Abstract:
A method for purifying waste water, and a dual chamber purification system, in which feed water may be passed first through a hybrid anion exchange unit, and subsequently through a weak acid cationic exchange unit. The hybrid anion exchanger may comprise a hybrid sorbent (HAIX-NanoZr) with dual functional sorption sites. The weak acid cationic exchanger may be a fiber having a shell-core physical configuration with relatively short intra-particle diffusion path length so that the ion exchange sites reside predominantly on the periphery. The system may be used to achieve partial desalination or TDS reduction and concurrent removal of target contaminants (e.g., phosphate, hardness). Further, the system may be regenerated using CO2 as the sole regenerant for both the hybrid anion exchanger and the weak acid cationic exchanger, thus producing spent regenerant with no externally added chemicals.
Abstract:
A method for producing a protein adsorbent comprising a substrate and a molecular chain fixed on the surface of the substrate is disclosed. The method comprises, in this order: a dry-heat treatment step of heating a pretreatment adsorbent comprising the substrate and the molecular chain fixed on the surface of the substrate, in which the molecular chain contains a weak electrolytic ion-exchange group; and a wet-heat treatment step of heating the pretreatment adsorbent in a moistened state with a liquid or steam to obtain the protein adsorbent.
Abstract:
A cartridge for treating drinking water with an ion-exchange material, wherein the ion-exchange material includes added silver, and wherein means for removing silver are arranged at the outlet of the cartridge.
Abstract:
A metal adsorbent which can adsorb a wide variety of metals, can conform to various uses, and adsorbs metals in large amounts. Metal adsorbents in various forms, which have the property of highly efficiently adsorbing metals, are produced by (a) a method in which a polyamine polymer is chemically bonded and immobilized to a porous support, (b) a method in which a polyamine polymer is blended into a solution of a raw material for fibers and the mixture is formed into fibers by wet-spinning or dry spinning, and (c) a method in which a polyamine polymer is blended into a solution of a film-forming polymer and the mixture is formed into a film by a method of film formation from solution.
Abstract:
A metal adsorbent which can adsorb a wide variety of metals, can conform to various uses, and adsorbs metals in large amounts. Metal adsorbents in various forms, which have the property of highly efficiently adsorbing metals, are produced by (a) a method in which a polyamine polymer is chemically bonded and immobilized to a porous support, (b) a method in which a polyamine polymer is blended into a solution of a raw material for fibers and the mixture is formed into fibers by wet-spinning or dry spinning, and (c) a method in which a polyamine polymer is blended into a solution of a film-forming polymer and the mixture is formed into a film by a method of film formation from solution.
Abstract:
The chemical filter supporting an ion-exchange resin comprising a fiber supporting body containing ion-exchange fiber and ion-exchange resin powder which is supported on the fiber supporting body is provided. The chemical filter possesses a large ion-exchange capacity per unit volume and exhibits high initial performance of eliminating ionized gaseous pollutants and excellent durability of the elimination performance.
Abstract:
A linear exchange element with functionalized polymer on a core of rope, twine or yarn has well defined physical structure and may function as a spacer or be formed into free-standing exchange elements. A screen is fabricated from such strands or strips, with a pattern of mixed, sequential or other exchange types for enhanced operation in a capture device or in an electrodialysis device. Strands possess tensile strength, enabling deionization devices of new architecture, such as fiber-wound cartridges and other packing arrangements. Bodies made of the strands may operate as walls to perform the function of an exchange membrane or bed, or may operate as spacers positioned between membranes to enhance ion capture and transport, and their properties simplify handling and regeneration. Electroseparation devices advantageously employ the open spacers to better treat food, fermentation product or other streams where high conductivity, suspended solids and fouling would otherwise present problems. “Woven” mats may be arranged so that strands of one type in a first layer possess at least some points of contact with strands of opposite type in an adjacent layer, and different strand diameter and mesh pitch or dimension may be employed for treating fluids of different viscosity or concentration to optimize treatment throughput and removal rate, or to minimize fouling or flow obstruction and otherwise extend the range of treatment parameters.
Abstract:
A hollow filament comprising a filamentary polymer composed predominantly of a flame-resistant and anti-fusing cured novolak resin, characterized in that the hollow structure continuously extends in the axial direction of the filament, the degree of hollowness thereof being in the range of 10 - 80%, and a process for producing the same which comprises treating a filament consisting of a fiber-forming polymer of predominantly an uncured novolak resin composition, with a curing reagent in the presence of a curing catalyst to effect the cure of said filament extending from the peripheral portion to the axial portion thereof to a depth of 20-90% of the cross-sectional area of the filament, and thereafter removing the uncured core portion of said filament by extraction with a solvent.
Abstract:
PYROLYTIC CARBON FIBER CONTAINING CATION-EXCHANGE ACID RESIDUES, SUCH AS SULPHONIC, CARBOXYLIC AND PHOSPHATE GROUPS, AND A METHOD FOR THE PRODUCTION FO PYROLYTIC CARBON FIBER WHICH COMPRISES SUBJECTING AN ORGANIC FIBROUS MATERIAL TO PYROLYSIS, FOLLOWED BY SULPHONATING, OXIDIZING OR PHOSPHORYLATING THE RESULTANT PYROLYTIC FIBER.
Abstract:
Synthetic ion-exchange material is made in the form of sheets, films, rods, cylinders or tubes, characterized by the presence of positive and negative groups on common macromolecules and a combined acidic and alkaline capacity of at least 0.3 meq. per gram. The macromolecular material which forms the basis of the ion-exchange material is preferably polyethylene, but may also be composed of polymers of propylene, styrene, vinyl chloride, chlorotrifluoroethylene or tetrafluoroethylene, or of natural or synthetic rubber. In the examples polyethylene film is exposed to accelerated electrons, and placed in styrene, which grafts on to the irradiated film. The grafted styrene is successively chlorosulphonated, reacted with ethylene diamine or 3-diethylaminopropylamine, and hydrolyzed with sodium hydroxide to produce aromatic nuclei some of which bear acid groups and others of which bear basic groups. Tertiary amino groups in the polymer may be quaternized with methyl iodide.