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US 5,663,478 AGranted
Recovery of aluminum and/or fluoride values from used aluminum chlorofluorides
AssigneeE.I. du Pont de Nemours and Company
InventorsWilliam Henry Gumprecht, William Joel Huebner
Life of this patent
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Abstract
A process is disclosed for treating used aluminum chlorofluoride catalyst either alone or mixed with organics. It involves forming a solution of the catalyst in water or an aqueous acid and then adjusting the pH and/or composition of the aqueous phase formed to precipitate compounds containing the aluminum and/or fluorine.
Claims10
A process for treating used aluminum chlorofluoride catalyst comprising
- mixing the used aluminum chlorofluoride catalyst with water or an aqueous acid to form an aqueous solution,
- adjusting the pH of the aqueous solution to precipitate and alkali metal aluminum fluoride or an ammonium aluminum fluoride from the aqueous solution, and
- separating the precipitated alkali metal aluminum fluoride or ammonium aluminum fluoride from the aqueous solution.
A process for treating a mixture of used aluminum chlorofluoride catalyst and organics comprising
- mixing the organics and used aluminum chlorofluoride catalyst with water or an aqueous acid to form an organic phase and an aqueous phase,
- separating the organic phase from the aqueous phase,
- adjusting the pH of the aqueous phase to precipitate an alkali metal fluoride or ammonium aluminum fluoride from the aqueous phase, and
- separating the precipitated alkali metal fluoride or ammonium aluminum fluoride from the aqueous phase.
1 more element
A process for treating used aluminum chlorofluoride catalyst comprising
- mixing the used aluminum chlorofluoride catalyst with water or an aqueous acid to form an aqueous solution,
- adding a source of calcium with simultaneous or subsequent addition of an alkali to facilitate the precipitation of a calcium fluoride.
Dependencies are inferred from the claim text.