Manufacture of porous carbon membranes

US4919860A · kind A · utility

Assignee

• Akzo N.V. · NL

Inventors

• Erich Schindler · Unterweissach, DE
• Franz Maier · Munich, DE

Key dates

• Filing date: Jul 13, 1988
• Grant date: Apr 24, 1990
• Expiry date: Jul 13, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/00801
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a process for making porous carbon membranes and membranes which can made by this process. As starting material, a porous membrane from an acrylonitril-polymer is used. The starting material is pretreated with a hydrazine solution, followed by preoxidation and carbonization. The process enables carbon membranes to be made with selectively adjusted pore sizes and tight pore size distribution. The pore sizes can lie in the ultrafiltration or microfiltration range. The membranes are suitable for separation processes, in which chemically aggressive media are used and for high-temperature processes. They can be used wherever electrical conductivity of the membranes is required.