Method for producing silanes

US7323155B2 · kind B2 · utility

Assignee

• SOLARWORLD AG · DE

Inventors

• Stephan Klein · Mettmann, DE
• Hans-Dieter Block · Cologne, DE
• Hans-Joachim Leimkühler · Leverkusen, DE
• Werner Dick · Leverkusen, DE
• Dirk Müller · Essen, DE
• Johannes-Peter Schafer · Lingen (Ems), DE

Key dates

• Filing date: Nov 9, 2001
• Grant date: Jan 29, 2008
• Expiry date: Jun 10, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a method of producing silane or hydrochlorosilanes by disproportionation of a higher chlorinated hydrochlorosilane or a mixture of said hydrochlorosilanes in the presence of a catalyst. Before the catalyst is used, it is a) washed with hyper-pure water in one or several steps; b) transferred in the water-moist state to the reactor in which the disproportionation is to proceed; c) treated in the reactor with boiling methanol or rinsed with anhydrous methanol; and d) the methanol is removed from the catalyst by evacuation and/or stripping with inert gas. The invention further relates to a method for treating disproportionation catalysts.