LAH from lithium oxide or hydroxide, says lithium (aluminum) hydride patents.
Another compelling experiment on the to do list.
When lithium hydride is produced in accordance with the invention for use as a reagent in the production of the double hydride of lithium and
aluminum, the reaction mixture may be used as the reagent without previous separation of the lithium hydride. In such case I presently prefer to
employ aluminum as the reducing metal in the reduction of lithium hydroxide.
6. The method of producing lithium hydride which comprises heating anhydrous lithium hydroxide with aluminum in a reaction zone in the absence of air
to a temperature between about 300C to 550C.
8. The method of producing lithium hydride which comprises heating anhydrous lithium hydroxide with magnesium in a reaction zone in the absence of air
to a temperature between 300C to 550C.
+
In accordance with the invention, lithium oxide is reduced in a confined reaction zone and simultaneously converted to lithium hydride by heating with
magnesium in the presence of hydrogen at a temperature, preferably, between 500C to 900C. This results in the production of a mechanically inseparable
mixture of lithium hydride and magnesium oxide. In place of magnesium other reducing materials may be used such as calcium, calcium hydride, silicon,
ferrosilicon, etc. to obtain a mechanically inseparable mixture of lithium hydride and a refractory oxide. I presently prefer, however, to use
magnesium. These products may be crushed easily to powder form.
1. The method which comprises subjecting a mechanically inseparable mixture of lithium hydride and a refractory oxide to the action of a solution of
an aluminum halide in diethyl ether thereby producing a solution of a metal hydride in ether and solid lithium halide, said aluminum halide being
selected from the group consisting of aluminum chloride and aluminum bromide, and separating the solution of metal hydride from the solid lithium
halide, said refractory oxide being the oxide of a solid reducing material capable of being used in the pyrometallurgical reduction of lithium oxide.
Attachment: LiOH_to_LiH_US2450266A.pdf (194kB)
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Attachment: Li2O_to_LAH_US2468260A.pdf (284kB)
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