Patents by Inventor Ruth A. Hazel

Ruth A. Hazel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for purification of carboxylic acids
    Patent number: 5387713
    Abstract: Carboxylic acids produced by carbonylation and having iodide and oxidisable impurities are purified by contacting with hydrogen peroxide and recovering the purified acid by distillation or evaporation. Preferably a strong acid such as sulphuric acid is used as a catalyst. Product contamination by sulphur from sulphuric acid and by excess peroxide may be reduced by the use of metal salts in the recovery step.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: February 7, 1995
    Assignee: BP Chemicals Limited
    Inventors: John Cook, Ruth A. Hazel, Peter J. Wilson