Patents Assigned to Kerr
  • Patent number: 3981974
    Abstract: The present invention relates to a method for producing an alkali metal pyrophosphate useful, for example, as a plant food. Broadly, the method comprises reacting an alkali metal nitrate and aqueous phosphoric acid in the presence of catalytic amount of a metal oxide at a temperature of at least about 700.degree.C to produce a substantially pure alkali metal pyrophosphate and gaseous reaction products.
    Type: Grant
    Filed: May 20, 1974
    Date of Patent: September 21, 1976
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: Peter Coad, Edward Conley Murray, Homer Charles Reed
  • Patent number: 3975495
    Abstract: The present invention provides a method for recovering niobium from a hydrochloric acid solution which contains niobium and vanadium and which may also contain other metals such as, for example, zirconium, titanium, iron, chromium and aluminum. Broadly, the method comprises heating such a solution at a low pH for a period of time sufficient to form a niobium-containing precipitate substantially free of vanadium. Preferably, the solution is heated in the presence of a small amount of sulfuric acid. The precipitate then is recovered from the solution.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: August 17, 1976
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: Paul David Bowerman