Chlorine Dioxide Patents (Class 423/477)
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Patent number: 7935271Abstract: Certain exemplary embodiments can provide a composition of matter comprising a solid form of chlorine dioxide complexed with a cyclodextrin. When stored, a concentration of the chlorine dioxide in the composition of matter can be retained, with respect to an initial concentration of chlorine dioxide in said composition of matter, at, for example, greater than 12% for at least 14 days. Certain exemplary embodiments can provide a method comprising releasing chlorine dioxide from a solid composition comprising chlorine dioxide complexed with a cyclodextrin.Type: GrantFiled: July 31, 2008Date of Patent: May 3, 2011Inventors: Ken Harrison, Nick Blandford
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Publication number: 20110052725Abstract: A therapeutic agent for infectious skin and mucosal diseases to be applied to an infected area for ameliorating a symptom of the infected area caused by infection with a pathogenic microorganism includes: a chlorine dioxide solution including a dissolved chlorine dioxide gas.Type: ApplicationFiled: March 24, 2008Publication date: March 3, 2011Inventor: Takashi Shibata
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Publication number: 20110052480Abstract: Chlorine dioxide generation systems and methods are disclosed. In some embodiments, an optical analyzer may be positioned along a reactant feed line to measure a reactant concentration. A controller may adjust a flow rate of the reactant in response to information provided by the optical analyzer.Type: ApplicationFiled: May 28, 2010Publication date: March 3, 2011Inventors: Edward Max Martens, Glenn Wesley Holden
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Patent number: 7875460Abstract: A method for determining the available treatment dosage of stabilized chlorine dioxide in the prevention and the treatment of plaque accumulation, volatile sulfur compound production, gingivitis and periodontitis, and for differentiating the treatment dosage from other chlorine-containing compounds that may not have such beneficial effects is disclosed. When in solution as stabilized chlorine dioxide, the presence of other ions such as chlorate and chloride may not only obscure results as to the concentration of stabilized ClO2, but also reduce the predicted effectiveness. The present invention uses validated analytical methods to predict the effectiveness of stabilized ClO2 by more precisely measuring its concentration in solution. Such measurement renders precision at a level required of food-grade and pharmacy-grade chemotherapeutic agents in the oral cavity. Preferred concentrations are within the range of about 0.005 to about 2% (w/v) stabilized chlorine dioxide.Type: GrantFiled: July 9, 2007Date of Patent: January 25, 2011Assignee: Micropure, Inc.Inventors: James L. Ratcliff, Elizabeth A. Renken, Jessica K. Ward
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Publication number: 20100322820Abstract: A storage and mixing device is illustrated and described. The device can include first and second separate containers each defining a distinct internal cavity. The first container can be movable (e.g., rotatable) relative to the second container between a first position and a second position. In the first position, the cavities can be substantially sealed from one another. In the second position, a first gas forming ingredient in one of the cavities can mix with a second gas forming ingredient in the other cavity to form a gas, such as chlorine dioxide gas. The device can have one or more filtered openings to allow gas generated by mixing the first and second gas forming ingredients to escape into the ambient environment.Type: ApplicationFiled: August 26, 2010Publication date: December 23, 2010Inventor: Jonathan E. Levine
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Patent number: 7824556Abstract: Chlorous acid is generated from a chlorite salt precursor, a chlorate salt precursor, or a combination of both by ion exchange. The ion exchange material facilitates the generation of chlorous acid by simultaneously removing unwanted cations from solution and adding hydrogen ion to solution. Chlorine dioxide is generated in a controlled manner from chlorous acid by catalysis. Chlorine dioxide can be generated either subsequent to the generation of chlorous acid or simultaneously with the generation of chlorous acid. For catalysis of chlorous acid to chlorine dioxide, the chlorous acid may be generated by ion exchange or in a conventional manner. Ion exchange materials are also used to purify the chlorous acid and chlorine dioxide solutions, without causing degradation of said solutions, to exchange undesirable ions in the chlorous acid and chlorine dioxide solutions with desirable ions, such as stabilizing ions, and to adjust the pH of chlorous acid and chlorine dioxide solutions.Type: GrantFiled: October 18, 2005Date of Patent: November 2, 2010Inventors: Allison H. Sampson, Richard L. Sampson
