Purification of aluminum chloride
AssigneeToth Aluminum Corporation
InventorsRoger Frank Sebenik, Alfred Lippman
Life of this patent
Estimating the term…
Abstract
A process for purifying aluminum chloride gas such as that produced in the chlorination of bauxite, clay and other aluminous ores is disclosed. The method first selectively dissolves or liquefies AlCl.sub.3 from an anhydrous mixture of gaseous metal chlorides which may also include the chlorides of Si, Ti, Fe and other metals. More specifically, the method of the present invention provides for selectively dissolving AlCl.sub.3 vapor at substantially atmospheric pressure without the use of costly or hazardous compressors, or the scraped-wall condensers formerly required for this purpose. In addition, the present method allows for economical recovery of the liquefied AlCl.sub.3.
Claims13
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 atmospheric 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.
Dependencies are inferred from the claim text.