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Inventor:
Cuzzato; Paolo
Address:
Treviso, IT
No. of patents:
26
Patents:












Patent Number Title Of Patent Date Issued
6791001 Process to obtain CFC 113a from CFC 113 September 14, 2004
A process in gaseous phase to obtain CFC 113a 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.
6512150 Process for purifying pentafluoroethane from chloropentafluoroethane January 28, 2003
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
6479717 Process for eliminating chlorine from chlorofluorocarbons November 12, 2002
A gaseous process for eliminating chlorine atoms from a chlorofluorocarbon (CFC) of formula C.sub.n F.sub.x Cl.sub.y, wherein n is an integer from 1 to 3 and x+y=2n+2, wherein said compound is reacted with an hydrofluorocarbon of formula C.sub.n' F.sub.x' H.sub.y', wherein n', x', y'
6437200 Process for obtaining pentafluoroethane by chlorotetrafluoroethane dismutation August 20, 2002
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.
6436362 Process for preparing aluminum fluoride August 20, 2002
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.degree. C., the temperature is raised with a temperature gradient .ltoreq.100.degree. C./
6348634 Process for the (CFC-113a) dimerization February 19, 2002
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 ru
6323379 Process for obtaining pentafluoroethane by tetrafluorochloroethane dismutation November 27, 2001
A process for obtaining pentafluoroethane HFC 125 by dismutation of gaseous tetrafluorochloroethane HCFC 124, at temperatures in the range 200.degree.-300.degree. C., on a trivalent chromium oxide (Cr.sub.2 O.sub.3) catalyst, supported on aluminum fluoride, by feeding HF in such amou
6307114 Process for preparing 1,1,1-trifluoro-2-chloroethane October 23, 2001
In the preparation of 1,1,1-trifluoro-2-chloroethane (HCFC 133a) by means of hydrofluorination in the gas phase of trichloroethylene (TCE) in the presence of a carried catalyst based on Cr.sub.2 O.sub.3 it is possible to prolong the catalyst life by feeding to the hydrofluorination react
6300529 Process for preparing HCFC-123 October 9, 2001
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
6232514 Process for preparing pentafluoroethane May 15, 2001
Process for preparing pentafluoroethane (HFC-125) wherein 1,1,1-trifluorodichloroethane (HFC-123) is reacted with HF at a temperature from 310.degree. to 380.degree. C., in the presence of a catalyst comprising Cr.sub.2 O.sub.3 supported on preformed AlF.sub.3. HFC-125 is obtained wi
6187975 Preparation process of 227 February 13, 2001
Perfluoropropene (PFP) hydrofluorination process in gaseous phase to obtain CF.sub.3 --CHF--CF.sub.3 (A-227ea), characterized in that as catalyst fluorinated alumina containing at least 90% by weight of AlF.sub.3, is used, the HF/PFP molar ratios range from about 4:1 to 20:1, the hyd
6187280 Process for the preparation of aluminum fluoride February 13, 2001
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.sup.2 /g and pore volume not lower than 0.3 cc/g, said alumina comprising from about 0.5 up to about 15% by weight
6150572 Process for the regeneration of a catalyst based on trivalent chromium compounds November 21, 2000
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
6037508 Process for preparing 1,1,1,2-tetrafluoroethane March 14, 2000
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 ca
5981813 Fluorination process of halogenated organic compounds November 9, 1999
Fluorination process of halogenated organic compounds with gaseous anhydrous HF characterized in that a catalyst comprising a supported Cr(III) amorphous compound is used, wherein the support consists in an aluminum trifluoride (AlF.sub.3) having an high surface area and an high pore
5919728 Catalyst for the fluorination of halogenated hydrocarbons July 6, 1999
A fluorination catalyst based on of an amorphous Cr (III) compound and on a compound of another metal selected from Mg, Ca, Sr, Ba, Sc, Ti and Zr, wherein the atomic ratio of Cr/other metal is between 50:1 and 1:1, said compounds are supported on a AlF.sub.3 support and being prepared by
5880316 Process for preparing 1,1,1,2-tetrafluoroethane March 9, 1999
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 ca
5841006 Process for preparing pentafluoroethane November 24, 1998
Process for preparing pentafluoroethane (125) containing amounts of 115 lower than 0.02% by weight wherein pentafluoroethane is obtained by a dismutation process of tetrafluorochloroethane CF.sub.3 CHClF (HCFC-124) in gaseous phase in the presence of a chrome oxide catalyst (CR.sub.2
5817895 Process for the regeneration of a catalyst based on trivalent chromium compounds October 6, 1998
Process for the regeneration of a fluorination catalyst based on Cr(III) compounds optionally supported, which comprise a) treatment at 350.degree.-40.degree. C. with an air/inert gas mixture and b) treatment at 300.degree.-380.degree. C. with a mixture of an inert gas containing fro
5608125 Process for preparing 1,1,1,2-tetrafluoroethane March 4, 1997
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 ca
5600037 Process for isomerizing 1,1,2-trifluoro-1,2-dichloroethane to 1,1,1-trifluoro-2,2-dichloroethane February 4, 1997
1,1,2-trifluoro-1,2-dichloroethane (Al23a) is isomerized to 1,1,1-tri-fluoro-2,2-dichloroethane (Al23) by contacting it with AlF.sub.3 at temperatures ranging from 180.degree. to 400.degree. C. Advantageously, it is operated with mixtures of Al23a with Al23 and/or other chlorofluoroc
5563305 Process for purifying 1,1,1-trifluoro-2-fluoroethane October 8, 1996
1,1,1-trifluoro-2-fluoroethane (CFC 134a) is purified from 1,1-difluoro-2-chloroethylene (CFC 1122) by reacting a mixture comprising said compounds with hydrofluoric acid, at temperatures from 200.degree. C. to 450.degree. C., in one presence of chrome oxide (Cr.sub.2 O.sub.3) in sub
5475168 Process for purifying 1,1,1-trifluoro-2-fluoroethane December 12, 1995
1,1,1-trifluoro-2-fluoroethane (CFC 134a) is purified from 1,1-difluoro-2-chloroethylene (CFC 1122) by reacting a mixture comprising said compounds with hydrofluoric acid, at temperatures from 200.degree. C. to 450.degree. C., in the presence of chrome oxide (Cr.sub.2 O.sub.3) in sub
5463151 Process for preparing 1,1,1,2-tetrafluoroethane October 31, 1995
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 ca
5414167 Process for purifying 1,1,1-trifluoro-2,2-dichloroethane from isomer 1,1,2-trifluoro-1,2-dichlor May 9, 1995
The 1,1,2-trifluoro-1,2-dichloroethane content is reduced or removed from 1,1,1-trifluoro-2,2-dichloroethane by contacting a gaseous mixture comprising said compounds with chrome oxide (Cr.sub.2 O.sub.3) either as such or supported, at temperatures from 180.degree. to 400.degree. C.
5345014 Process for preparing pentafluoroethane by dismutation of tetrafluorochloroethane September 6, 1994
Pentafluoroethane (HFC 125) is selectively prepared by dismutation of tetrafluorochloroethane (HCFC 124) effected by contacting the latter, in the gas phase, with a Cr.sub.2 O.sub.3 catalyst at temperatures ranging from 150.degree. to 330.degree. C. Along with HFC 125, also HCFC 123










 
 
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