04983291 is referenced by 62 patents and cites 13 patents.

High flux semipermeable membranes which comprises the polymerized reaction product within and/or on a porous support backing material may be prepared by contacting the porous support such as a polysulfone with an aqueous solution of a polyamine which may, if so desired, contain a polar aprotic solvent not reactive with the amines, a polyhydric compound and an acid acceptor. The surface of the coated support is freed of excess solution and thereafter contacted with an organic solution of a polyacyl halide for a period of time sufficient to form a polymerized reaction product within and/or on the support material. The resulting composite is then treated with a hydroxy polycarboxylic acid, polyaminoalkylene polycarboxylic acid, suffonic acid, amine salts of acids, amino acid, amino acid salt, polymeric acid and inorganic acid, before drying of the membrane. This will enable the membrane to be stored in a dry manner prior to use thereof in a separation process. The resultant membrane composite may be used in separation processes such as desalination of brackish or sea water or the softening of domestic hard water.

Title
Dry high flux semipermeable membranes
Application Number
7/450637
Publication Number
4983291
Application Date
December 14, 1989
Publication Date
January 8, 1991
Inventor
Hong C Chu
San Diego
CA, US
William G Light
San Diego
CA, US
Michael M Chau
San Diego
CA, US
Agent
Gerard P Rooney
Harold N Wells
Raymond H Nelson
Assignee
Allied Signal
NJ, US
IPC
B01D 71/68
B01D 71/60
B01D 61/02
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