Process for the preparation of aluminum fluoride
AssigneeAusimont S.p.A.
InventorsPaolo Cuzzato, Letanzio Bragante, Francesco Rinaldi
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Abstract
Process for preparing aluminum fluoride having an high surface area and high pore volume comprising the fluorination with HF of alumina having surface area of at least 150 m2/g and pore volume not lower than 0.3 cc/g, said alumina comprising from about 0.5 up to about 15% by weight of silicon oxide.
Claims2
A process for preparing aluminum fluoride having an essentially gamma crystalline structure, a surface area of at least 25 m2/g, a pore volume higher than 0.20 cm3/g as determined by mercury injection at high pressure, and a fluorine content of at least 95% by weight of the stoichiometric value of fluorine in aluminum fluoride, the process comprising fluorinating alumina with gaseous HF at a temperature higherthan 300° to 400° C., wherein the gaseous HF is diluted with an inert gas and has a partial pressure of between 0.1 and 0.5, and wherein the alumina has a surface area of at least 150 m2/g and comprises from 1 to 10% by weight of silicon oxide.
Dependencies are inferred from the claim text.