Abstract:
The present invention relates to a method for the production of improved shell functionalized ion exchange resins from core/shell copolymer having a highly crosslinked core.
Abstract:
Disclosed is a process that uses reverse osmosis (RO) or nanofiltration (NF) membranes and ion exchange (IX) water softening resins to maximize the production of drinking water, purified industrial service water or recycled purified municipal or industrial effluents. The membrane and ion exchange units are configured in a manner that enables operation of the system at high permeate recoveries in the range 90% to 99%, thus producing purified drinking water with a minimum volume of wastewater to drains and a very low membrane cleaning or membrane replacement frequency. The process mitigates membrane fouling and scale formation and minimizes the use of water treatment chemicals including acidic and alkali solutions and sodium chloride salt that is normally required to regenerate the IX resin.
Abstract:
A process for hydro-extracting non-ferrous metals from a slurry, pulp or solution, the process including a resin which is a copolymer of a polystyrene and a non-styrenic polymer, wherein the non-styrenic polymer includes the following subunit: Formula (I) wherein Rb is a divalent linking group, preferably alkylene, and most preferably (—CH2—CH2—; and Rd is NH, NR, O or absent. Preferably the resin has an acrylic backbone.
Abstract:
In a solution of metal-polymer (chelate(s) and applications thereof, a metal-polymer chelate is prepared by mixing water and R—COOH soluble carbohydride molecules and/or hydroxyl or hydroxyl amino and/or carboxyl and/or carbohydrate polymers, metal salts and/or ammonia or amines. The solution of metal-polymer chelate(s) is used extensively in different technical areas including oxidation, condensation, degradation, oxidizing condensation, gas detection, artificial imitated chitosan solution, artificial imitated glucosamine, disinfectant, biochemical reaction for fermentation, biological protein and its metabolite purification, metal enzyme biocatalyst, dry activation of protein enzyme, bacteria preservation systems, oil product, plant, semiconductor, nano filtration, nano material production, nano inorganic matter, nano ceramic, nano plastic, nano textile, battery, liquid crystal, and biochip. These reactions give effects for chemical engineering, gas removal, and waste solvent treatment.
Abstract:
The present invention relates to a method of producing novel monodisperse chelate resins based on crosslinked polymer beads containing aminomethyl groups and/or aminomethyl nitrogen heterocyclic groups that have a high uptake capacity for heavy metals and rapid kinetics.
Abstract:
The present invention relates to a method for generating at least one polydentate metal chelating affinity ligand, which method comprises the steps of (a) providing at least one scaffold defined by the general formula (I): H2N—(X1)n—S—S—(X2)m—CH2—NH2 wherein X1 and X2 irrespective of each other are carbon atoms or heteroatoms, and n and m irrespective of each other are integers of 1 to 5; (b) providing at least one polydentate metal chelating affinity ligand arm, optionally in a form wherein the metal chelating functionalities of at least one arm are protected, on each scaffold by derivatisation of the nucleophilic NH2 groups of the scaffold; (c) reducing the disulfide bond of the derivatised scaffold; and, if required (d) deprotecting the functionalities of the ligand arm(s) provided in step (b). In the most preferred embodiment, the reduction of the disulfide bond and the deprotection step is performed essentially simultaneously.
Abstract:
Polyazacrown polymers based on the azacrown monomer 1,4,7,10,13,16,21,24-octaazabicyclo[8.8.8]hexacosane (“H6Aza222”) are disclosed. Azacrown monomer units are preferably linked with a suitable linking agent, and the resulting polymers are can absorb mercury from a water stream and form a stable complex therewith. Methods of making and using the polyazacrown polymers are also disclosed. The polymers have a high absorption capacity for and selectivity towards mercury, which properties are useful for the remediation of mercury-contaminated water. The polymers can be regenerated by the efficient removal of the absorbed mercury. Further, the absorbed mercury that is liberated from the polyazacrown polymers can be effectively concentrated and captured to prevent its re-release into the environment.
Abstract:
The present application relates to novel gel-type or macroporous picolylamine resins which are based on at least one monovinylaromatic compound and at least one polyvinylaromatic compound and/or a (meth)acrylic compound and contain tertiary nitrogen atoms in structures of the general formula (I) as functional group, where R1 is an optionally substituted radical from the group consisting of picolyl, methylquinoline and methylpiperidine, R2 is —CH2—S—CH2COOR3 or —CH2—S—C1-C4-alkyl or —CH2—S—CH2CH(NH2)COOR3 or —CH2—S—CH2—CH(OH)—CH2(OH) or or derivatives thereof or —C═S(NH2), R3 is a radical from the group consisting of H, Na and K, m is an integer from 1 to 4, n and p are each, independently of one another, a number in the range from 0.1 to 1.9 and the sum of n and p is 2 and M is the polymer matrix, a process for preparing them and their uses, in particular the use in hydrometallurgy and electroplating.
Abstract:
The present invention relates to macroporous, monodisperse boron-selective ion exchangers having improved boron uptake kinetics and improved boron capacity, containing N-methylglucamine structures, having a median diameter D between 550 and 750 μm and a volumetric fraction of beads between 0.9 D and 1.1 D of at least 75%.
Abstract:
A polymer carrier to which a prescribed zinc complex group is binding directly or through a spacer, having property to bond, under a certain condition, to an anionic substituent (a phosphate group, for example), showing low solubility to a solvent (preferably insolubility to a solvent) as a whole, and being capable of capturing, separating and purifying easily a substance having an anionic substituent (a phosphate group, for example).