Process of producing hydrogen fluoride

Details Process of producing hydrogen fluoride Process of producing hydrogen fluoride

C - Chemistry, Metallurgy

01

B

23/180

C01B 7/19 (2006.01) B01J 8/18 (2006.01)

Patent

CA 1135477

ABSTRACT OF THE DISCLOSURE: This invention relates to an improved process for the production of hydrogen fluoride. In this process, waste materials, particularly waste materials from the electrolytic production of aluminum, such as lining material broken out of the electrolytic cell, are contacted with steam at about 1000 to 1350°C for a recovery of hydrogen fluoride by pyrohy- drolysis in a expanded fluidized bed. The exhaust gas from the pyrohyclrolytic treatment are then cooled in such a manner that it is not increased in quantity and accordingly that the relatively low hydrogen fluoride concentration is not decreased further. In accordance with the invention the exhaust gas is cooled by direct contact with solids which are subsequently recooled in a cooler in which their contact heat is recovered. The exhaust gas and cooling solids are prefe- rably contacted in a suspension-type heat exchanger and the solids are preferably recooled in a multistage fluidized bed cooler.

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