Membranes based on silicic acid heteropolycondensates and a process for their production

US4505985A · kind A · utility

Assignee

• FRAUNHOFER-GESELSCHAFT · DE

Inventors

• Helmut Schmidt · Riegelsberg, DE
• Alfred Kaiser · Kist, DE
• Horst Scholze · Würzburg, DE

Key dates

• Filing date: May 3, 1983
• Grant date: Mar 19, 1985
• Expiry date: May 3, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31663
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Membranes based on silicic acid heteropolycondensates are produced by hydrolytic polycondensation of at least one silicic acid derivative in the presence of water and, if appropriate, a condensation catalyst, the polycondensation being carried out at the surface of a support, which supports the resulting membrane. The reactants can be fed to the surface of the support via the gas phase or via one or more liquid phases.