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WO/1999/056287A1 |
A method for treating a radioactive waste which comprises contacting a liquid waste containing a radioactive isotope with a selective adsorbent for the element of the isotope, which is soluble or easily decomposable, to thereby adsorb th...
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WO/1999/042434A2 |
The invention relates to a method for producing an aqueous hydroxylamine solution which is substantially free of metal ions. According to said method the hydroxylamine solution is subjected to at least one treatment with an acid cation e...
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WO/1999/037399A1 |
The invention concerns a method for preparing polyazacycloalkanes immobilised on a silica gel from a polyazacycloalkane of formula (A) in which: R¿1? and R¿2? represent a hydrogen atom, an alkyl radical, or a [hetero(aryl)]alkyl radica...
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WO/1999/036151A1 |
The present invention is directed to a process of removing trace acidic impurities from an impure solution of photoacid generating compounds in a solvent, comprising contacting an impure solution of at least one photoacid generating comp...
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WO/1999/022933A1 |
A process for removing ions of dissolved heavy metals and complex heavy metals comprises providing a treatment zone in which is contained an extraction material having an activated surface that has an affinity for heavy metal ions and co...
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WO/1999/021654A1 |
The invention concerns inorganic-organic hybrid gels for extracting species such as lanthanides and actinides, and their preparation. Said gels comprise a system of inorganic units of formula (I) in which M represents Si, Ti, Zr or Al, w...
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WO/1998/051619A1 |
A process for the separation of pentavalent arsenic from an aqueous solution using an N-alkyl pyridinium-containing adsorption medium is disclosed. An oxidizing medium and process for the oxidation of trivalent arsenic to pentavalent ars...
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WO/1998/048098A1 |
A new fibrous chelate-forming material prepared by introducing specified acyl groups of general formulae (1) and (2) into fiber molecules to impart the function of forming a chelate with a metal to the molecules; a new process for thus p...
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WO/1998/043738A1 |
Apparatus, materials, and methods for removing ammonia from fluids using metal hydroxides (e.g. zinc hydroxide) and metal loaded media (e.g. zinc loaded ion exchange resins); the metal hydroxides and metal loaded media may be regenerated...
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WO/1998/042910A1 |
A chelate-forming fiber which has in its molecule an amino group and a group having at least two hydroxyl groups bonded to carbon (preferably a group represented by formula (1)), possesses an excellent capability of scavenging metalloid ...
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WO/1998/040144A1 |
In accordance with the present invention, an improved bifunctional cation-exchange composition has been formed which comprises synthetic resin support particles and both crown ether and non-crown ether functional groups attached thereto....
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WO/1998/011145A1 |
The invention concerns insoluble polymers which can swell only slightly and contain units of formula (I) and/or (II), in which R?1� is H, C�1?-C�6? alkyl; R?2�, R?3� are H, C�1?-C�20? alkyl, aryl, aralkyl; and ME is H, alka...
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WO/1998/008595A2 |
Polymeric articles, including membranes, with surfaces having a desired chemical functionality are created by surface segregation of a branched component blended with a compatible, matrix base component, the branched component having the...
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WO/1998/006739A1 |
Purification of poly-amino acid-tagged recombinant proteins has been improved by the use of a carboxymethylated aspartate ligand complexed with a third-block transition metal having an oxidation state of 2?+� and a coordination number ...
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WO/1998/004598A1 |
Cation exchangers or chelating agents characterized by at least comprising structural units of general formula (I) and structural units derived from a cross-linking monomer having an unsaturated hydrocarbon group [wherein A is C�3?-Cï¿...
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WO/1997/049754A1 |
The invention relates to polyamide derivatives with polymerisable double bonds obtainable by reacting the amino groups of the polyamide with an amino-reactive compound containing a polymerisable double bond, or by reacting the carboxyl g...
