Cross flow microfilter

US4797211A · kind A · utility

Assignee

• Kernforschungszentrum Karlsruhe GmbH · DE

Inventors

• Wolfgang Ehrfeld · Karlsruhe, DE
• Dietrich Munchmeyer · Blankenloch, DE

Key dates

• Filing date: Dec 24, 1986
• Grant date: Jan 10, 1989
• Expiry date: Dec 24, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/00909
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A cross flow microfilter comprises a filter housing having a flow chamber wherein a fluid is introduced on one side and a concentrate is removed on the opposite side a collection chamber from which a filtrate is removed, and at least one microporous membrane over whose one surface the fluid to be filtered flows in a parallel stream and whose other surface is oriented toward the collection chamber, the membrane having pores of a width between about 0.1 micron and 30 micron, the improvement wherein the pores of the membrane have slit-shaped cross-sections and given profiles, and are formed by a plurality of webs arranged in rows with predetermined spacing and by terminating plates which cover the webs, and the webs are applied onto one of the two plates by X-ray lithographic means, X-ray depth lithographic-galvanoplastic means, or molding and galvanoplastic means.