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US 12,643,844 B2Granted
Catalyst and process using the catalyst
AssigneeMexichem Amanco Holdings S.A. De C.V.
InventorAndrew P. Sharratt
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Abstract
A new chromium-containing fluorination catalyst is described. The catalyst comprises an amount of zinc that promotes activity and from 0.1 to 8.0% by weight of the chromium in the catalyst based on the total weight of the chromium is present as chromium (VI). The use of the zinc-promoted, chromium-containing catalyst in a fluorination process in which a hydrocarbon or halogenated hydrocarbon is reacted with hydrogen fluoride in the vapour-phase at elevated temperatures is also described.
Claims20
A method for preparing a chromium-containing fluorination catalyst, comprising:
- adding an aqueous solution of one or more zinc compounds and chromium (III) compounds to a tank;
- adding an aqueous solution of hydroxide to the tank while agitating the tank to provide a slurry of a precipitate mixture of zinc hydroxide and chromium (III) hydroxide;
- isolating the precipitate mixture from the slurry;
- washing the precipitate mixture;
- and
- calcining the precipitate mixture to provide the fluorination catalyst;
- wherein the fluorination catalyst comprises chromium (III) in an amount of from 92.0 to 99.5% by weight of a total weight of chromium in the fluorination catalyst and chromium (VI) in an amount of from 0.1 to 8.0% by weight of the total weight of chromium in the fluorination catalyst.
4 more elements
Dependencies are inferred from the claim text.