Dow Corning Corporation

Dow Silicones Corporation

Catharine Horner

Aaron Coppernoll

Krishna Janmanchi

Dimitris Katsoulis

Robert Thomas Larsen

A method for preparing a reaction product includes: steps (1) and (2). Step (1) is contacting, at a temperature from 200&#xb0; C. to 1400&#xb0; C., a first ingredient including a silane of formula HRSiX, where subscript a is an integer from 0 to 4, subscript b is 0 or 1, a quantity (a+b)&#x3c;4, each R is independently a monovalent organic group, and each X is independently a halogen atom, with the proviso that when the quantity (a+b)&#x3c;4, then the ingredient further includes H2; with a spinel catalyst including copper; thereby forming a reactant. Step (2) is contacting the reactant with a second ingredient including an organohalide at a temperature from 100&#xb0; C. to 600&#xb0; C.; thereby forming the reaction product and a spent reactant. The reaction product is distinct from the silane used in step (1). The method may be used to prepare diorganodihalosilanes from silicon tetrahalides.

Method for preparing a halosilane

The application relates to a method for preparing organohalosilanes in a two-step process: Steps (i) contacting a copper catalyst with hydrogen gas and halogenated silanes forming a silicon-containing copper catalyst; and Step (ii) contacting said silicon-containing copper catalyst with an organohalide to form the organohalosilane.

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Carrollton, KY, United States of America

Catharine Horner