Bifunctional phenyl monophosphonic/sulfonic acid ion exchange resin and process for using the same
A cross-linked water-insoluble ion exchange resin comprised of polymerized monomers having a phenyl ring is disclosed. A contemplated resin contains (i) polymerized phenyl ring-containing monomers having a phosphonic acid ligand linked to the phenyl ring, (ii) about 2 to about 5 millimoles per gram (mmol/g) of phosphorus as phosphonic acid ligands, and (iii) a sufficient amount of a sulfonic acid ligand such that the ratio of mmol/g of phosphonic acid to mmol/g sulfonic acid is up to 3:1. A process for removing polyvalent metal cations from aqueous solution, and a process for removing iron(III) cations from acidic copper(II) cation-containing solutions that utilize the contemplated resin or other resins are disclosed.
United States Patent 6232353 Pharmaceutical ion exchange resin composition
A process is provided for preparing a granular pharmnaceutical ion exchange resin composition that is readily dispersible in water by granulating an ion exchange resin, having a pharmacologically active ingredient bound thereto, with a particulate sugar or sugar alcohol. The process is characterised by the use of an aqueous solution of a sugar or sugar alcohol as a granulating medium.
Patent number: 6077532 Ion exchange resin plant
An ion exchange resin plant for the demineralizing or softening water with an arrangement that allows the plant to operate continuously. The plant tank is divided into to two separate compartments that work simultaneously. One compartment effects water demineralization while the other compartment regenerates the ion exchanging resins.
Patent number: 6972091 Ion exchange fluorocarbon resin membrane
An ion exchange fluorocarbon resin membrane having a storage modulus (JIS K-7244), when substituted with tributyl ammonium ions, at a temperature of not less than Tc represented by the following general equations (1-1) to (1-3) of 0.8×106 Pa or more, and a heat of crystal fusion at 270 to 350° C. of 1 J/g or less: description="In-line Formulae" end="lead"Tc (° C.)=55+Tg (EW 750) (1-1)description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Tc (° C.)=0.444×EW-278+Tg (750?EW 930) (1-2)description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Tc (° C.)=135+Tg (EW?930) (1-3)description="In-line Formulae" end="tail" where Tg designates the peak temperature of loss tangent in the dynamic viscoelasticity measure-ment of the ion exchange fluorocarbon resin membrane (having SO3H as the ends of the side chains).
Patent number: 7160926 Ion exchange resin
An ion exchange resin comprising an ion exchange material dispersed or distributed throughout a polyurethane matrix. The ion exchange material is typically a second polymer which has been chemically modified after dispersion or distribution throughout the polyurethane matrix.
Patent number: 6203708 Ion exchange fluorocarbon resin precursor composition
An ion exchange fluorocarbon resin precursor composition obtained by removing liquid components from a mixed solution of a dispersion of an ion exchange fluorocarbon resin precursor and a dispersion of tetrafluoroethylene polymer (PTFE).
Patent number: 6911482 Metal-doped sulfonated ion exchange resin catalysts
A method for preparing ketones in greater yield and selectivity compared to previous catalyzed reactions by acid-catalyzed condensation reaction using a metal-doped polysulfonated ion exchange resin catalyst is disclosed. For example, use of polysulfonated ion exchange resins having at least 5.0 milliequivalents sulfonic acid groups/gram catalyst and loaded with metal, such as palladium, provides enhanced yields of methyl isobutyl ketone from the condensation reaction of acetone compared to use of conventional monosulfonated ion exchange resin catalysts.
Patent number: 6977314 Treated ion exchange resin and method for treatment thereof
This invention relates to ion exchange resins that have a reduced amount of physically adsorbed organic compounds, as well as methods of producing and using such resins. In particular, the amount of extractable total organic carbon on the resins may be less than about 200 parts per trillion by wet weight, as measured using gas chromatography/mass spectrometry. This invention also relates to methods of treating water that use such resins.
Patent number: 6693139 Ion-exchange resin membrane and method for producing the same
A reactive liquid is coated on an ion exchange resin precursor membrane for the hydrolysis treatment. Preferably, a reactive liquid having a viscosity of not lower than 50 mPa·s or a small surface tension is used. Said precursor membrane is also subjected to the hydrolysis treatment under constraint, while the precursor membrane is maintained in a widened or a stretched state.
Patent number: 7037949 Modified ion exchange materials
Ion exchange materials, as particulate and membranes, are modified by permanently attaching counter ions to a portion of the ion exchange sites. The permanent attachment of the counter ions forms semiconductor junctions which act as mini anodes, or cathodes, to significantly increase the ability to oxidize or reduce a species to be treated, or split water, in an electrolytic reactor. The non-converted transfer sites in the ion exchange material also significantly increase the mobility of the ionic species in the electrolyte. The ion exchange material may be a monobed of either modified anion exchange material or modified cation exchange material, or a suitable mixed bed of both, depending upon the application. When the anode is in direct contact with a modified cation exchange material and under the influence of direct current, free radical hydroxyl and regenerant hydrogen are formed. When the cathode is in direct contact with a modified anion exchange material and under the influence of direct current, free radical hydrogen and regenerant hydroxyl are formed. Alternatively, the modified ion exchange material can be separated from both the anode and the cathode, and regenerant hydrogen and hydroxyl are produced at the semiconductor junctions.
United States Patent 6024850 Phosphonic acid based ion exchange resins
An ion exchange resin for extracting metal ions from a liquid waste stream. An ion exchange resin is prepared by copolymerizing a vinylidene disphosphonic acid with styrene, acrylonitrile and divinylbenzene.
Patent number: 5281631
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