Patent ID: 6103942
Filing Date: 2000-08-15
Classification: C01B,Y02P

Abstract:
A process for the preparation of silane, comprising the steps of:(a) forming an alcoxysilane product of a metallurgical silicon and alcohol reactant mixture, at an elevated temperature;(b) separating, and then purifying, the alcoxysilane product;(c) reducing and simultaneously oxidizing the purified alcoxysilane, in a second reaction mixture, at a temperature of between -20.degree. C. and 40.degree. C., and for a period of between 1 and 50 hours, in the presence of a catalyst, wherein products of the reaction mixture comprise a gaseous silane, and a liquid including an active portion of the catalyst, tetra-alcoxysilane, and an impurity compound having a silicon-hydrogen bond;(d) purifying the silane by an impurity adsorption;(e) mixing an alcohol and the liquid products of the simultaneous oxidation and reduction reaction;(f) extracting tetra-alcoxysilane from the alcohol and liquid products mixture; and(g) hydrolyzing the tetra-alcoxysilane wherein silica sol and alcohol are produced.