Patents by Inventor Alpen K. Pandya

Alpen K. Pandya 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).

  • Production of high purity aromatic carboxylic acid by oxidation in benzoic acid and water solvent
    Patent number: 6562997
    Abstract: Processes for the production of aromatic carboxylic acids is disclosed. The aromatic acids are produced by the liquid phase oxidation of a suitable acid precursor in a reaction medium comprising benzoic acid. According to one embodiment, the oxidation is carried out under plug-flow reaction conditions in a plug-flow reactor. The plug-flow conditions can be achieved by the use of a series of continuous stirred tank reactors. In another embodiment, the oxidation is carried out in two continuous stirred tank reactors fluidly connected in series. The preferred oxidation products are terephthalic acid, isophthalic acid, trimellitic acid, 2,6-naphthalene dicarboxylic acid, 1,5-napthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid and phthalic acid.
    Type: Grant
    Filed: January 19, 2001
    Date of Patent: May 13, 2003
    Assignee: BP Corporation North America Inc.
    Inventors: David L. Sikkenga, Alpen K. Pandya, Ian C. Zaenger, Kenneth J. Abrams, Thomas M. Bartos
  • Production of high purity aromatic carboxylic acid by oxidation in benzoic acid and water solvent
    Publication number: 20010041811
    Abstract: Processes for the production of aromatic carboxylic acids is disclosed. The aromatic acids are produced by the liquid phase oxidation of a suitable acid precursor in a reaction medium comprising benzoic acid. According to one embodiment, the oxidation is carried out under plug-flow reaction conditions in a plug-flow reactor. The plug-flow conditions can be achieved by the use of a series of continuous stirred tank reactors. In another embodiment, the oxidation is carried out in two continuous stirred tank reactors fluidly connected in series. The preferred oxidation products are terephthalic acid, isophthalic acid, trimellitic acid, 2,6-naphthalene dicarboxylic acid, 1,5-napthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid and phthalic acid.
    Type: Application
    Filed: January 19, 2001
    Publication date: November 15, 2001
    Inventors: David L. Sikkenga, Alpen K. Pandya, Ian C. Zaenger, Kenneth J. Abrams, Thomas M. Bartos