| 摘要 |
<p>Disclosed is a continuous catalytic process for the preparation of hexafluoroacetone comprising reacting in a first fluorination step a mixture of hydrofluoric acid and a chlorofluoroacetones recyclate, then in a second fluorination step, a mixture containing the effluent issuing from the first step and fresh hexachlorofluoroacetone, on a catalyst comprising gamma alumina impregnated with chromium sesquioxide Cr2O3 in an amount of 1.5 to 4 atoms of chromium per liter of alumina and activated between 300 DEG C. and 400 DEG C. by means of a mixture of hydrofluoric acid and 1,1,2-trichloro-1,2,2-trifluoro-ethane.</p> |
