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US 9,527,752 B2Granted
Methods for producing aluminum trifluoride
AssigneeSunEdison, Inc.
InventorsPuneet Gupta, Satish Bhusarapu
Life of this patent
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Abstract
Methods for producing aluminum trifluoride by acid digestion of fluoride salts of alkali metal or alkaline earth metal and aluminum, optionally, in the presence of a source of silicon; methods for producing silane that include acid digestion of by-products of silane production to produce aluminum trifluoride.
Claims17
A method for producing aluminum trifluoride, the method comprising:
- contacting a fluoroaluminate feed comprising at least about 30% by weight fluoride salts of alkali metal or alkaline earth-metal and aluminum with substantially anhydrous acid, the fluoride salt being introduced to a fluidized bed reactor which contains acid as a fluidizing gas to produce aluminum trifluoride and at least one by-product;
- wherein the fluoroaluminate feed comprises silicon in an amount less than the stoichiometric molar ratio at which silicon tetrafluoride is produced by reacting silicon with the acid and fluoride salts of alkali metal or alkaline earth-metal and aluminum.
Dependencies are inferred from the claim text.