Patents Represented by Attorney Diderico van Byl

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  • Method for producing substituted nitro benzoic acids by oxidation of corresponding nitro toluenes, nitrol benzyl alcohols, esters and/or ethers
    Patent number: 6900349
    Abstract: The present invention relates to the preparation of nitrobenzoic acids by oxidizing particular nitrotoluenes, nitrobenzyl alcohols, esters and/or ethers in the presence of nitric acid at elevated temperature and elevated pressure. It has been found that the particular nitrotoluenes, nitrobenzyl alcohols, esters and/or ethers may be oxidized particularly reliably and in high yields using nitric acid to the benzoic acid derivatives when they are metered into the nitric acid.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: May 31, 2005
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhard Langer, Lars Rodefeld, Karl Heinz Neumann