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| Number | Title | Issue Date |
| 4195138 | Chelate resins prepared from the cured reaction product of a polyalkylenepolyamine and epoxide Chelate resins are obtained by introducing an effective amount of chelate active groups into the cured reaction product of an epoxide and a polyalkylenepolyamine. For example, an alkali metal salt of a halogenated carboxylic acid such as sodium chloroacet... | 03/25/1980 |
| 4177142 | Mixture of oppositely charged filter aid material Impurities are removed from a liquid by passing the liquid through an improved filter bed. The filter bed comprises a mixture of oppositely charged particles of filter aid material, the particles normally having a surface charge in aqueous solution. A por... | 12/04/1979 |
| 4147623 | Hydroxylamine purification via ion exclusion A process for separating hydroxylamine from an aqueous solution thereof also containing salts of cations whose corresponding free bases have base dissociation constants greater than 10-7. Said solution is brought to a pH of 6-11 and is passed t... | 04/03/1979 |
| 4142020 | Hetero-macrocyclic compound coated on the surface of solid Hetero-macrocyclic compound coated on the surface of a solid comprising a reaction mixture of (a) hetero-macrocylic compound having at least one amino group in the molecule and (b) a compound selected from the group consisting of an epoxy compound and a i... | 02/27/1979 |
| 4126574 | Surfactant-containing aluminosilicates and process This invention relates to cation-exchanging, water-insoluble aluminosilicates containing bound water and an ionic surface-active compound resistant to water hardness formers and having, for every mol of Al2 O3, from 0.7 to 1.5 mols C... | 11/21/1978 |
| 4110154 | Method for making a soluble sulfite additive for use in a pulp making process Sodium bisulfite, for use in the acid digestion of wood to produce pulp is obtained for the process by passing calcium bisulfite through a strong cation exchange resin in the sodium form and regenerating the exchanger with sodium chloride. The calcium bis... | 08/29/1978 |
| 4087357 | Desalination process using thermally regenerable resins A process for desalinating water containing mineral salts utilizes thermally regenerable hybrid resins. A preferred embodiment provides for the desalination of saline water using hybrid resins comprising per hundred parts of macroreticular host polymer, a... | 05/02/1978 |
| 4083782 | Water conditioning process Water is conditioned by contacting it with a weak acid cation exchange resin based upon a crosslinked methacrylic acid copolymer structure in the alkali metal (or ammonium) form. The resin when exhausted may be regenerated by either a two-step acid/alkali... | 04/11/1978 |
| 4071508 | Anionic hydrogels based on hydroxyalkyl acrylates and methacrylates Novel anionic hydrogels, containing acidic groups in their molecular structure, and processes for their preparation are described. These novel hydrogels are stable three-dimensional polymer networks, having good water permeability and mechanical propertie... | 01/31/1978 |
| 4070234 | Process related to pulp bleaching effluent purification using ion exchange resins A process for purifying the effluent from a pulp bleaching process which includes a chlorine treatment, an alkali extraction, and a final bleaching is disclosed, wherein a number of washing steps are connected in counter-current series from a final wash s... | 01/24/1978 |
| 4046687 | Process for the adsorptive removal of arsenic, antimony and/or bismuth from an aqueous solution A process for the adsorptive removal of one or more impurity elements, selected from the group which consists of: arsenic, antimony and bismuth, from an aqueous solution containing same in which the solution is contacted with a water-insoluble or low-solu... | 09/06/1977 |
| 4025608 | Ion exchange material Zirconium phosphate is made by reacting a zirconium salt with phosphoric acid or a phosphate in a liquid medium, the zirconium salt being insoluble in water. A granular product may be obtained having a grain size controlled by that of the salt. The produc... | 05/24/1977 |
| 4013553 | Fluid treatment method This invention relates to methods of removing materials from fluids, and in one embodiment includes an ionically biasable foraminous belt which moves through a multiplicity of transversals to the flow path of said fluid which are sequentially positionally... | 03/22/1977 |
| 3961029 | Process for recovering chromic acid solution from a waste liquor containing chromic ions From a chromate ion-containing aqueous waste liquor the chromate ion can be advantageously recovered in the form of chromic acid by the process comprising the steps of adding a reducing agent to the chromate ion-containing aqueous waste liquor to precipit... | 06/01/1976 |
| 3948769 | Ligand exchange process for removal of ammonia The selective removal of ammonia from waste water is achieved by the use of a ligand exchanger which has been conditioned with a salt of a metal which is capable of forming a complex with ammonia. The ligand exchanger is regenerated by contacting it with ... | 04/06/1976 |
| 3931003 | Ion exchanger for the treatment of waste water An ion-exchanger material consisting of a cellulose ion-exchanger impregnated with .gamma.-manganese dioxide. A method for the treatment of waste water to remove dissolved high molecular organic compounds, ammonium and phosphate ions therefrom, comprising... | 01/06/1976 |