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WO/1997/049492A1 |
A method and composition for the concentration and removal of desired metal ions from a source solution by contacting the solution with an N-cyclic aromatic hydrocarbon-containing ligand covalently bonded to a solid support through a hyd...
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WO/1997/040088A1 |
A process is disclosed for producing finely divided, water-insoluble aziridine polymers by polymerisation of aziridines, preferably ethylene imine, in the presence of cross-linking agents which contain at least two functional groups in a...
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WO/1997/037995A1 |
The present invention provides calixpyrrole, calixpyridinopyrrole, and calixpyridine macrocycles, having 4, 5, 6, 7, or 8 heterocyclic rings, as well as syntheses, derivatives, conjugates, multimers, and solid supports thereof. Such macr...
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WO/1997/010367A1 |
Recovery of gold from alkaline cyanide leach solutions using ion exchange adsorbents, comprising (a) contacting the cyanide leach solution containing the gold with an extraction reagent comprised of a solid adsorbent carrying an organic ...
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WO/1996/038220A1 |
A process of selectively separating a target metal contained in an aqueous solution by contacting the aqueous solution containing a target metal with an aqueous solution including a water-soluble polymer capable of binding with the targe...
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WO/1996/036435A1 |
A composition of matter is provided in which a phosphonic acid or phosphonic acid ester group is linked through a thioether residue to a silicon atom which is further covalently bonded to a solid inorganic support. The compositions can b...
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WO/1996/033815A1 |
The use of selected cation exchange resins to remove dissolved multivalent cations such as iron, zinc, and chromium from used autodeposition compositions permits reuse of the autodeposition compositions without the need for added surfact...
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WO/1996/026904A1 |
Contaminants in ground water, waste water and industrial effluents are removed using a contaminant removing media packed in a radial flow column (2). The radial flow column includes a fluid chamber (22) having cylindrical inner and outer...
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WO/1996/019812A1 |
A process for the decontamination of radioactive materials which process comprises the steps of: i) contacting the material to be decontaminated with a dilute carbonate containing solution in the presence of ion exchange particles which ...
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WO/1996/017095A1 |
A composition comprising a crosslinked, highly porous body derived from a water-soluble hydrogel polymer, said porous body being characterized in that it has an open-celled three-dimensional lattice structure, a density of less than abou...
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WO/1996/014125A1 |
A method for the removal, separation, and concentration of cesium cations from a source solution which may contain larger concentrations of other alkali metal ions comprises bringing the source solution into contact with a polymeric resi...
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WO/1996/011056A1 |
Polyazacyloalkanes having 3, 4 or 5 nitrogen atoms, tri, tetra or pentaazamacrocyclic transition metal complexes and methods for the manufacture of said polyazacycloalkanes. The object of the invention is to provide polyazacyloalkanes ca...
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WO/1996/009985A1 |
Composite materials useful for removing metal ions from solutions such as aqueous waste streams comprise an inorganic ceramic support such as silica gel that has active hydroxyl groups. The support is reacted with a silane linking compou...
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WO/1996/009884A1 |
A composite material useful for removing heavy metal ions from solutions such as aqueous waste streams comprises a ceramic inorganic support such as silica gel which is covalently bonded, through a silane coupling agent, to a hydroxyquin...
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WO/1996/009885A1 |
Novel ceramic compositions are used for removing metal ions by chelation from solutions such as aqueous waste streams. The compositions are formed by covalently bonding to terminal hydroxy groups of a ceramic inorganic carrier or support...
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WO/1995/035165A1 |
A solid phase ligand comprising branched polyalkyleneimine covalently bound to an inorganic support by a linking group.
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WO/1995/029008A1 |
A method for removing, separating and concentrating certain selected ions from a source solution that may contain larger concentrations of other ions comprises bringing the source solution in contact with a composition comprising an ion-...
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WO/1995/025573A1 |
A method is provided for treating drinking water for disinfecting and/or removing iodide. The method utilizes resin bound silver ions. For performing the disinfection or iodide removal with minimal release of silver ions into the water b...
