Manufacture of an alkali metal aluminum halide compound and alkali metal
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United States of America Patent
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Jul 11, 1989
Grant Date -
N/A
app pub date -
Jun 5, 1987
filing date -
Jun 6, 1986
priority date (Note) -
Expired
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Abstract
A method of making an (alkali metal) (metal) halide compound and an alkali metal, the compound having the formula MDHal.sub.x+1 in which D is a metal; M is an alkali metal; Hal is a halide; and x is the valency of the metal D. The compound is made by exposing to one another a molten MDHal.sub.x+1 compound, a metal D and an alkali metal halide having the formula MHal. The MDHal.sub.x+1 compound is separated from a molten alkali metal M by means of a separator which is in contact with both the molten MAlHal.sub.4 and molten alkali metal. The separator can include a solid conductor of ions of the alkali metal or a micromolecular sieve having the alkali metal absorbed therein. A sufficient electrical potential is applied across the electrolytic cell D/MHal/MDHal.sub.x+1 .parallel.separator.parallel.alkali metal to cause the following reactions to take place: xMHal+D.fwdarw.XM+DHal.sub.x and MHal+DHal.sub.x .fwdarw.MDHal.sub.x+1. The alkali metal formed in the first reaction passes through the separator and into the molten alkali metal. The electrical potential is a direct current potential arranged so that electrons are fed via an external circuit into the molten alkali metal.
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