Process for preparation of silane

Details Process for preparation of silane Process for preparation of silane

C - Chemistry, Metallurgy

01

B

23/196

C01B 33/04 (2006.01) C01F 7/00 (2006.01) C01F 7/54 (2006.01)

Patent

CA 1303817

ABSTRACT OF THE INVENTION PROCESS FOR PREPARATION OF SILANE A continuous method for preparing silane and a co-product by reacting a metal hydride such as NaA1H4 with a silicon halide such as SiF4. 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 (.DELTA.T) so that stoichiometric or substantially stoichiometric operation is achieved. This conserves resources, provides improved co-product and reduces costs.

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