Abstract: An improved separation system and its method of operation for the separation of solutes, colloidal particles, or suspended matter from solutions of suspensions containing the same is disclosed. In a preferred embodiment, this invention relates to a simple and economic membrane filtration system that can be operated in many of the modes of operation of a membrane filtration system, especially suction backwashing, without mixing the filtrate with the feed stream.

Abstract: Strong base ion exchange resins derived from crosslinked vinylbvenzyl chloride polymers are particularly suitable for purifying condensate waters for steam regenerating equipment. Preferred embodiments utilize gellular anion exchange resins to remove corrosion products from boiler condensate waters.

Abstract: A process for preparing anion exchange resin having macroreticular structure by suspension copolymerizing a polyvinylidene crosslinking monomer and a monoethylenically unsaturated aliphatic ester of acrylic acid in the presence of a liquid which is substantially immiscible with the aqueous phase of the suspension polymerization medium, which is a solvent for the monomers, and which does not substantially swell the resulting copolymer; the resulting macroreticular copolymer is isolated and aminolyzed to form an anion exchanger.

Abstract: Ionic solutes are removed from fluids under oxidizing conditions or conditions of high physical stress or shock by contacting the fluids with ion exchange resin beads having macroreticular structure. These beads have a particular resistance to such conditions, and are formed by functionalizing with ion exchange functional groups a copolymer of 4-25% polyvinylidene crosslinking monomer and 96-75% monoethylenically unsaturated monomer or monomers, suspension polymerized in a liquid which is a solute for the monomer mixture, which does not substantially swell the copolymer, and which is present with the polyvinylidene monomer in an amount sufficient to cause separation of the copolymer from the dissolved monomer.

Abstract: Improved system for delivering a controllable concentration of anesthetic gas to a patient by eluting with a carrier gas a solid polymeric adsorbent previously loaded with an anesthetic, the concentration being dependent only on the adsorbent temperature and the initial quantity of adsorbed anesthetic. Preferred embodiments utilize the polymeric adsorbent's capability of delivering a broad range of concentrations at low flow rates in a recycle delivery system.

Abstract: Hard, infusible, discrete beads of crosslinked copolymer are prepared by free-radical catalyzed polymerization of a monomer mixture in aqueous dispersion wherein a minor amount of a modifier, specifically an organic compound containing acetylenic or allylic unsaturation having the ability to moderate the rate of polymerization, is incorporated in the monomer mixture. Ion exchange resins having improved mechanical strength are obtained by attaching functional groups to the copolymer.

Abstract: A process for the manufacture of crosslinked ion exchange copolymer particles wherein small seed particles are swollen to final size by concurrently feeding monomer and polymerizing the same under controlled suspension conditions and the unique ion exchange particles produced thereby.

Abstract: Metal salt complexes of 3-isothiazolones and compositions containing them exhibit useful biocidal properties, including bactericidal, fungicidal, and algaecidal properties.

Abstract: A process for preparing reticular crosslinked copolymer beads by suspension copolymerization in an aqueous medium a polyvinylidene monomer and a monovinyl aromatic hydrocarbon monomer in a liquid precipitant which has a low solubility in the aqueous medium, is a solvent for the monomer mixture and does not appreciably swell the copolymer, the liquid precipitant and said polyvinylidene monomer each being present in an amount exceeding the critical concentration of each needed for phase separation of the copolymer from the monomer phase, and the products produced by said process.

Abstract: Method for adsorbing an organic material from a fluid or fluid mixture containing organic material with a macroreticulated crosslinked copolymer having a plurality of microscopic channels resulting from the liquid explusion of a precipitating agent during polymerization of a monomer mixture under suspension polymerization conditions, whereby the organic material is adsorbed by the macroreticulated crosslinked copolymer.

Abstract: Ion exchange resins having improved physical stability and perfect bead count are prepared by a free-radical catalyzed polymerization of a monomer mixture utilizing certain peroxyester and peroxydicarbonate catalysts, followed by functionalizing the so prepared polymer.

Abstract: Catalysts of various types, preferably enzymes, are immobilized on hollow fiber membranes in novel way to provide a new system for performing catalytic reactions. In preferred embodiments, novel processes for catalyzing reactions utilizing hollow fiber techniques are disclosed.

Abstract: Process for preparing cation exchange resin having macroreticular structure, high surface area and lowered apparent density from a macroreticulated copolymer produced by copolymerizing a mixture of a monoethylenically unsaturated monomer and a polyethylenically unsaturated monomer dissolved in an organic liquid which is a solvent for said monomers but unable to substantially swell the resulting copolymer, and macroreticulated cation exchange resin beads produced by the process.

Abstract: Novel membranes having two or more coatings of polyelectrolytes with at least one oppositely charged adjacent pair of coatings separated by a neutral layer to reduce charge neutralization, their method of preparation, and use for rejecting ionically charged solutes.

Abstract: 1. In a process for preparing a cation exchange resin having a water-insoluble matrix and cation exchange groups bonded thereto, the improvement comprising employing as said matrix a solid copolymer of macroreticular structure which is permeated by small channels or voids into which liquids are able to penetrate, which matrix is prepared by copolymerizing a mixture consisting essentially of (1) a monovinyl carbocyclic aromatic compound or an ester of acrylic or methacrylic acid, with (2) a polyethylenically unsaturated monomer selected from the group consisting of a polyvinyl carbocyclic aromatic compound, an ester of a dihydric alcohol and an .alpha.-.beta.

Abstract: Novel, macroreticular cross-linked anion exchange and adsorbent copolymers of at least one monovinylidene ring-containing nitrogen heterocyclic monomer are prepared. Preferred monovinylidene ring-containing heterocyclic monomers are the various vinylpyridines.

Abstract: Novel anion exchange resins containing a crosslinked aromatic backbone resin with sulfonamide functional ion exchange groups on the aromatic rings and a process for producing the same.

Abstract: Hard, infusible, discrete beads of crosslinked copolymer are prepared by free-radical catalyzed polymerization of a monomer mixture in aqueous dispersion wherein oxygen is incorporated in the monomer mixture. Ion exchange resins having improved mechanical strength are obtained by attaching functional groups to the copolymer.

Abstract: Ions are exchanged between emulsion ion exchange resins and conventional ion exchange resins during both batch and column contact. This process may be used to place the emulsion resin or the conventional resin in the desired ionic form.