Patents Assigned to Bechtel Group, Incorporated
  • Patent number: 4804523
    Abstract: Efficient removal of sulfur dioxide from a flue gas stream is achieved in a scrubber using a recirculating aqueous stream containing magnesium hydroxide and magnesium sulfite which together act as SO.sub.2 absorbents. Magnesium sulfite is derived from magnesium hydroxide, which is the product of a reaction between soluble magnesium from the seawater and calcium hydroxide added to the scrubbing system. Magnesium sulfite and bisulfite are oxidized to magnesium sulfate by the introduction of air. Magnesium sulfate is converted back to magnesium hydroxide by reaction with additional calcium hydroxide, with gypsum as a by-product. Gypsum is soluble in large amounts of seawater and may be returned to the ocean without adverse environmental impact.
    Type: Grant
    Filed: June 17, 1987
    Date of Patent: February 14, 1989
    Assignee: Bechtel Group, Incorporated
    Inventors: Jack Z. Abrams, August D. Benz, Leon Awerbuch, Stanley J. Zaczek, John Haidinger