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| Number | Title | Issue Date |
| 4451440 | Utilization of ion exchange resin in the processing of kaolins A method of processing naturally occurring kaolin clay wherein ion exchange resins are utilized to remove charged soluble impurities from the clay thereby eliminating the filtration step required in conventional clay beneficiation process. Further, by sat... | 05/29/1984 |
| 4448693 | Method for partially desalinating water with a weakly acid and strongly basic ion exchanger materials and subsequently regenerating the ion exchanger materials A process for the partial desalination of water with a combination of weakly acid cation exchangers in free acid form and basic anion exchangers in hydrogen carbonate form, both present in aqueous suspensions, and subsequent regeneration of the charged io... | 05/15/1984 |
| 4434058 | Cooling arrangement and method of operating the arrangement A cooling arrangement particularly for cooling electrical devices having water cooled electric conductors with deionized cooling water in a closed cooling system which contains a parallel loop with a mixed bed filter in which an anion exchanger in OH form... | 02/28/1984 |
| 4432878 | Cooling arrangement and method of operating the same The invention relates to a cooling arrangement, particularly for cooling electrical devices with water-cooled electric conductors, with deionized cooling water (deionate) and a closed cooling system which contains a parallel loop with a mixed-bed filter. ... | 02/21/1984 |
| 4427549 | Deionization method and apparatus A deionization method and apparatus comprising separate cation and anion removing sections 10a, 10b, the cation section having separate tanks 14, 16 and the anion section having separate tanks 24, 26. Respective cation and anion control valve assemblies 1... | 01/24/1984 |
| 4374028 | Process for waste water purification Disclosed is an improved process for purifying waste water in which a waste water containing contaminants, including dispersed solids, water-immiscible organic materials, and metallic cations, is first introduced to a sedimentation zone to remove water-in... | 02/15/1983 |
| 4341636 | Treatment of wastewater Process for treating wastewater, which includes measuring the pH of the wastewater, adjusting the pH to about 10-11; filtering the wastewater; and subjecting the wastewater to ion-exchange treatment; and certain filter media.... | 07/27/1982 |
| 4336140 | Water purification process Water of low solids content is purified by ion exchange treatment in separate beds with anion and cation exchange resins, the rate of flow of water through the last bed at least being fast. The beds are usually shallow and the flow rate through the last b... | 06/22/1982 |
| 4321145 | Ion exchange treatment for removing toxic metals and cyanide values from waste waters Ion exchange techniques are utilized to treat waste water flows, especially those from plating baths, by passing the waste water through a multi-level ion exchange resin bed, the bed thereafter being regenerated by a series of steps, including backwashing... | 03/23/1982 |
| 4321144 | Process for producing fully desalted process water Process for producing fully desalted process water by the treatment of raw water with cation and anion exchangers in a separate multi-stage arrangement. The water which leaves the main cation exchanger stage or stages, has a residual sodium content of les... | 03/23/1982 |
| 4263147 | Treatment process A process for treatment of a liquid stream, optionally comprising solids such as minerals, comprises passing at least two different treating reagents through contactors each comprising a drum with a rotor having axially spaced discs compartmentalizing the... | 04/21/1981 |
| 4252644 | High performance ion exchange composition and the removal and separation of ions therewith An ion exchange composition comprising an insoluble substrate of a synthetic resin having ion exchanging sites at least on its available surface; and a finely divided, insoluble material comprising synthetic resin particles of from about 0.1 to about 5 mi... | 02/24/1981 |
| 4235717 | Process for desalting an aqueous caustic solution Ion retardation resins particularly useful for desalting caustic solutions are prepared by employing ion exchange resins consisting essentially of a mixture of a reticular, insoluble, cross-linked styrene/divinylbenzene copolymer with an entrapped non-lea... | 11/25/1980 |
| 4235715 | Process for removing alkalinity and hardness from waters Raw water is fed to a first column containing a weak acid cation exchange resin in hydrogen form where alkalinity causing ions and hardness causing ions to the extent of alkalinity are converted to carbonic acid. The carbonic acid, which hydrolyzes to dis... | 11/25/1980 |
| 4216906 | Method of making high velocity liquid jet Water at a very high pressure (e.g. fifty thousand psi) is directed through a nozzle orifice to produce a coherent high velocity water jet particularly adapted for cutting. Prior to pressurizing the water and directing it through the nozzle, the water is ... | 08/12/1980 |
| 4211649 | Method of and apparatus for treating water A housing or porous water-permeable material containing granular water-treatment particles is immersed in a quantity of water, and means are provided for effecting circulation of the water through the housing whereby certain chemicals are removed from the... | 07/08/1980 |
| 4207184 | Process for the purification of industrial effluents A process for purifying industrial effluents, wherein said effluents are brought into contact with a polymer adsorption material which is in the form of a solvated, preferably hydrated, gel.... | 06/10/1980 |
| 4206051 | Process for demineralizing saline solutions A process for demineralizing an aqueous saline solution containing a deoxygenating agent by treating it with a thermally regenerable ion-exchange resin comprising a resinous material derived from a substituted diallylamine.... | 06/03/1980 |