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Publication number: 20100272860Abstract: A solid composition in the form of a tablet that generates and releases a biocidal solution comprising at least chlorine dioxide with an enhanced weight percent yield is presented. The composition comprises reactants capable of in-situ generation of chlorine dioxide comprising a chlorite donor that is coated with a gel-forming material that slows the rate of dissolution of the high solubility chlorite donor, a free halogen donor, and an acid source, resulting in an unexpectedly high weight percent yield and providing a controlled release of biocidal solution. The compositions of the invention show improved environmental stability which can reduce the cost of packaging and significantly increase the utility of the composition. The controlled release allows the use in multi-tablet chemical dispensers which may otherwise induce potentially explosive conditions or allow rapid release of the biocidal solution thereby inducing a spike in chemical concentration rather than a controlled and sustained release.Type: ApplicationFiled: June 2, 2010Publication date: October 28, 2010Inventor: Roy W. Martin
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Publication number: 20100263816Abstract: Steam stripper off gas from chemical pulp mills, for example kraft or sulphite pulp mills is rich in methanol and totally reduced sulphur (TRS) compounds. This gaseous stream is usually burned to avoid further handling of this TRS-rich, odorous stream. We found that once this gaseous stream is condensed, it can be used as a reducing agent in the chlorine dioxide generator, in place of purchased methanol. Surprisingly, we found that, in addition to the methanol component, the TRS components act as reducing agents during the production of chlorine dioxide or, at the very least, do not consume chlorine dioxide. The use of this stream in the ClO2 generator will allow pulp mills to reduce or eliminate the consumption of purchased methanol while providing a new approach to deal with TRS compounds in the chlorine dioxide generator rather than employing a dedicated TRS incinerator or any other combustion device.Type: ApplicationFiled: November 12, 2008Publication date: October 21, 2010Inventors: Naceur Jemaa, Michael Paleogou, George Sacciadis, Richard M. Berry
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Publication number: 20100233068Abstract: Chlorine dioxide (ClO2) is produced by apparatus and methods wherein a ClO2 gas produced in the apparatus is quickly introduced into a fluid stream to be treated with said gas. To this end, the apparatus has an interior chemical reaction chamber which houses an internal fluid flow tube having a fluid impervious upper section and a porous lower section that respectively define two zones within the interior chemical reaction chamber.Type: ApplicationFiled: March 8, 2010Publication date: September 16, 2010Applicant: MAVERICK SOLUTIONS, LLCInventors: Kristian E. Grimland, John Charles Sokol
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Publication number: 20100209332Abstract: A method for generating chlorine dioxide is disclosed in which chlorine dioxide generation is activated with a dry polar material. A system for generating chlorine dioxide is also disclosed, as well as compositions useful in the system and method.Type: ApplicationFiled: February 9, 2010Publication date: August 19, 2010Applicant: BASF Catalysts LLCInventors: Linda Hratko, Barry Keven Speronello
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Publication number: 20100196252Abstract: This invention comprises a lightweight, portable chemical combination of reagents for sterilizing or disinfecting objects in the absence of electrical power or fire. The chemical combination includes a chemical oxidant with the capacity to liberate a biocidal intermediate, a chemical reductant of the oxidant with the capacity to react with the oxidant, and an effector to induce a reaction between the oxidant and reductant. In one embodiment, the oxidant comprises chlorite, the reductant comprises sulfite, and the effector comprises ascorbate. In another embodiment, the chemical combination comprises the oxidant, reductant, effector and iron-activated magnesium. When water or water solutions are added to either embodiment, the chemical combination generates heat, steam and a biocidal intermediate that can destroy contaminating microorganisms. In one embodiment, the biocidal intermediate is a halogen-based biocidal intermediate, such as chlorine dioxide.Type: ApplicationFiled: May 26, 2009Publication date: August 5, 2010Inventors: Christopher Doona, Maria Curtin, Irwin A. Taub, Kenneth Kustin
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Publication number: 20100189631Abstract: Method to prepare fluids (liquids and gases) containing pure chlorine dioxide which is not contaminated by the starting materials or the byproducts of the chlorine dioxide synthesis or to deliver pure chlorine dioxide into any medium capable of dissolving chlorine dioxide, wherein the chlorine dioxide generated in the process is transported across a pore free polymeric membrane via selective permeation into the target medium.Type: ApplicationFiled: September 21, 2007Publication date: July 29, 2010Inventors: Zoltán Noszticzius, Sándor Balogh, Mária Gyökérné Wittmann, Kristóf Kály-Kullai, Marianna Megyesi, András Volford, Emese Merkertné Balogh, Levente Balogh
