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| Number | Title | Issue Date |
| 7459139 | Process for preparation of non-hazardous brominating agent A cost-effective process is described for the preparation of a stable and non-hazardous brominating reagent containing 2:1 stoichiometric ratio of alkali bromide to alkali bromate. The process comprises of reacting alkaline bromine intermediate mixture, obtained fro... | 12/02/2008 |
| 7314606 | Recovery of sodium thiocyanate from industrial process solution using nanofiltration technique The present invention relates to a membrane-based nanofiltration process for separating sodium thiocyanate (NaSCN) from industrial solution containing impurities such as β-sulfopropionic acid, β-sulfopropionitrile, sodium sulfate and salts of iron and calcium in a... | 01/01/2008 |
| 7179400 | Stabilization composition for halogen-containing polymers The invention is a stabilizer composition for halogen-containing polymers, comprising a carrier material of the general formula CaxAl2(OH)2(x+2)HPO3.m H2O, wherein x is a number from 2 to 12 and m is a number fr... | 02/20/2007 |
| 7037482 | Solvent extraction of a halide from a aqueous sulphate solution A method of extracting a halide and sulphate from an aqueous sulphate solution, such as a zinc sulphate solution, comprises subjecting the solution to solvent extraction to extract halide and sulphate from the solution and controlling the amount of sulphate extracte... | 05/02/2006 |
| 6890453 | Finely distributed stabilizing composition for polymers containing halogen The present invention is a stabiliser composition for halogen-containing polymers, comprising a salt of a halogen-containing oxy acid and an inorganic or organic acid or an inorganic base. The present invention relates also to a process for the preparation of such s... | 05/10/2005 |
| 6824756 | Process for manufacturing and using a more stable formulation of sodium chlorite Method for producing stable sodium chlorite by pelletization of granular sodium chlorite with metal salt or salts forming hydrates with water of hydration in the pellets being more than 5% of the anhydrous weight of the sodium chlorite. Pelletized sodium chlorite ca... | 11/30/2004 |
| 6616907 | Chemical preparation of chlorate salts A novel method of producing metal chlorates is described which involves the reaction of ammonium chlorate with metal carbonates and/or metal bicarbonates. The reaction yields extremely pure metal chlorate, as well as ammonia and carbon dioxide by-products... | 09/09/2003 |
| 6471871 | Method for the removal of silicon and heavy metals from aqueous streams A batch or continuous process for the removal by flocculation of silicon and heavy metal contamination from aqueous waste streams by the addition of an aluminum salt, particularly, aqueous streams recycled as electrolyte in the electrolytic production of ... | 10/29/2002 |
| 5948380 | Preparation of non-alkali chlorates A method for synthesizing non-alkali chlorates is described. The method includes the steps of: 1) reacting a non-alkali metal salt with sodium bicarbonate to form an insoluble metal carbonate or metal hydroxide precipitate; and 2) combining the precipitat... | 09/07/1999 |
| 5681446 | Impurity removal for sodium chlorate Control of sulfate and perchlorate impurity levels is provided in a procedure for manufacturing crystalline sodium chlorate by electrolyzing an aqueous solution of sodium chloride and crystallizing sodium chlorate from the resulting aqueous solution of so... | 10/28/1997 |
| 5439555 | Minimum adverse environmental pulp with feed to chlorate manufacture Liquid effluent from a pulp mill bleach plant having at least one chlorine chemical bleach stage is evaporated and then used in chlorate manufacture. The bleach plant effluent produced by evaporation may be stored and then transported to an off-site chlor... | 08/08/1995 |
| 5437852 | Water-soluble pre-ceramic polymers and methods of their production A method of making water soluble pre-ceramic polymers includes heating hydrated metal salts above their melting points. A flow of air drives off water and most of the ligands. Polymerization occurs in the melt and the remaining side groups make the polyme... | 08/01/1995 |
| 5378447 | Method for the preparation of chlorates from waste gas streams obtained from the production of chlorine dioxide A process is disclosed for producing a dilute solution of an alkali or alkaline earth metal chlorate from a chlorine and carbon dioxide waste gaseous stream. The process of the invention can be combined in a continuous process for the production of an alk... | 01/03/1995 |
