Process for the purification of aluminum chloride
AssigneeToth Aluminum Corporation
InventorsRoger Frank Sebenik, Alfred Lippman
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Abstract
A process is disclosed for collecting and purifying aluminum chloride from gases like those produced from the chlorination of bauxite, clay and other aluminous ores. The method comprises first dissolving the aluminum chloride at about atmospheric pressure in a molten salt solvent in which most of the other principal metal chloride vapors, like SiCl.sub.4 and TiCl.sub.4, are substantially insoluble; then vaporizing and separating the AlCl.sub.3 to produce a purified liquid product. This process eliminates the previous use of costly and/or hazardous compressors and scraped-wall condensers and provides for economical recovery of purified liquid aluminum chloride.
Claims12
In a method for recovering aluminum chloride from a mixed chloride gas containing aluminum chloride and at least one chloride selected from the group consisting essentially of FeCl.sub.3, TiCl.sub.4 and SiCl.sub.4 which comprises contacting said mixed chloride gas at atmosphereic pressure with a liquid solvent in which aluminum chloride is soluble to dissolve the aluminum chloride, and recovering the aluminum chloride from the solvent by distilling the aluminum chloride from the solvent at a pressure sufficient to condense the aluminum chloride as a liquid, the improvement comprising:
- employing as the solvent an inorganic salt mixture selected from the group consisting of NaCl--AlCl.sub.3 --FeCl.sub.3, NaCl--AlCl.sub.3 --FeCl.sub.2, NaCl--AlCl.sub.3 --FeCl.sub.3 --FeCl.sub.2, AlCl.sub.3 --FeCl.sub.3, AlCl.sub.3 --FeCl.sub.2, and AlCl.sub.3 --FeCl.sub.3 --FeCl.sub.2.
Dependencies are inferred from the claim text.