Patent ID: 7179933
Filing Date: 2007-02-20
Classification: C07F

Abstract:
1. A process for preparing organohalosilanes having the general formula (I): wherein R is a monovalent hydrocarbon group of 1 to 12 carbon atoms, X is a halogen atom, k is an integer of 1 to 3, m is an integer of 0 to 2, and the sum of k+m is 1 to 3, by reacting metallic silicon particles with an organohalide in the presence of a copper-containing catalyst, wherein a contact mass is composed of (i.) the metallic silicon and (ii.) a copper-containing catalyst component comprising metallic copper or a copper compound and optionally a co-catalyst selected from the group consisting a metallic zinc, zinc compounds, metallic tin, tin compounds, metallic antimony, antimony compounds, metallic aluminum, aluminum compounds, metallic phosphorus, and phosphorus compounds and (iii.) an effective amount of a catalyst alloy, containing 0.2 to 8% by weight of tin, 4 to 20% by weight of phosphorus, and the balance of copper, which is powdered by atomization.