| 5356610 | Method for removing impurities from an alkali metal chlorate process The invention relates to a method for removing calcium ions and silicon compounds from various liquors produced or obtained in an alkali metal chlorate process, thereby reducing the operating cost and improving the possibility to close the process further... | 10/18/1994 |
| 5300191 | Chlorine dioxide generation for a zero discharge pulp mill Chloride dioxide for a cellulose pulp mill bleach plant is produced by concentrating (evaporating) liquid effluents from the bleach plant to a concentration level high enough for incineration, incinerating the concentrated effluents to produce an ash, che... | 04/05/1994 |
| 5292406 | Process for electrolytic production of alkali metal chlorate and auxiliary chemicals The present invention relates to a process to limit the content of impurities in the production of alkali metal chlorate, by integrating the production of chlorate with the production of chlorine and alkali metal hydroxide, which auxiliary chemicals are u... | 03/08/1994 |
| 5264089 | Production of chlorine dioxide employing chloric acid - alkali metal chlorate mixtures A continuous process for producing chlorine dioxide which comprises feeding an aqueous solution of an alkali metal chlorate to a first ion exchange compartment of an electrolytic cell having an anode compartment, a cathode compartment and at least one ion... | 11/23/1993 |
| 5258105 | Chloric acid - alkali metal chlorate mixtures and chlorine dioxide generation An aqueous solution of chloric acid and alkali metal chlorate is produced in an electrolytic cell having an anode compartment, a cathode compartment, and at least one ion exchange compartment between the anode compartment and the cathode compartment. The ... | 11/02/1993 |
| 5223103 | Electrochemical process for producing chloric acid-alkali metal chlorate mixtures A process for producing chlorine dioxide from an aqueous solution of chloric acid and alkali metal chlorate which is prouced in a electrolytic cell having an anode compartment, a cathode compartment and at least one ion exchange compartment between the an... | 06/29/1993 |
| 5154805 | Method of preparing chlorate The invention discloses a method in the electrolytic production of alkali metal chlorate which is recovered by crystallization and separation of the crystals from a solution recycled to the electrolysis process. A given proportion of the crystals formed a... | 10/13/1992 |
| 5124009 | Consumption of hypochlorite values contained in chlorate solutions of electrolysis The objectionable hypochlorite values, ClO- ions, contained in a solution of an alkali metal chlorate produced by the electrolysis of an aqueous solution of the corresponding chloride of the alkali metal, are effectively destroyed (consumed) w... | 06/23/1992 |
| 5108722 | Sulfate removal from chlorate liquor Disclosed is a method of removing sulfate ion from an aqueous sodium chlorate liquor. A crystallization temperature is selected between about -15° and about 0° C. and the maximum concentration of sodium chlorate that is soluble in the liquor at that tem... | 04/28/1992 |
| 5087334 | Continuous process for the manufacture of potassium chlorate by coupling with a sodium chlorate production plant The present invention relates to a continuous process for the manufacture of potassium chlorate by coupling with a plant for the production of sodium chlorate by electrolysis, the said plant comprising a source of NaCl solution, (1), a loop for purificati... | 02/11/1992 |
| 5084148 | Electrochemical process for producing chloric acid - alkali metal chlorate mixtures A process for electrolytically producing an aqueous solution of chloric acid and alkali metal chlorate in an electrolytic cell having an anode compartment, a cathode compartment, and at least one ion exchange compartment between the anode compartment and ... | 01/28/1992 |
| 5063041 | Process for the reduction of perchlorate in electrolytes used for the production of chlorate The invention relates to a process for the reduction of the perchlorate content in electrolytes for chlorate production, whereby the electrolyte is subjected to the following process steps: a) a part of the flow of an electrolyte leaving the chlorate process i... | 11/05/1991 |
| 4849201 | Process for preparing chlorinated lime A process for preparing chlorinated lime solid having an available chlorine ontent in the range of about 30 to about 50 weight percent by contacting a chlorine source, e.g., liquid chlorine, with a basic calcium-containing substance, e.g., hydrated lime, i... | 07/18/1989 |
| 4795535 | Process for the production of alkali metal chlorate At the production of alkali metal chlorate by electrolysis of alkali metal chloride in an electrolyser a part of the liquid phase from the electrolyser is brought to a crystallizer for precipitation of alkali metal chlorate crystals. The hydrogen gas form... | 01/03/1989 |
