Separation of methylchlorosilanes from high boiling residues of methylchlorosilane synthesis

US5288892A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Bernd Pachaly · Schweich, DE
• Anton Schinabeck · Burghausen, DE

Key dates

• Filing date: Apr 19, 1993
• Grant date: Feb 22, 1994
• Expiry date: Apr 19, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F7/128
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for separating methylchlorosilanes from high boiling residues from the methylchlorosilane synthesis, in which cleavable methylchlorodisilanes which are present in the residues and which have at least two chlorine atoms attached to one silicon atom are cleaved with hydrogen chloride in the presence of a catalyst which remains in the reaction mixture, which comprises cleaving the methylchlorodisilanes in the presence of by-products which are more volatile than the cleavable methylchlorodisilanes in the high boiling residues from the methylchlorosilane synthesis which have a boiling point of at least 70.degree. C. under normal conditions and continuously removing the more volatile by-products from the reaction mixture along with the methylchlorosilanes and the noncleavable methylchlorodisilanes.