Continuous process for preparing silanes and siloxanes having SiOC groups

US4298753A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Anton Schinabeck · Burghausen, DE
• Norbert Zeller · Burghausen, DE
• Tassilo Lindner · Mehring, DE
• Georg Engelsberger · Ach, AT
• Rudolf Riedle · Burghausen, DE

Key dates

• Filing date: Nov 24, 1980
• Grant date: Nov 3, 1981
• Expiry date: Nov 24, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A continuous process for preparing silanes and siloxanes having SiOC groups which comprises (a) introducing in a liquid phase a chlorosilane and a hydroxyl-containing aliphatic compound in parallel flow into a first stage of a first reactor in an amount such that from 0.5 to 0.9 gram-mole of hydroxyl group is present per gram-atom of Si-bonded chlorine; (b) removing the liquid reaction mixture from the first reactor; (c) introducing the reaction mixture at the head of a column used as the second reactor which is maintained at an elevated temperature; (d) adding a hydroxyl-containing aliphatic compound as a gas at the lower end of the column or at a point between the lower end and the upper end of the lower one-third of the column, in an amount at least sufficient to completely react with the Si-bonded chlorine present in the reaction mixture obtained from the first stage and (e) removing the silane containing SiOC groups or polysiloxane containing SiOC groups from the column at a point below the point of addition of the hydroxyl-containing aliphatic compound.