Processes Of Forming Anthraquinone Per Se Or Enolic Form Thereof Utilizing Heavy Metal Containing Material (e.g., Vanadium Catalyst Utilized, Etc.) Patents (Class 552/269)
Light metal or nitrogen containing material utilized (e.g., ceric ammonium nitrate catalyst utilized, etc.) (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
  • Method for the delignification of lignocellulosic material by adding a dialkyl substituted octahydroanthraquinone
    Patent number: 6156155
    Abstract: The present invention provides a method for the synthesis of substituted octahydroanthraquinones and substituted anthraquinones which are effective for pulping of lignocellulosics.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: December 5, 2000
    Assignee: Institute of Paper Science and Technology, Inc.
    Inventor: Donald R. Dimmel
  • Process for the catalytic oxidation of aromatic compounds
    Patent number: 5616734
    Abstract: The invention relates to the use of compounds of the formula IR.sup.1.sub.a Re.sub.b O.sub.c (I),where a is from 1 to 6, b is from 1 to 4 and c is from 1 to 14 and the sum of a, b and c is in accordance with the valence of from 5 to 7 of the rhenium, with the proviso that c is not greater than 3.multidot.b, and where R.sup.1 is identical or different and is an aliphatic hydrocarbon radical having from 1 to 10 carbon atoms, an aromatic hydrocarbon radical having from 6 to 10 carbon atoms or an arylalkyl radical having from 7 to 9 carbon atoms, with the radicals R.sup.1 being able, if desired, to be identically or differently substituted independently of one another and, in the case of .sigma.-bonded radicals, at least one hydrogen atom still being bonded to the carbon atom in the .alpha. position, as catalysts for the oxidation of electron-rich aromatic compounds and their derivatives and to a process for the oxidation of electron-rich aromatic compounds which comprises oxidizing electron-rich C.sub.6 -C.sub.
    Type: Grant
    Filed: January 25, 1995
    Date of Patent: April 1, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wolfgang A. Herrmann, Joao D. G. Correia, Richard Fischer, Waldemar Adam, Jianhua Lin, Chantu R. Saha-Moller, Masao Shimizu
  • Method for the delignification of wood pulp utilizing fused ring quinone compounds prepared from lignin or lignin derived substances
    Patent number: 5002634
    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: September 25, 1989
    Date of Patent: March 26, 1991
    Assignee: Institute of Paper Science and Technology, Inc.
    Inventors: Donald R. Dimmel, John C. Wozniak