Process for the preparation of methylchlorosilanes

US5334738A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Bernd Pachaly · Schweich, DE
• Volker Frey · Burghausen, DE
• Herbert Straussberger · Mehring, DE

Key dates

• Filing date: Dec 20, 1993
• Grant date: Aug 2, 1994
• Expiry date: Dec 20, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F7/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Methylchlorosilanes are prepared from silicon and methyl chloride in the presence of a copper catalyst and optionally promoter substances, the production rates of the individual methylchlorosilanes, based on the surface area of the silicon employed, being controlled by the structural parameter QF of the silicon. The structural parameter QF is determined by PA1 (a) cutting up silicon test specimens to form a cut surface. PA1 (b) totaling on the cut surface the areas of the precipitates of intermetallic phases having a longitudinal shape to give an area number A, PA1 (c) totaling on the cut surface the areas of precipitates of intermetallic phases having a circular shape to give an area number B, and PA1 (d) obtaining the quotient of the area number A and the area number B, called the structural parameter QF.