US 6,384,257 B1 · Method for preparing alkyl hydrogeno halosilanes (ahhs) by catalytic hydrogenation

Abstract

The invention concerns the upgrading of a by-product of direct synthesis, namely MeSiCl3, by vapor phase catalytic hydrogenation of said by-product to obtain MeHSiCl2 with greater added value. The invention concerns a method for preparing MeHSiCl2 by catalytic hydrogenation of MeSiCl3 in the presence of a metal catalyst with high selectivity levels in MeHSiCl2 economically and without having recourse to drastic and industrially unsuitable conditions. The invention uses a catalyst comprising a bimetal ruthenium/tin catalytic agent. Said catalytic agent is obtained by reacting ruthenium chloride and tin chloride in an acid medium. In practice, the catalyst is formed by a silica powder support impregnated by the ruthenium/tin catalytic agent.

Claims34

Dependent claims

A process for preparing alkylhydrohalosilanes (ahhs) of formula (I)

R4−m−n SiHmXn (I)
in which
R represents independently a C1-C6 alkyl,
X represents independently a halogen,
m, n are 1 or 2 and m+n≦3
comprising hydrogenating catalytically alkylhalosilanes (ahs) of formula (II):
R(4−f) Xi Xf (II)
where f is 1, 2 or 3
in accordance with the reaction:
R(4−p) Si Xp+H2→R4−m−n SIHmXn+Hm′Xn′
where n′+n=p and m′ is 0 or 1
in the presence of a metallic catalyst,
wherein the metallic catalyst comprises a bimetallic ruthenium/tin catalytic agent.

10 more elements

Dependencies are inferred from the claim text.

Method for preparing alkyl hydrogeno halosilanes (ahhs) by catalytic hydrogenation

Life of this patent

Method for preparing alkyl hydrogeno halosilanes (ahhs) by catalytic hydrogenation

Life of this patent

Abstract

Claims34