Process for converting Si-H compounds to Si-halogen compounds

Abstract

The invention provides a process for converting silicon compounds (H) which have Si-H bonds to silicon compounds (Cl) which have Si-halogen bonds, in which the silicon compounds (H) are reacted in the gas phase with hydrogen halide in the presence of catalysts which are selected from (a) tetraorganophosphonium halides, (b) tetraorganoammonium halides and (c) ionic halides of heterocycles with organic substitution on the heteroatom.

Description

technical field [0001] The present invention relates to a process for converting Si-H compounds into Si-halogen compounds using hydrogen halides in the gas phase. Background technique [0002] In the preparation of halosilanes or organohalosilanes, mixtures which also comprise Si—H-containing silanes are often produced. The silane may be desired and may be isolated from the mixture in pure form. But it can also be undesired and must therefore be removed. The most common method used to separate silane mixtures is distillation. If the Si—H-containing silane and one or more other silanes now boil very close together or even form azeotropes, the distillation becomes complicated and expensive. [0003] US 5,336,799 A describes the conversion of Si—H-containing compounds to the corresponding organosilanes by reaction with organohalides over Pt or Pd catalysts. The reaction is slow and requires relatively expensive organic halides. [0004] EP 423 948 A describes the reaction ...

AI Technical Summary

Problems solved by technology

Catalysts are expensive and deactivation occurs due to slow oxidation to metal halides

[0005] US 5,302,736A describes Ag or Au catalysts for this purpose, but the reaction proceeds too slowly

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