Patents by Inventor Kondapuram Vijaya Raghavan

Kondapuram Vijaya Raghavan 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 the production of nitroarenes with high para-selectivity from monosubstituted aromatic hydrocarbons using alumino-silicates as catalysts
    Patent number: 6034287
    Abstract: The present invention relates to a process for the production of nitroarenes with high para-selectivity from monosubstituted aromatic hydrocarbons using aluminosilicates as catalysts, which comprises nitration of monosubstituted aromatic hydrocarbons using aluminosilicates of different ratios wherein Si/Al ranges between 5 to 1000 and the said aluminosilicates being manifested in the form of variety of zeolites and K10 montmorillonite as catalysts using nitric acid in the molar ratio of nitric acid to monosubstituted aromatic hydrocarbons ranging between 0.25 to 2.5 at a temperature in the range of 30-160.degree. C. for a period ranging between 0.25 to 3.0 h and followed by continuous removal of water formed from the reaction mixture with a Dean-Stark apparatus and recovery of the product mixture by concentration of the reaction mixture after separation of the catalyst by filtration.
    Type: Grant
    Filed: November 9, 1998
    Date of Patent: March 7, 2000
    Assignee: Coucil of Scientific and Industrial Research
    Inventors: Boyapati Manoranjan Choudary, Mutyala Sateesh, Mannepalli Lakshmi Kantam, Kottapalli Koteswara Rao, Kompella Vishweshwar Ram Prasad, Kondapuram Vijaya Raghavan