Patent ID: 6300530
Filing Date: 2001-10-09
Classification: B01J,C07C

Abstract:
A catalytic fluorination process of halogenated organic compounds with anhydrous gaseous HF characterized in that the catalyst used comprises a supported Cr(III) amorphous compound, characterized in that the support is formed by an aluminum trifluoride (AlF.sub.3) having an high surface area obtainable by fluorination of alumina with gaseous HF having a surface area of at least 150 m.sup.2 /g, characterized in that the alumina is fluorinated with HF at an initial temperature lower than 300.degree. C., the temperature is rised with a temperature gradient.ltoreq.100.degree. C./hour up to the final temperature>320.degree. C. and<450.degree. 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, preferably 1.3 times higher than the stoichiometric, the fluorination being carried out until a fluorinated alumina with a fluorine content not lower than 95% of the stoichiometric is obtained.