公开(公告)号：US3658955A

公开(公告)日：1972-04-25

申请号：US3658955D

申请日：1970-04-15

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： CHAMBERLIN RICHARD M ,  EMSWILLER JAMES L ,  CALDERWOOD ANDREW S ,  STANA REGIS R

IPC: B01D20060101 ,  B01D69/10 ,  B29C41/04 ,  B29C63/34 ,  B29D20060101 ,  B29D7/00 ,  B29D23/00 ,  C08L1/00 ,  B29C13/00 ,  B29D27/04

CPC classification number: B01D69/04 ,  B01D67/0013 ,  B01D69/10 ,  B01D71/16 ,  B01D71/22 ,  B01D2323/16 ,  B01D2323/42

Abstract: A UNITARY, TUBLAR REVERSE OSMOSIS MEMBRANE IS MADE BY PLACING A VISCOUS CASTING SOLUTION CONTAINING A CELLULOSIC FILM FORMING MATERIAL, A SOLVENT, AND A LEACHABLE SWELLING AGENT INTO A HOLLOW TUBE, PLACING A CASTING BOB HAVING A CIRCULAR CROSS SECTION AT ITS WIDEST POINT INTO ONE END OF THE TUBE, PUSHING THE CASTING BOB THROUGH THE CASTING SOLUTION WITH A GAS UNDER PRESSURE TO FORM A CONTINUOUS FILM OF CASTING SOLUTION ON THE INSIDE OF THE HOLLOW TUBE, EXPOSING THE FILM TO AIR, AND CONTACTING THE

FILM WITH A LEACHING LIQUID TO FORM A REVERSE OSMOSIS MEMBRANE.