公开(公告)号：US3745202A

公开(公告)日：1973-07-10

申请号：US3745202D

申请日：1971-03-17

Applicant: US INTERIOR

Inventor： RIGGLEMAN B ,  COHEN M ,  GRABLE M

IPC: C08J9/28 ,  C25B13/04 ,  B29D27/00 ,  C08B29/10 ,  C08B29/32

CPC classification number: B01D67/003 ,  B01D67/0027 ,  B01D69/08 ,  C08J9/28 ,  C08J2201/0543 ,  C08J2201/0546 ,  C08J2301/08 ,  Y10S264/14

Abstract: ASYMMETRIC MEMBRANES ARE PREPARED FROM NON-SELECTIVE THERMALLY GELLED SUBSTRATES OF A CELLULOSE DERIVATIVE. AFTER LEACHING, THE SUBSTRATE IS ANNEALED AND THEN TREATED IN A DILUTE AQUEOUS SOLUTION OF EITHER P-DIOXANE, FORMIC ACIDS OR NITROMETHANE AT AN ELEVATED TEMPERATURE. THE RESULTING SEMIPERMEABLE MEMBRANE IS PARTICULARLY SUITED FOR DESALINATION BY REVERSE OSMOSIS.