Process for preparing trifluoroacetyl fluoride
AssigneeSolvay SA
InventorsFrank Ebmeyer, Tobias Metzenthin, Gunter Siegemund
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Abstract
The invention relates to the preparation of trifluoroacetyl fluoride by reacting trichloroacetyl chloride with anhydrous hydrogen fluoride in the gaseous phase on a catalyst which is obtainable by reacting a water-soluble chromium (III) salt with magnesium hydroxide or magnesium oxide in the presence of water, converting the reaction mixture into a paste, drying the paste and treating it with hydrogen fluoride.
Claims20
A process for preparing trifluoroacetyl fluoride by reacting trichloroacetyl chloride with anhydrous hydrogen fluoride in the gas phase, which comprises using a chromium- and magnesium-containing catalyst which is obtainable by precipitating out chromium (III) hydroxide by reacting 1 mol of a water-soluble chromium (III) salt with at least 1.5 mol of magnesium hydroxide or magnesium oxide in the presence of water, converting the reaction mixture into a paste which contains chromium hydroxide and a magnesium salt and then drying the paste and treating it with hydrogen fluoride at temperatures of 20.degree. to 500.degree. C.
A process for preparing trifluoroacetyl fluoride by reacting trichloroacetyl chloride with anhydrous hydrogen fluoride in the gas phase, which comprises using a chromium- and magnesium-containing catalyst which contains at least 55% by weight of magnesium fluoride and 0.5 to 29% by weight of chromium, the atomic ratio of magnesium to chromium being between 1.5 to 50.
Dependencies are inferred from the claim text.