Patents Represented by Attorney Alan Klaasen

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  • Method for removing calcium from crude oil
    Patent number: 6905593
    Abstract: A calcium-containing hydrocarbonaceous material is treated with an aqueous mixture, comprising acetate ion and an alkaline material and having a pH in the range of 3.0 to 5.0, in order to extract at least a portion of the calcium from the hydrocarbonaceous material into the aqueous phase. Acetic acid is a suitable source of acetate ion. Ammonium hydroxide, sodium hydroxide and potassium hydroxide are example alkaline materials.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: June 14, 2005
    Assignee: Chevron U.S.A.
    Inventors: Donald L. Kuehne, Lisa P. Hawker, David C. Kramer