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WO/1995/021011A1 |
Magnetic particles which comprise a core of a magnetic material surrounded by a mixture of a fibrous material and a solid binding agent. The particles may be embedded in a polymer resin which incorporates sites, which are selective for p...
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WO/1995/019321A1 |
A water or wastewater purification process is described for reducing selenium and arsenic concentrations in contaminated water or wastewater streams. Iron loaded cation exchange resins, when contacted with contaminated water or wastewate...
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WO/1995/009854A1 |
The present invention relates to bis-imidazolyl compounds of formula (I) and polymers having the above-identified bis-imidazolyl compounds as a polymerizable unit. The present invention further relates to a method for scavenging trace qu...
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WO/1994/026378A1 |
A method for the removal of antimony ions from solid phases which have an affinity for antimony ions comprises contacting the antimony containing solid phase with an aqueous eluent solution comprising a mixture of a concentrated solution...
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WO/1994/012439A1 |
Apparatus and methods for removing formate ions from electroless metal plating baths employing formaldehyde as a reducing agent and typically comprising polyvalent anions as metal chelant and/or counterion. The apparatus and methods empl...
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WO/1993/025306A1 |
A method for the removal and concentration of desired ions such as Pd(II), Ru(III), Pd(IV), Au(III), Au(I), Ag(I), and Hg(II) from a multiple ion source solution which may contain larger concentrations of other undesired ions including H...
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WO/1993/006923A1 |
A method for the removal and concentration of desired ions such as Sb3+, Zr4+, Zn2+, Pu4+, Hf4+, Cu2+, Ni2+, Fe3+, Cd2+, Ag+, and Hg2+ from a multiple ion source solution which may contain larger concentrations of other undesired ions in...
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WO/1992/021419A1 |
A method for the removal, separation, and concentration of Rh, Ir, and/or Ru from a source solution which may contain larger concentrations of other ions including H+ comprises bringing the source solution into contact with a compound co...
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WO/1992/017403A1 |
A method for the removal and concentration of desired ions from a source solution which may contain larger concentrations of other ions including H+ comprises bringing the source solution into contact with a compound comprising a polyalk...
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WO/1992/011088A1 |
An ion exchanger for chromatographic separation has the structure P - S - A, wherein P is an insoluble support, S is a spacer, and A is a functional ligand. According to the invention the functinal ligand A comprises two positively charg...
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WO/1992/009527A1 |
The present disclosure relates to improved methods for the preparation of aluminum phosphate molecular sieves and faujasite-type zeolites having stably encapsulated multidentate metal chelate complexes. This is achieved through direct in...
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WO/1992/000805A1 |
The invention discloses a porous, non-particulate matrix permeable to convection which is capable of interacting with components of liquid phases, e.g., in adsorptive separation of materials, heterogeneous catalysis and solid phase synth...
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WO/1991/019675A1 |
An absorbent material which is a cloth or fabric at least part of which is cellulosic is provided herein for removing heavy metal ions and negatively-charged materials from water. The material comprises such cloth or fabric which had bee...
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WO/1991/016972A1 |
The object of the invention is a process for producing complex-forming ion-exchange resins containing 8-hydroxyquinoline groups which can be made from carrier materials which contain amino groups reactive with aldehydes, aldehydes, 8-hyd...
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WO/1991/017274A1 |
Process for extracting Ge, Ga, In, As, Sb, Bi, Pt, Pd, Ni, and/or Co from an acid aqueous solution, wherein use is made of a resin with 8-hydroxyquinoline groups, resulting from the reaction of an aminated resin with an aldehyde and 8-hy...
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WO/1990/011825A1 |
An ion-exchange media comprising a modified polysaccharide material and a modified silica or a modified particulate polymeric material, said modified materials comprising a polysaccharide and particulate polymeric materials covalently bo...
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