Light Metal Or Nitrogen Containing Material Utilized (e.g., Ceric Ammonium Nitrate Catalyst Utilized, Etc.) Patents (Class 552/270)
  • Method for producing 2-(4-methyl-3-pentenyl) anthraquinone
    Patent number: 6399795
    Abstract: A method for producing 2-(4-methyl-3-pentenyl)anthraquinone (IHEAQ) that includes a Diels-Alder addition of naphtho-1,4-quinone and myrcene and an oxidation of the resulting adduct. The oxidation step is carried out in the presence of a solvent mixture that contains a polar and a nonpolar solvent. The oxidation takes place with air or an O2-containing gas in the presence of a combination of a strong inorganic base and an organic, especially a nitrogen-containing base. The method leads to a higher space-time yield and higher product purity.
    Type: Grant
    Filed: July 24, 2001
    Date of Patent: June 4, 2002
    Assignee: Degussa AG
    Inventors: Jürgen Glenneberg, Holger Sauerstein, Hubert Angert
  • Lignin derived quinonic compound mixtures useful for the delignification of cellulosic materials
    Patent number: 5049236
    Abstract: A method for the preparation of a mixture of fused ring quinone type compounds from lignin and lignin-derived substances. The mixture of fused ring quinone compounds has been found useful in the wood pulping process as an accelerator in the degradation and separation of wood lignin from the other principal wood constituents, cellulose and hemicellulose.
    Type: Grant
    Filed: August 23, 1988
    Date of Patent: September 17, 1991
    Assignee: Institute of Paper Science and Technology, Inc.
    Inventors: Donald R. Dimmel, John C. Wozniak