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Publication number: 20100189632Abstract: The invention concerns a process for the production of chlorine dioxide comprising generating chlorine dioxide in an aqueous reaction medium in a reaction vessel maintained at super-atmospheric pressure, withdrawing gaseous chlorine dioxide from said reaction medium, bringing withdrawn gaseous chlorine dioxide to an aqueous absorption medium and withdrawing gaseous chlorine dioxide from said absorption medium.Type: ApplicationFiled: July 11, 2008Publication date: July 29, 2010Applicant: AKZO NOBEL N.V.Inventors: John C. Sokol, Michael Burke
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Publication number: 20100189630Abstract: An efficient cyclic process and related compositions for the in-situ generation of chlorine dioxide from dilute solutions of chlorite anions at near neutral pH. The cyclic process provides a means of safe and effective use of chlorine dioxide with reduced concern of chlorite accumulation in the aqueous system. The disclosed chemistry used to support the cyclic process can be applied independently or in various combinations that are effectively inert. This dramatically reduces safety concerns since the chlorine dioxide is produced in-situ to the application and in dilute concentrations. Also, the process allows for regeneration of inert anions such as bromide and chlorite thereby reducing operating cost.Type: ApplicationFiled: January 23, 2009Publication date: July 29, 2010Inventor: Roy William Martin
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Publication number: 20100135894Abstract: Disclosed is a method for producing chlorine dioxide using hypochlorite, chlorite and an acidic substance, wherein sodium hypochlorite and sodium chlorite are mixed together in advance, and then hydrochloric acid is added into the mixture liquid.Type: ApplicationFiled: June 20, 2008Publication date: June 3, 2010Applicant: TAIKO PHARMACEUTICAL CO., LTD.Inventors: Shigeo Asada, Takashi Shibata, Koji Abe
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Patent number: 7682592Abstract: The invention relates to a continuous process for producing chlorine dioxide comprising the steps of continuously: a) feeding to a reactor (1) an acid, hydrogen peroxide and alkali metal chlorate; b) reacting the alkali metal chlorate with the acid and the hydrogen peroxide to form a product stream (2) containing chlorine dioxide, oxygen and alkali metal salt of the acid, c) bringing the product stream from the reactor to an eductor (3) and mixing it with motive water fed to the eductor and thereby forming a diluted product stream; d) removing oxygen from the diluted product stream; e) withdrawing part of the diluted product stream (9), before, during or after the step of removing oxygen; f) adding water (11) to the non-withdrawn part of the diluted product stream to form a recycle stream (12); and, g) bringing the recycle stream (12) to the eductor and feeding it thereto as motive water (4).Type: GrantFiled: November 18, 2005Date of Patent: March 23, 2010Assignee: AKZO Nobel N.V.Inventors: Gary Charles, Daniel D. Olson, Patrick S. Bryant
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Patent number: 7678388Abstract: An aqueous chlorine dioxide solution which comprises dissolved chlorine dioxide in a concentration of about 10 to 3000 mg/l, pH in the range of about 1 to 6, and a chlorine scavenging means such as sodium chlorite in a ratio in the range of about 1:4 to 1:15 (w/w) sodium chlorite to chlorine dioxide. The chlorine dioxide solution may be stored for use over a period of several days to several months.Type: GrantFiled: May 16, 2005Date of Patent: March 16, 2010Inventor: John Y. Mason
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Publication number: 20100062074Abstract: An allergen inactivating agent for preventing allergic manifestations or alleviating symptoms by reducing antigenicity of an allergen through contact with the allergen includes dissolved chlorine dioxide as an active ingredient.Type: ApplicationFiled: February 15, 2008Publication date: March 11, 2010Applicant: TAIKO PHARMACEUTICAL CO., LTD.Inventors: Hirofumi Morino, Takashi Shibata
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Publication number: 20100055027Abstract: The invention concerns a process for the production of chlorine dioxide comprising formation of chlorine dioxide in a reaction medium in at least one reaction vessel and withdrawing chlorine dioxide from said at least one reaction vessel, the process further comprising a step of treating reaction medium or at least one process stream originating directly or indirectly from said at least one reaction vessel with an adsorbent efficient for removing chlorinated organic compounds from said at least one process stream.Type: ApplicationFiled: January 3, 2008Publication date: March 4, 2010Applicant: Akzo Nobel N.V.Inventors: Kalle Hans Thomas Pelin, Fredrik Persson, Erika Stoltz
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Patent number: 7666384Abstract: Provided is a stable solid composition that produces chlorine dioxide upon contact with water.Type: GrantFiled: January 17, 2008Date of Patent: February 23, 2010Inventor: William D. Sanderson
