Patents Assigned to Eka Chemicals Inc.
  • Patent number: 7070710
    Abstract: The invention relates to a novel composition useful as a feed at production of chlorine dioxide, said composition being an aqueous solution comprising from about 1 to about 6.5 moles/liter of alkali metal chlorate, from about 1 to about 7 moles/liter of hydrogen peroxide and at least one of a protective colloid, a radical scavenger or a phosphonic acid based complexing agent, wherein the pH of the aqueous solution is from about 1 to about 4. The invention also concerns a process for producing chlorine dioxide using the novel composition.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: July 4, 2006
    Assignee: Eka Chemicals Inc.
    Inventors: Joel Tenney, Gunilla Jadesjö, Cecilia Bojrup Andresen
  • Patent number: 6790427
    Abstract: The invention concerns a process and an apparatus for continuously producing chlorine dioxide, the process comprising the steps of feeding chlorate ions, acid and hydrogen peroxide as aqueous solutions to a reactor; reducing chlorate ions in the reactor to chlorine dioxide, thereby forming a product stream in the reactor containing chlorine dioxide; feeding motive water to an conductor comprising a nozzle; bringing the motive water to flow through the nozzle and causing it to flow further through the eductor in an at least partially spiral or helical manner, transferring the product stream from the reactor to the eductor and mixing it with the motive water and thereby forming a diluted aqueous solution containing chlorine dioxide, and; withdrawing the diluted aqueous solution containing chlorine dioxide from the eductor.
    Type: Grant
    Filed: June 25, 2001
    Date of Patent: September 14, 2004
    Assignee: Eka Chemicals, Inc.
    Inventors: Gary Charles, Michael Burke
  • Patent number: 6576213
    Abstract: The invention relates to method of producing chlorine dioxide comprising the steps of: providing a reactor with an aqueous acidic reaction medium containing chlorate ions; reacting said chlorate ions with hydrogen peroxide as a reducing agent in such proportions that chlorine dioxide is formed; withdrawing the chlorine dioxide from the reaction medium; wherein the content of tin in the reaction medium at steady state is maintained below 20 mg Sn per kg reaction medium.
    Type: Grant
    Filed: June 30, 1995
    Date of Patent: June 10, 2003
    Assignee: EKA Chemicals, Inc.
    Inventors: Helena Falgén, Johan Landfors, Kaj Kangasniemi
  • Patent number: 5908532
    Abstract: A method for destroying chlorine dioxide includes irradiating the chlorine dioxide to effect conversion to chlorine and then reacting at least part of the resulting chlorine to form chloride.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: June 1, 1999
    Assignee: EKA Chemicals, Inc.
    Inventor: Joel Tenney
  • Patent number: 5565182
    Abstract: The invention relates to a process of producing chlorine dioxide using, in a first alternative atmospheric pressure and hydrogen peroxide in the reaction medium optionally with an electrolytic cell. In a second alternative, either atmospheric or subatmospheric pressure is used in the reaction medium together with an organic or inorganic reducing agent and an electrolytic cell.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 15, 1996
    Assignee: EKA Chemicals, Inc.
    Inventor: John C. Sokol
  • Patent number: 5176891
    Abstract: A method for the production of water soluble polyaluminosilicate microgels by the reaction of dilute polysilicic acid solutions with dilute solutions of alkali metal aluminates.
    Type: Grant
    Filed: May 17, 1991
    Date of Patent: January 5, 1993
    Assignee: Eka Chemicals, Inc.
    Inventor: John D. Rushmere