Patent ID: 7138058
Filing Date: 2006-11-21
Classification: B01D,C08G,C08L,C22B,Y02A,Y02P

Abstract:
1. A nanofiltration membrane comprising a polysulfonamide polymer matrix which after exposure to a 20% sulfuric acid solution for either, 24 hours at 90° C. or 30 days at 40° C.; is capable of meeting the test of: removing at least 50% of the copper ions from a feed solution consisting of 9.5% CuSO 4 and 20% sulfuric acid at a flux of at least 1 gallon per foot 2 per day; wherein the feed solution is applied to the membrane at a pressure of 600 psig and a temperature of 25° C., wherein the nanofiltration membrane is prepared from the reaction of 1) a naphthalene disulfonyl reactant, a naphthalene trisulfonyl reactant, a benzene disulfonyl reactant, or a benzene trisulfonyl reactant, or mixtures thereof; with 2) diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexaethylenepentamine, or tris-(2-aminoethyl)amine, or mixtures thereof.