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Publication number: 20090263313Abstract: A chloride dioxide generation system made efficient by the use of a minimum number of seals and the use of a sophisticated computerized control system with the chlorine dioxide generation system comprising a) multiple PID loop control, b) a touch screen interface (HMI), c) automatic flow control of chemical precursors, d) a process controller, e) a minimum number of seals, f) a seal-less vacuum eductor, g) a unit design of the ejector; seal-less tubing connector and seal-less manual flowmeters, h) a vacuum eductor to be used with gas supply and other chemical feeds, i) a mass dispersion chlorine flowmeter to accurately supply amount of chlorine gas, j) an optical chlorine dioxide analyzer looped to the process controller and k) an automatic efficiency control screen.Type: ApplicationFiled: February 23, 2009Publication date: October 22, 2009Inventors: Edward M. Martens, Earl B. Smith, Gregory J. Beckstrom
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Publication number: 20090185970Abstract: Provided is a stable solid composition that produces chlorine dioxide upon contact with water.Type: ApplicationFiled: January 17, 2008Publication date: July 23, 2009Inventor: William D. Sanderson
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Publication number: 20090136597Abstract: An efficient cyclic process and related compositions for the in-situ generation of chlorine dioxide from dilute solutions of chlorite anions at near neutral pH. The cyclic process provides a means of safe and effective use of chlorine dioxide with reduced concern of chlorite accumulation in the aqueous system. The disclosed chemistry used to support the cyclic process can be applied independently or in various combinations that are effectively inert. This dramatically reduces safety concerns since the chlorine dioxide is produced in-situ to the application and in dilute concentrations. Also, the process allows for regeneration of inert anions such as bromide and chlorite thereby reducing operating cost.Type: ApplicationFiled: January 9, 2009Publication date: May 28, 2009Inventor: Roy William Martin
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Patent number: 7504074Abstract: A chloride dioxide generation system made efficient by the use of a minimum number of seals and the use of a sophisticated computerized control system with the chlorine dioxide generation system comprising a) multiple PID loop control, b) a touch screen interface (HMI), c) automatic flow control of chemical precursors, d) a process controller, e) a minimum number of seals, f) a seal-less vacuum eductor, g) a unit design of the ejector; seal-less tubing connector and seal-less manual flowmeters, h) a vacuum eductor to be used with gas supply and other chemical feeds, i) a mass dispersion chlorine flowmeter to accurately supply amount of chlorine gas, j) an optical chlorine dioxide analyzer looped to the process controller and k) an automatic efficiency control screen.Type: GrantFiled: June 9, 2003Date of Patent: March 17, 2009Assignee: Siemens Water Technologies Corp.Inventors: Edward M. Martens, Earl B. Smith, Gregory J. Beckstrom
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Publication number: 20090054375Abstract: Certain exemplary embodiments can provide a composition of matter comprising a solid form of chlorine dioxide complexed with a cyclodextrin. When stored, a concentration of the chlorine dioxide in the composition of matter can be retained, with respect to an initial concentration of chlorine dioxide in said composition of matter, at, for example, greater than 12% for at least 14 days. Certain exemplary embodiments can provide a method comprising releasing chlorine dioxide from a solid composition comprising chlorine dioxide complexed with a cyclodextrin.Type: ApplicationFiled: July 31, 2008Publication date: February 26, 2009Inventors: Ken Harrison, Nick Blandford
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Patent number: 7488457Abstract: Processes for generating chlorine dioxide generally include acidifying an alkali metal chlorite solution; and contacting the acidified alkali metal chlorite solution with a solid phase chlorine containing material to produce chlorine dioxide. An exemplary system for generating chlorine dioxide generally includes a water source in fluid communication with a conduit that is fluidly connected to a vessel, wherein the vessel comprises a housing, an inlet in fluid communication with the housing and the conduit, an outlet, and a solid phase chlorine containing material disposed within the housing; an acid source downstream from the water source in fluid communication with the conduit; and a chlorite ion source in fluid communication with the conduit downstream from the acid source. Various means are provided for the acid source.Type: GrantFiled: October 10, 2003Date of Patent: February 10, 2009Assignee: Halox Technologies, Inc.Inventor: Felice DiMascio
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Publication number: 20090008238Abstract: A transportable gas sterilization unit having a chamber, a disposable gas generator utilizing chlorine dioxide as a sterilant, chemical quencher and a detector and a method of using the unit and to generate chlorine dioxide for medical instrument sterilization or disinfection. A two photon, photo-activated chlorine dioxide system and coatings utilizing chlorine dioxide as at least one sterilant material, and methods for coating medical instruments with the photo activated chlorine dioxide system.Type: ApplicationFiled: April 11, 2005Publication date: January 8, 2009Applicant: THE ARIZONA BD OF REG ON BEHALF OF THE UNIV OF AZInventor: Stuart K. Williams
