Method for the preparation of thin-skinned asymmetric reverse osmosis membranes and products thereof

US4456708A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Theodore J. Wydeven · Sunnyvale, US
• Moshe Katz · Nesher, IL

Key dates

• Filing date: Jun 25, 1982
• Grant date: Jun 26, 1984
• Expiry date: Jun 25, 2002

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2325/022
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method for preparing water-insoluble asymmetric reverse osmosis membranes from water-soluble polymers is disclosed. The method involves casting a polymer film, partially drying it and then contacting it with a transition metal polyvalent ion solution. Optionally, the product of the contacting is cross-linked such as by radiation or heat. The membrane products are disclosed as well.