Method for selecting silicon metalloid having improved performan

Details Method for selecting silicon metalloid having improved performan Method for selecting silicon metalloid having improved performan

1998-07-29

1999-10-26

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

25218232, 25218235, 423111, 423115, 423324, 423348, C07F 716, C09K 300, C01B 3300, C01B 3302

Patent

active

059731770

ABSTRACT:
A method for selecting chemical grade silicon metalloid having improved performance in a direct process for making organohalosilanes. The method comprises (A) heating a chemical grade silicon metalloid sample at a temperature ramp speed controlled to effect a stepwise reduction of oxide impurities present in the chemical grade silicon metalloid to a temperature greater than about 2300.degree. C. in the presence of a carbon source thereby effecting the formation of a reduction product consisting of carbon monoxide and carbon dioxide, (B) determining the amount of the reduction product formed above a temperature of about 1900.degree. C., and (C) selecting a chemical grade silicon metalloid for use in the direct process for making organohalosilanes based upon the amount of the reduction product formed above a temperature of about 1900.degree. C.

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