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Publication number: 20080292534Abstract: An on-demand portable chlorine dioxide generator has a reagent bound medium in a first enclosed volume; a complementary reagent solution in a second enclosed volume, and a structure for selecting between a first position where the complementary reagent solution is forced through the reagent bound medium and a second position where said complementary reagent solution remains isolated from the reagent bound ion exchange medium, where a ClO2 solution is generated only during periods when the structure for forcing is actuated. The ClO2 solution can be discharged for use as a portable sprayer that can be used to treat surfaces infected by anthrax or other biological contaminants. When the bound reagent is chlorite, the complementary reagent is an acid or an oxidant. When the bound reagent is an acid or an oxidant, the complementary reagent solution is a chlorite solution.Type: ApplicationFiled: November 29, 2006Publication date: November 27, 2008Applicant: University of Florida Research Foundation,Inc.Inventors: David E. Richardson, Daniel Denevan, Dwight C. Ramdon
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Patent number: 7452511Abstract: A novel chlorine dioxide production apparatus, or reactor, is disclosed. The reactor receives reactants from two or more feed pipes under pressure, and the reactants react in a reaction chamber that operates under elevated pressure and within a specified temperature range. A gaseous product, such as chlorine dioxide, is generated and is released directly into a liquid stream for bleaching, disinfection, and other purposes. Also disclosed is a novel system for production of quantities of chlorine compounds from commercial grades of starting materials, and methods of using the reactor in situ for bleaching, and for disinfection, decontamination, and sterilization of flows of water or other liquids. An automated system for multiple points of addition of chlorine dioxide to a flow to be treated is also disclosed.Type: GrantFiled: May 5, 2003Date of Patent: November 18, 2008Inventors: Wilfried J. Schmitz, David Francis
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Patent number: 7407642Abstract: A method generating chlorine dioxide is provided. The method uses sodium chlorite solution and diluted sulfuric acid to generate chlorine dioxide with a significantly higher rate of conversion of chlorite to chorine dioxide than has been previously reported with sulfuric acid/chlorite chlorine dioxide generation.Type: GrantFiled: March 10, 2006Date of Patent: August 5, 2008Assignee: Bio-Chem ResourcesInventors: Frederick P. Mussari, David Francis, Wilfried Schmitz
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Patent number: 7407641Abstract: A chlorine dioxide generator comprises a water eductor surrounded by a variable volume plenum. The plenum casing is threaded onto the venturi body, permitting the plenum volume and area to be modified depending on the capacity required. Chlorine and sodium chlorite may be fed tangentially into a conical plenum and reacted therein to form chlorine dioxide, which is discharged into water passing through the eductor at the venturi throat.Type: GrantFiled: October 28, 2004Date of Patent: August 5, 2008Assignee: Superior Plus Inc.Inventors: Gerald Cowley, David Andrew Dean
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Publication number: 20080152580Abstract: A method for producing chlorine dioxide at rates of from a few pounds per day to several hundred pounds per day. A very simple, fixed capacity, educator-based (3) chlorine dioxide generator with booster pump (2) which provides a constant and precise motive water flow through the educator (3). The mixing of precursors is accomplished by educator vacuum pulling the precursors together through separate, but identical fixed diameter flow restrictors (9-10). Precursors flow together in a specified manner and into a reaction column (5) occupied by a static mixer (11) to provide more intimate mixing. Production of small quantities is accomplished by operating the generator in a pulsed mode, via a timer (1).Type: ApplicationFiled: November 21, 2005Publication date: June 26, 2008Inventor: Gregory D. Simpson
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Patent number: 7303737Abstract: A method for point-of-use generation of chlorine dioxide wherein the chlorine dioxide is generated quickly and at acceptable concentrations to avoid the need for subsequent dilutions and keeping the product non corrosive to the surface to be treated. A persulfate solution and a chlorite solution are mixed at a molar ratio of persulfate to chlorite of greater than 2. The chlorite solution is buffered to a pH of from 9 to 12. The persulfate solution is buffered to a pH of from 3 to 9.Type: GrantFiled: November 21, 2005Date of Patent: December 4, 2007Assignee: GOJO Industries, Inc.Inventors: Wilfred J. Hemker, Melissa A. Thompson
