Abstract: Process for conditioning contaminated ion-exchange resins, more particularly contaminated cationic resins, wherein the contaminated ion-exhange resin or resins are brought into contact with a basic compound in a sufficient quantity to block the active sites of the cationic resin or resins, the thus treated ion-exchange resin or resins are incorporated into an ambient temperature-thermosetting resin and the latter is crosslinked.

Abstract: An ion-exchange membrane is formed from a solution containing dissolved matrix polymer and a set of monomers which are capable of reacting to form a polyquaternary ion-exchange material; for example vinyl pyridine and a dihalo hydrocarbon. After casting the solution and evaporation of the volatile components, a relatively strong ion-exchange membrane is obtained which is capable of removing anions, such as nitrate or chromate from water. The ion-exchange polymer forms an interpenetrating network with the chains of the matrix polymer.

Abstract: A method of manufacturing amphoteric resins. Polymeric beads are treated sequentially with two reagents of opposite acid/base character. The resins are useful in the desalination of water.

Abstract: Polymeric electrolyte complexes are prepared by reacting at least one polymer represented by one of the following formulas: ##STR1## wherein R.sub.1 and R.sub.2 represent hydrogen or alkyl of 1 to 4 carbon atoms; R.sub.3 is --CH.sub.2 --C(R).dbd.CH.sub.2, --(CH.sub.2).sub.m COOC(R).dbd.CH.sub.2,--CH.sub.2).sub.m COOCH.sub.2 --C(R).dbd.CH.sub.2, or --CH.sub.2).sub.m O-C(R).dbd.CH.sub.2,--CH.sub.2).sub.m O-CH.sub.2 -C(R).dbd.CH.sub.2 or ##STR2## wherein R is hydrogen or methyl, m is a number from 1 to 3 and n is 0 or 1; at least one of R.sub.4, R.sub.5 and R.sub.6 is --CH.sub.2 --C(R).dbd.CH.sub.2, --CH.sub.2).sub.m COOC(R).dbd.CH.sub.2, --CH.sub.2).sub.m COOCH.sub.2 OC(R).dbd.CH.sub.2,--CH.sub.2).sub.m O--C(R).dbd.CH.sub.2,--CH.sub.2).sub.m O--CH.sub.2 --C(R).dbd.CH.sub.2, --CH.sub.2).sub.m CONH-C(R).dbd.CH.sub.2 or ##STR3## wherein R is hydrogen or methyl, m is a number from 1 to 3 and n is 0 or 1; the remaining R.sub.4, R.sub.5 and R.sub.

Abstract: Anion exchange resins containing borohydride counter ions display essentially the same chemical activity as solutions of sodium borohydride but have the added advantage that products treated therewith are not contaminated with sodium ions or borate ions. Thus, alcohols can now be freed of carbonyl components without thereby being contaminated with borate; metal ions, such as silver, can be reduced to the free element; metal ions of groups IV-A to VI-A can be converted to volatile metal hydrides; and transition metal ions can be converted to the boride. The anion exchange resin is prepared by treating a strong base anion exchanger with aqueous sodium borohydride or sodium cyanoborohydride. Regeneration of the borohydride form from the borate proceeds directly with aqueous sodium borohydride.

Abstract: A composition and method for the oxidation of organic contaminants in waste water by subjection to heterogeneous photosensitized oxidation is disclosed.

Abstract: An ion exchange composition comprising an insoluble substrate of a synthetic resin having ion exchanging sites at least on its available surface; and a finely divided, insoluble material comprising synthetic resin particles of from about 0.1 to about 5 microns median diameter (with respect to volume) having, at least on their outer surfaces, ion exchanging sites which attract the ion exchanging sites of the substrate, irreversibly attached as a monolayer to the available surface of the substrate. The composition is used for removal and separation of ions, and is especially useful in liquid ion exchange chromatography.

Abstract: The invention relates to a method for preparation of hydrophilic anion exchangers from gels based on crosslinked copolymers of hydroxyalkyl acrylates and methacrylates, oligo- and polyglycol monoacrylates and monomethacrylates, hydroxyalkylacrylamides or hydroxyalkylmethacrylamides with crosslinking comonomers containing 2 or more acrylcyl or methacryloyl groups in the molecule, as alkylene, oligo- and polyglycol diacrylates and dimethacrylates or divinylbenzene, which gels may have the homogeneous, heterogeneous or macroporous character.

Abstract: New chelate exchange resins capable of selective recovery of copper, nickel, and other valuable metals from an acidic aqueous leach liquor are prepared by reacting a crosslinked haloalkyl polymer matrix resin (I) with certain aminopyridines (II) to give a resin (III) ##STR1## with pendent methyleneaminopyridine groups attached to the matrix resin. Particularly useful resins are obtained by reacting chloromethylated styrene-divinylbenzene copolymer beads with an aminomethylpyridine, such as 2-picolylamine, N-methyl-2-picolylamine, N-(2-hydroxyethyl)-2-picolylamine, N-(2-methylaminoethyl)-2-picolylamine, or bis-(2-picolyl)amine. At a typical copper ore leach liquor pH of about 2, the picolylamine resins will absorb 15-30 mg copper/ml resin with a 5-10 fold selectivity for copper over ferric iron.