| 4636376 | Sulfate removal from alkali metal chlorate solutions A process for the removal of essentially chromium-free sulfate from a chromate and sulfate-containing chlorate liquor which includes mixing the chlorate liquor having a pH of between about 2.0 and 6.0 with a calcium-containing material at a temperature an... | 01/13/1987 |
| 4620969 | Electrolysis of alkali metal chloride solution with subsequent production of alkali metal carbonates and hypochlorites A process for the production of chlorine by the electrolysis of aqueous sodium chloride solution in which a gaseous stream containing chlorine and carbon dioxide is passed into a first reaction vessel and thence into a second reaction vessel and aqueous s... | 11/04/1986 |
| 4543243 | Process and a device for the production of chlorine dioxide The present invention provides a process for the continuous production of chlorine dioxide by the reaction of hydrochloric acid with an alkali metal chlorate solution, which is obtained by means of an electrolysis plant from a chlorate solution containing... | 09/24/1985 |
| 4532111 | Recovery of catalysts as W, Mo or Ru oxychlorides in liquid phase chlorination of pyiridine compounds Metal chloride catalysts employed in liquid phase chlorination reactions are recovered by treating the reaction mass with oxygen or air to form solid metal oxychloride compounds which can be separated and reused.... | 07/30/1985 |
| 4508697 | Hypochlorite destruction using urea A process for destroying waste alkali metal hypochlorite such as sodium hypochlorite is disclosed. The process involves reacting 50-90% and preferably 70-90% of the alkali metal hypochlorite with urea at from 20°-60° C. and pH 6-8 with pH 7-8 being pref... | 04/02/1985 |
| 4402924 | Preparation of high surface area metal fluorides and metal oxyfluorides, especially aluminum fluoride extrudates A method is described for the preparation of high surface area metal fluorides and metal oxyfluorides comprising reacting high surface area metal oxides with a fluorocarbon vapor wherein the fluorocarbon is selected from the group consisting of CH4-Q... | 09/06/1983 |
| 4376099 | Process for recovering Cr(VI) ions from a chlorate cell liquor From a chlorate cell liquor containing an alkali metal chlorate, an alkali metal chloride and Cr(VI) ions, Cr(VI) ions are recovered by means of a combination of simple chemical procedures and re-used in an electrolysis step for manufacturing an alkali me... | 03/08/1983 |
| 4348371 | Process for the recovery of calcium salts from calcium hypochlorite process effluents A process for the recovery of calcium chloride hydrates and calcium chlorate compounds comprises: (a) blending an effluent comprised of an aqueous solution of calcium chloride, calcium chlorate, and calcium hypochlorite and having a weight ratio of Ca(ClO... | 09/07/1982 |
| 4344847 | Process for obtaining energy, soft water and by-products from aqueous substances The aqueous substance, for example sea water, is boiled, the steam produced is fed under pressure into a turbo-alternator turbine producing electricity, the residual steam is reduced into soft water and the residue of evaporation, for example sea salt, is... | 08/17/1982 |
| 4259297 | Chromate removal from concentrated chlorate solution by chemical precipitation A method has been devised for removing hexavalent chromium from concentrated aqueous alkali metal chlorate solution by reacting the solution with an inorganic sulfur containing compound and separating divalent and trivalent chromium compounds from the sol... | 03/31/1981 |
| 4216195 | Production of chlorine dioxide having low chlorine content The proportion of chlorine dioxide to chlorine in aqueous solutions formed from gaseous mixtures of chlorine dioxide and chlorine is improved over conventional separation techniques. The gaseous product stream from a chlorine dioxide generator is scrubbed... | 08/05/1980 |
| 4175038 | Purification of waste streams containing available chlorine A process is disclosed for reducing the available chlorine content of aqueous waste streams produced in chemical plants, especially calcium hypochlorite plants, in order to permit further purification treatment in waste purification systems which employ a... | 11/20/1979 |
| 4171350 | Method for reacting hydrogen and oxygen in the presence of a liquid phase The rates of reaction between two gases is controlled by bringing the gases (hydrogen and oxygen) into an aqueous medium and into contact with a Contacogen which is wetproofed with respect to the medium. Even if the reaction between the gases in gas phase... | 10/16/1979 |