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Publication number: 20070253891Abstract: The halogen dioxide, chlorine dioxide is produced from its chlorite reactant using ion exchange media in a stable reactant form, and then passing a known concentration of counter ions through the ion exchange media in a moist environment so that there is an exchange of ions, and the reactants that are released form activated chlorine dioxide within the ion exchange material. The ion exchange media both contributes reactants to and extracts contaminants from the moist environment via its ion exchange mechanism. The counter ions may be derived from one or more stable precursor solutions which themselves may contain reactants and/or soluble catalysts. The reactants of the precursor solutions cannot act as the counter ion, or ions, in the ion exchange mechanism, but the soluble catalysts can. The ion exchange media can be mixed or layered with one or more insoluble catalysts, to enhance the formation of the activated halogen dioxide, chlorine dioxide within the ion exchange material.Type: ApplicationFiled: April 27, 2007Publication date: November 1, 2007Inventors: Richard L. Sampson, Allison H. Sampson
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Patent number: 7261821Abstract: This invention relates to an automated process for efficiently treating an aqueous system with chlorine dioxide. The process results in high efficiency yields of chlorine dioxide on a continuous basis by minimizing the waste of precursor chemicals. Additionally, the process creates less environmental stress because the formation of unwanted by-products is minimized. The level of chlorine dioxide in the aqueous system treated and other parameters of the process are monitored and adjusted automatically to maintain them within acceptable levels.Type: GrantFiled: November 8, 2005Date of Patent: August 28, 2007Assignee: Ashland Licensing and Intellectual Property LLCInventor: Edward S. Beardwood
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Patent number: 7252096Abstract: On-Line and Off-Line methods of simultaneously cleaning and disinfecting an industrial water system are described and claimed. The methods involve the addition to the water of the industrial water system of a Compound selected from the group consisting of the alkali salts of chlorite and chlorate and mixtures thereof; and an acid, followed by allowing the water in the industrial water system to circulate for several hours. The reaction of the alkali salts of chlorite and chlorate and acid produces chlorine dioxide in-situ in the water of the industrial water system. The chlorine dioxide kills microorganisms and the acid acts to remove deposits upon the water-contact surfaces of the equipment. An alternative method involves the use of a chelating agent and a biocide. Other possible cleaning and disinfection reagents may be added as needed including corrosion inhibitors, chelating agents, biocides, surfactants and reducing agents.Type: GrantFiled: November 30, 2004Date of Patent: August 7, 2007Assignee: Nalco CompanyInventors: Jasbir S. Gill, Amit Gupta
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Patent number: 7252772Abstract: The invention relates to a method for producing an essentially chlorite-free, stable, aqueous chlorine-oxygen solution. Said method comprises the following steps: (1) a hydrogen sulfate compound is dissolved in water, (2) an acid is added to the aqueous solution containing hydrogen sulfate in such a quantity that the pH value in the target final product in the form of the essentially chlorite-free, stable, aqueous chlorine-oxygen solution is maintained between approximately 3 and 5; (3) a peroxide compound is added; and (4) an aqueous chlorite solution is added dropwise in a quantity of between approximately 60 and 90 mole %, especially between 70 and 80 mole %, of chlorite, in relation to the concentration of peroxide compound. The invention also relates to the chlorine-oxygen solutions which can be obtained by means of said method.Type: GrantFiled: June 5, 2002Date of Patent: August 7, 2007Assignee: P&W Invest Vermogensverwaltungsgesellschaft mbHInventor: Walter Polak
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Patent number: 7241435Abstract: A system and process for oxidizing inorganic or organic species is disclosed. The system and process includes mixing a dilute aqueous alkali metal halite solution with a mixture of protic acids to produce an effluent containing a halous acid; and contacting the effluent containing the halous acid with a catalytic material to produce a halogen oxide.Type: GrantFiled: January 25, 2005Date of Patent: July 10, 2007Assignee: Halox Technologies, Inc.Inventor: Felice DiMascio
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Patent number: 7220367Abstract: Method, composition and system for generating chlorine dioxide gas in a controlled release manner by combining at least one metal chlorite and a dry solid hydrophilic material that reacts with the metal chlorite in the presence of water vapor, but does not react with the metal chlorite in the substantial absence of liquid water or water vapor to produce chlorine dioxide gas in a sustained amount of from about 0.001 to 1,000 ppm.Type: GrantFiled: June 12, 2001Date of Patent: May 22, 2007Assignee: BASF Catalysts LLCInventors: Barry K. Speronello, Appadurai Thangaraj, Xiaolin Yang
