Process for preparation of silane

Chemistry of inorganic compounds – Silicon or compound thereof – Binary compound

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423463, 423495, 423499, 423DIG5, 423DIG6, C01B 3304, C01B 900, C01F 300, C01D 300

Patent

active

048470619

ABSTRACT:
A continuous method for preparing silane and a co-product by reacting a metal hydride such as NaAlH.sub.4 with a silicon halide such as SiF.sub.4. The method involves a reactor loop comprising a primary reactor, a secondary reactor and a separation zone. Most of the metal hydride is reacted in the first reactor to which it is added in a substantially constant rate. The remainder of the hydride is reacted in the secondary reactor, in which all or substantially all of the silicon halide is added. The rate of silicon halide addition is governed by feed back from the reaction in the secondary reactor, (.rarw.T so that stoichiometric or substantially stoichiometric operation is achieved. This conserves resources, provides improved co-product and reduces costs.

REFERENCES:
patent: 4407783 (1983-10-01), Ulmer
patent: 4601798 (1986-07-01), Jacubert et al.
patent: 4632816 (1986-12-01), Marlett
Wherry et al, Process Instrumentation Manual.
Padam, J. of Fluorine Chemistry 14 (1979) 327-329.

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