| 4188292 | Inexpensive purification of urea waste streams Urea is destroyed in aqueous waste streams containing various anions and cations plus urea by contacting the stream with a cation exchange resin, then reacting the resulting stream with nitric oxide, nitrous acid or a nitrite salt to convert the urea to n... | 02/12/1980 |
| 4186174 | Process and apparatus for obtaining a more concentrated solution of a component using ion exchange beds A process and apparatus for obtaining a more concentrated solution of components such as chromium containing anions by the use of ion exchange beds. A solution containing the component to be concentrated is passed through a first bed in which the componen... | 01/29/1980 |
| 4163716 | Process for the purification of contaminated water The invention concerns a process for the purification of acid dyehouse effluent from a dyeing process, which is contaminated with coloured substances and heavy metal ions. After removal of fibers, the effluent is subjected to ion exchange to remove surfac... | 08/07/1979 |
| 4163717 | Removal of silica from mixed bed demineralizer Silica can be removed effectively from a mixed bed demineralizer containing an anion exchange resin and a cation exchange resin during regeneration by (1) passing from about 30 to about 80 volume % of an anion regenerant solution through only the anion exchang... | 08/07/1979 |
| 4154801 | Process for purifying alkali metal hydroxide or carbonate solutions Highly purified alkali metal hydroxide and carbonate solutions are obtained by treating self-contaminated solutions thereof with composite ion exchange resin bodies having low residual amounts of quaternary ammonium cation not intimately associated with c... | 05/15/1979 |
| 4108893 | Purification of an aqueous solution of acrylamide An improved process is disclosed for the purification of an aqueous solution of acrylamide. It comprises bringing a crude aqueous solution of acrylamide into contact with oxygen or an oxygen-containing gas and thereafter subjecting the solution to a dual ... | 08/22/1978 |
| 4049772 | Process for the recovery of chromic acid solution from waste water containing chromate ions A chromic acid solution can advantageously be recovered from the waste water by a process which comprises passing the waste water successively through an anion-exchange column system consisting of two or more serially interconnected anion-exchange resin c... | 09/20/1977 |
| 4039442 | Ion-exchange process for desalting water and subsequent regeneration of the ion exchangers Water to be desalted in an ion-exchange process is contacted with a first cation exchanger in the form of a monovalent cation, and a first anion exchanger. The resultant treated solution is then reacted with a second, weakly acidic cation exchanger in the... | 08/02/1977 |
| 4036751 | Method of treating water containing chromate A method of treating water containing chromate by bringing the water-to-be-treated into contact with ion-exchange resins, which comprises: passing the water-to-be-treated through a bed of weakly acidic cation exchange resin in H-form at first; subsequentl... | 07/19/1977 |
| 4028234 | Buffering agents An improved process for water demineralization involving the use of a first separate column of weakly acidic cation exchange resin, a second separate column of weakly basic anion exchange resin and a third separate column of weakly acidic cation exchange ... | 06/07/1977 |
| 4006214 | Process for the recovery of fluorine from an aqueous solution A process for the treatment of aqueous solutions containing cations and anions, including aluminum sulphate and fluoride ions, for the recovery of the fluorine contained in the aqueous solution by means of an ion exchange plant, in which the aqueous solut... | 02/01/1977 |
| 4002455 | Process for treating and recovering waste water from the fertilizer manufacture Waste water from the manufacture of fertilizers with nitrogen and others is treated on ion-exchange resins. The resulting demineralized water is used as such. The ion-exchange resins are regenerated with highly concentrated nitric acid, in excess, with hi... | 01/11/1977 |
| 3989624 | Method and apparatus The invention provides a method and apparatus for rinsing an object which has been removed from a chromium plating bath, and which has a source of chromium-containing anions thereon, while preventing the delivery of these anions to the environment. In car... | 11/02/1976 |
| 3982956 | Process for the purification of impure sugar juice Impure sugar solution having a pH of 2 - 6.5 is decolorized by passing the same through a weakly basic anion exchanger having tertiary amine functionality and operated over a hydroxyl form.... | 09/28/1976 |
| 3975267 | Liquid treating system A method for producing treated liquids by utilizing a treating material such as an ion exchange resin or adsorbent resin, said liquid to be treated being passed through a zone containing said treating material; when said ion treating material is exhausted... | 08/17/1976 |
| 3961981 | Refining of sugar containing liquids by ion exchange A process for purifying sugar containing liquids or solutions, optionally at a sugar mill site, in which the hot sugar liquids are initially contacted with a weakly basic anion exchange resin in the bicabonate form, the salt impurities in the juices being... | 06/08/1976 |
| 3956115 | Process for the regeneration of ion-exchange resins and applications thereof Cationic and anionic ion exchange resins are regenerated with highly concentrated acids or bases, under conditions such that the resin temperature at the interface regenerant-liquid or wash water/resin-bead does not rise above about 20°C. The control of ... | 05/11/1976 |
| 3939071 | Recoverable regenerants for cationic exchange resins An improved, closed-cycle process for regeneration of weakly acidic spent cation resins and for the recovery and recycle of the regenerants is disclosed. The improvement resides in the use of hydroxy or alkoxy substituted carboxylic acids as the cation re... | 02/17/1976 |