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Patent number: 7182883Abstract: A massive body, e.g., a tablet, for producing a solution of chlorine dioxide when the massive body is added to liquid water. The massive body comprises a metal chlorite such as sodium chlorite, an acid source such as sodium bisulfate and a source of free halogen such as the sodium salt of dichloroisocyanuric acid or a hydrate thereof. The concentration of free halogen in the solution will be: (a) less than the concentration of chlorine dioxide in said solution on a weight basis and the ratio of the concentration of chlorine dioxide to the sum of the concentrations of chlorine dioxide and chlorite anion in said solution is at least 0.25:1 by weight; or (b) equal to or greater than the concentration of chlorine dioxide in said solution on a weight basis and the ratio of the concentration of chlorine dioxide to the sum of the concentrations of chlorine dioxide and chlorite anion in said solution is at least 0.50:1 by weight.Type: GrantFiled: December 23, 2003Date of Patent: February 27, 2007Assignee: Engelhard CorporationInventors: Barry K. Speronello, Gerald S. Koermer, Appadurai Thangaraj, Ahmad Moini
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Patent number: 7160484Abstract: The present invention is generally directed to a method of producing an aqueous solution of chlorine dioxide from the reaction of a metal chlorite and an acid forming component which do not react to produce chlorine dioxide in the substantial absence of water. The reactants are separated from liquid water by a membrane which allows the controlled passage of liquid water and/or water vapor into contact with the reactants. The chlorine dioxide thus generated passes out through the membrane into the liquid water to produce the desired aqueous solution. Aqueous solutions containing chlorine dioxide produced in this manner can be conveniently used for commercial and domestic cleaning operations such as in the food industry.Type: GrantFiled: January 12, 2001Date of Patent: January 9, 2007Assignee: Engelhard CorporationInventors: Appadurai Thangaraj, Barry K. Speronello, Timothy D. Wildman
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Patent number: 7087208Abstract: Chlorous acid is generated from a chlorite salt precursor, a chlorate salt precursor, or a combination of both by ion exchange. The ion exchange material facilitates the generation of chlorous acid by simultaneously removing unwanted cations from solution and adding hydrogen ion to solution. Chlorine dioxide is generated in a controlled manner from chlorous acid by catalysis. Chlorine dioxide can be generated either subsequent to the generation of chlorous acid or simultaneously with the generation of chlorous acid. For catalysis of chlorous acid to chlorine dioxide, the chlorous acid may be generated by ion exchange or in a conventional manner. Ion exchange materials are also used to purify the chlorous acid and chlorine dioxide solutions, without causing degradation of said solutions, to exchange undesirable ions in the chlorous acid and chlorine dioxide solutions with desirable ions, such as stabilizing ions, and to adjust the pH of chlorous acid and chlorine dioxide solutions.Type: GrantFiled: August 2, 2001Date of Patent: August 8, 2006Inventors: Allison H. Sampson, Richard L. Sampson
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Patent number: 7077995Abstract: The present invention provides a new method for the in situ generation of chlorine dioxide from a solution of sodium chlorite and carbon dioxide. The present invention produces effective levels of chlorine dioxide without having to resort to the use of hydrochloric acid, sulfuric acid, hydrogen peroxide, chlorine, sulfur dioxide, or methanol. By eliminating the use of toxic and/or hazardous compounds, the present invention provides a safer means for generating and using chlorine dioxide in a wider variety of applications than previously possible. For instance, the present invention can easily be adapted for the treatment of combustion exhaust gases, flue gases, cooling towers, chilled water systems, contaminated groundwater, and agricultural produce or products.Type: GrantFiled: June 14, 2004Date of Patent: July 18, 2006Assignee: ChemTreat, Inc.,Inventors: L. Fred Roensch, Richard H. Tribble, Dick Hilliard
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Patent number: 6913741Abstract: A system and process for oxidizing inorganic or organic species is disclosed. The system and process includes feeding a dilute aqueous alkali metal halite solution into a cation exchange column, wherein the cation exchange column contains a cation exchange material; contacting the dilute aqueous alkali metal halite solution with the cation exchange material to produce an effluent containing halous acid; feeding the effluent containing halous acid into a catalytic reactor containing a catalytic material; and contacting the halous acid containing effluent with the catalytic material to produce a halogen oxide.Type: GrantFiled: September 30, 2002Date of Patent: July 5, 2005Assignee: Halox Technologies, Inc.Inventor: Felice DiMascio
