC-124 in gaseous phase by contact with a catalyst which essentially consists of three valence chromium oxide supported on aluminum fluoride, at temperatures in the range 150&deg;-260&deg; C., and with contact times between 5-25 sec.

Process for preparing HCFC-123

Process for preparing pentafluoroethane (HFC-125) wherein 1,1,1-trifluorodichloroethane (HFC-123) is reacted with HF at a temperature from 310&deg; to 380&deg; C., in the presence of a catalyst comprising Cr,O,supported on preformed AlF,. HFC-125 is obtained with high yields (up to 60-70% and over), high conversions (over 80%) and high selectivity, i.e. formation of by-product in very low amounts (5% by moles at most) Moreover, the catalyst maintains a high activity for a long time also with high organic charges.

Process for preparing pentafluoroethane

Perfluoropropene (PFP) hydrofluorination process in gaseous phase to obtain CF,&mdash;CHF&mdash;CF,(A-227ea), characterized in that as catalyst fluorinated alumina containing at least 90% by weight of AlF,, is used, the HF/PFP molar ratios range from about 4:1 to 20:1, the hydrofluorination process temperature being in the range 320&deg;-420&deg; C.

Preparation process of 227

Process for preparing aluminum fluoride having an high surface area and high pore volume comprising the fluorination with HF of alumina having surface area of at least 150 m,/g and pore volume not lower than 0.3 cc/g, said alumina comprising from about 0.5 up to about 15% by weight of silicon oxide.

Process for the preparation of aluminum fluoride

Process for the regeneration of a fluorination catalyst based on Cr(III) compounds optionallay supported comprising a) the treatment at 350.degree. C.-400.degree. C. with an air/inert gas mixture and b) treatment at 300.degree. C.-380.degree. C. with a mixture of an inert gas containing from 1 to 10% by volume of hydrogen.

Process for the regeneration of a catalyst based on trivalent chromium

1,1,1,2-tetrafluoroethane (134a) is prepared by reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane (133a) and hydrofluoric acid with trichloroethylene/133a molar ratios ranging from 5/95 to 50/50, in the presence of a catalyst consisting of Cr.sub.2 O.sub.3 carried on AlF.sub.3. The process provides 134a yields higher than 90% and permits an exceptionally long life of the catalyst. In this way it is possible to realize a continuous process by recycling the unreacted trichloroethylene and 133a, thereby making up for the relatively low global conversion of the reagents.

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Treviso, Italy

Paolo Cuzzato