Method for manufacturing of multilayer reverse osmosis membrane of polyamide-urea
AssigneeE. I. Du Pont de Nemours and Company
InventorSamuel D. Arthur
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Abstract
The present invention is directed to methods for using an improved reverse osmosis membrane that shows surprisingly improved solute rejection and permeation properties. The membrane includes a separating layer of a polyamideurea formed in situ by reaction of isocyanate-substituted acyl chloride and a diamine-treated microporous substrate.
Claims8
A process for desalination of saline water by reverse osmosis comprising contacting the saline water under pressure with a reverse osmosis membrane, said reverse osmosis membrane comprising a polyamideurea separating layer in contact with a substrate and showing improved salt rejection, flux and productivity, wherein said polyamideurea comprises the formula:
- ##STR2## where m, n>0,
- m+n.gtoreq.3
- X=a (m+n) valent organic group, and
- Y=a divalent organic group.
A process for removal of solutes from liquids selected from the groups of milk and fruit juice, beer and wine, by reverse osmosis comprising contacting the liquid under pressure with a reverse osmosis membrane, said reverse osmosis membrane comprising a polyamideurea separating layer in contact with a substrate and showing improved solute rejection, flux and productivity, wherein said polyamideurea comprises the formula:
- ##STR3## here m, n>0,
- m+n.gtoreq.3
- X=a (m+n) valent organic group, and
- Y=a divalent organic group.
Dependencies are inferred from the claim text.