Patents Assigned to Allegheny Energy, Inc.
  • Methods and apparatus for recovering gypsum and magnesium hydroxide products
    Patent number: 7419643
    Abstract: The present invention provides methods and apparatus for treating flue gas containing sulfur dioxide using a scrubber, and more particularly relates to recovering gypsum and magnesium hydroxide products from the scrubber blowdown. The gypsum and magnesium hydroxide products are created using two separate precipitation reactions. Gypsum is crystallized when magnesium sulfate reacts with calcium chloride. Magnesium hydroxide is precipitated when magnesium chloride from the gypsum crystallization process reacts with calcium hydroxide. The process produces a high quality gypsum with a controllable pH and particle size distribution, as well as high quality magnesium hydroxide.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: September 2, 2008
    Assignee: Allegheny Energy, Inc.
    Inventor: Dennis K. Jones
  • Methods and apparatus for recovering gypsum and magnesium hydroxide
    Patent number: 7179438
    Abstract: The present invention provides methods and apparatus for treating flue gas containing sulfur dioxide using a scrubber, and more particularly relates to recovering gypsum and magnesium hydroxide products from the scrubber blowdown. The gypsum and magnesium hydroxide products are created using two separate precipitation reactions. Gypsum is crystallized when magnesium sulfate reacts with calcium chloride. Magnesium hydroxide is precipitated when magnesium chloride from the gypsum crystallization process reacts with calcium hydroxide. The process produces a high quality gypsum with a controllable pH and particle size distribution, as well as high quality magnesium hydroxide.
    Type: Grant
    Filed: January 3, 2006
    Date of Patent: February 20, 2007
    Assignee: Allegheny Energy, Inc.
    Inventor: Dennis K. Jones