Bend Research, Inc.

The United States of America As Represented by the Secretary of

Robert P Barss

Dwayne Thomas Friesen

Scott B McCray

James William West

Roderick Jack Ray

Kendall R Pearson

Delores R Sidwell

Richard W Baker

Leslie D Nelson

Solvent-resistant polybenzimidazole membranes, methods of making them and crosslinking them and composite membranes and hollow fiber membrane modules from them are disclosed.

Solvent-resistant microporous polybenzimidazole membranes and modules

Solvent-resistant microporous polybenzimidazole membranes

A method for making a chlorine-resistant composite polyamide membrane having high organic rejection, the essential step of which comprises treating a conventional composite membrane with an acyl halide. The novel membrane is especially suitable for the treatment of water containing chlorine or lower molecular weight organic compounds.

Chlorine-resistant composite membranes with high organic rejection

A composite lumen-side feed reverse osmosis membrane and its preparation are disclosed, the membrane comprising a polymeric microporous-walled hollow fiber support with an interfacially-polymerized ultrathin semipermeable salt-rejecting layer engrafted on the lumen or bore of the hollow fiber support, the support having walls that are substantially completely free of finger-like voids in excess of about 5 microns in the area of the wall adjacent the lumen. The preparation of the support comprises coaxially spin-casting (1) a fiber-forming solution containing a pore-forming material with (2) a lumen-forming fluid comprising from about 50 to about 70 vol % organic solvent in water.

Composite membrane for reverse osmosis

Growing community of inventors

Bend, OR, United States of America

Robert P Barss