| US 7,521,574 B2 | ||
| Making of contact mass for organohalosilane preparation and preparation of organohalosilanes | ||
| Mikio Aramata, Gunma-ken (Japan); Hajime Ishizaka, Annaka (Japan); Tetsuya Inukai, Annaka (Japan); and Kenji Saito, Annaka (Japan) | ||
| Assigned to Shin-Etsu Chemical Co., Ltd., Tokyo (Japan) | ||
| Filed on Oct. 18, 2005, as Appl. No. 11/251,862. | ||
| Claims priority of application No. 2004-304223 (JP), filed on Oct. 19, 2004. | ||
| Prior Publication US 2006/0084821 A1, Apr. 20, 2006 | ||
| Int. Cl. C07F 7/16 (2006.01) | ||
| U.S. Cl. 556—472 [423/342] | 9 Claims |
| 1. A method for preparing a contact mass for use in the preparation of phenylchlorosilanes, comprising the steps of
premixing
metallic silicon and
a tin compound selected from the group consisting of a tin halide, a tin nitrate, a tin sulfate, a tin organic acid salt,
and a mixture thereof in a weight ratio that provides 0.1 to 50 parts by weight of metallic tin per 100 parts by weight of
metallic silicon and
0 to 20 parts by weight of a co-catalyst, selected from the group consisting of zinc, antimony, arsenic, and phosphorus and
compounds and alloys thereof, per 100 parts by weight of metallic silicon,
with the proviso that the amount of the co-catalyst is smaller than the amount of tin, and
with the proviso that copper is included as an incidental impurity in the metallic silicon and the catalyst in an amount of
0 to less than 0.05% by weight based on the metallic silicon, and
heat treating the premix in an inert gas atmosphere at a temperature of from 300° C. to 600° C. for from 1 to 10 hours.
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