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Patent number: 6840251Abstract: On-Line and Off-Line methods of simultaneously cleaning and disinfecting an industrial water system are described and claimed. The methods involve the addition to the water of the industrial water system of a Compound selected from the group consisting of the alkali salts of chlorite and chlorate and mixtures thereof; and an acid, followed by allowing the water in the industrial water system to circulate for several hours. The reaction of the alkali salts of chlorite and chlorate and acid produces chlorine dioxide in-situ in the water of the industrial water system. The chlorine dioxide kills microorganisms and the acid acts to remove deposits upon the water-contact surfaces of the equipment. An alternative method involves the use of a chelating agent and a biocide. Other possible cleaning and disinfection reagents may be added as needed including corrosion inhibitors, chelating agents, biocides, surfactants and reducing agents.Type: GrantFiled: April 8, 2003Date of Patent: January 11, 2005Assignee: Nalco CompanyInventors: Jasbir S. Gill, Amit Gupta
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Publication number: 20040258607Abstract: 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 can be used to produce chlorine dioxide gas by passing a dilute mixture of chlorine gas and an inert gas through a bed of the pellets.Type: ApplicationFiled: July 15, 2004Publication date: December 23, 2004Inventors: Aaron A. Rosenblatt, Thomas E. McWhorter, Nicholas Franco, Barzin Keramati
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Publication number: 20040232087Abstract: The present invention provides a new method for the in situ generation of chlorine dioxide from a solution of sodium chlorite and carbon dioxide. The present invention produces effective levels of chlorine dioxide without having to resort to the use of hydrochloric acid, sulfuric acid, hydrogen peroxide, chlorine, sulfur dioxide, or methanol. By eliminating the use of toxic and/or hazardous compounds, the present invention provides a safer means for generating and using chlorine dioxide in a wider variety of applications than previously possible. For instance, the present invention can easily be adapted for the treatment of combustion exhaust gases, flue gases, cooling towers, chilled water systems, contaminated groundwater, and agricultural produce or products.Type: ApplicationFiled: June 14, 2004Publication date: November 25, 2004Inventors: L. Fred Roensch, Richard H. Tribble, Dick Hilliard
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Patent number: 6764661Abstract: A device for producing an aqueous chlorine dioxide solution when placed in water. The device includes a membrane shell that defines a compartment which includes one or more dry chemicals (e.g., a metal chlorite and an acid) capable of producing chlorine dioxide gas when exposed to water. Wick means extend into the compartment for absorbing water and transporting water into the compartment such that the chemical(s) in the compartment dissolve in the water and produce chlorine dioxide. In one embodiment, the membrane is formed of a material that allows the passage of gas (e.g., chlorine dioxide) but is impervious to liquid (e.g., water). In another embodiment, the wick means is a wick member which divides the compartment into first and second compartment sections. One chemical (metal chlorite, for example) is contained within the first compartment section and another chemical (acid, for example) is contained within or can easily be placed in the second compartment section.Type: GrantFiled: June 27, 2000Date of Patent: July 20, 2004Assignee: Avantec Technologies, Inc.Inventor: J. Blair Girard
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Patent number: 6761872Abstract: The present invention provides a new method for the in situ generation of chlorine dioxide from a solution of sodium chlorite and carbon dioxide. The present invention produces effective levels of chlorine dioxide without having to resort to the use of hydrochloric acid, sulfuric acid, hydrogen peroxide, chlorine, sulfur dioxide, or methanol. By eliminating the use of toxic and/or hazardous compounds, the present invention provides a safer means for generating and using chlorine dioxide in a wider variety of applications than previously possible. For instance, the present invention can easily be adapted for the treatment of combustion exhaust gases, flue gases, cooling towers, chilled water systems, contaminated groundwater, and agricultural produce or products.Type: GrantFiled: June 26, 2002Date of Patent: July 13, 2004Assignee: ChemTreat, Inc.Inventors: L. Fred Roensch, Richard H. Tribble, Dick Hilliard
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Publication number: 20040104127Abstract: The process and composition for to obtain chlorine dioxide in aqueous solution, ready to use, stabilized in buffer carbonate, being a powerful disinfectant agent, environmental classification, non residual, non toxic and non phytotoxic at use concentrations, characterized because the process understands an analysis of raw materials mainly the chloride metallic, main component for the reaction; it gets ready brines solution, the brine is a solution of sodium chloride at 20° C.-25° C. with soft water, the brine concentrations is at 9 to 15% parts in weight; then the brines are made go by an electrochemical cell, this cell are forming with silicoses iron, the composition is unknown, but is the same panels used in light conversion (DC/AC transformation) panels; the difference of potential is caused in voltaic cells at laminar regime, so that it produces the oxidation of the metallic chloride and to obtain in direct form the active principle of the invention, chlorine dioxide.Type: ApplicationFiled: May 22, 2003Publication date: June 3, 2004Inventor: Juan Luis Araya Rojas