Patents by Inventor James B. Sieja

James B. Sieja 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).

  • Purification of 2-methylglutaronitrile or adiponitrile
    Patent number: 5312959
    Abstract: 2-methylglutaronitrile and adiponitrile are purified by removal of boron residues by adding an alcohol or amino alcohol and then recovering the nitrile by distillation.
    Type: Grant
    Filed: July 12, 1993
    Date of Patent: May 17, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: James B. Sieja, John J. Ostermaier
  • Purification of aminonitriles or diamines
    Patent number: 5192399
    Abstract: Separation of an aliphatic aminonitrile or an aliphatic diamine from a mixture containing the corresponding cyclic, aliphatic, mono-unsaturated amine by adding caustic compound to the mixture and then distilling the aminonitrile or the diamine at a temperature less than 170.degree. C. and at a pressure of less than 1 atmosphere.
    Type: Grant
    Filed: September 10, 1991
    Date of Patent: March 9, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: James B. Sieja
  • Purification of 6-aminocapronitrile
    Patent number: 5162567
    Abstract: Purification of 6-aminocapronitrile by heating a mixture containing same and THA and converting the THA to higher boiling compounds, and then distilling the 6-aminocapronitrile. The time required to convert the THA is reduced if an organic carbonyl compound is present in the mixture during heating.
    Type: Grant
    Filed: February 27, 1992
    Date of Patent: November 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: James B. Sieja
  • Removal of tetrahydroazepine (tha) from 6-aminocapronitrile by reaction with reactive methylene compounds
    Patent number: 5153351
    Abstract: A mixture containing 6-aminocapronitrile is purified by reacting the tetrahydroazepine contained therein with a methylene compound, and then distilling the 6-aminocapronitrile from the resulting mixture.
    Type: Grant
    Filed: January 6, 1992
    Date of Patent: October 6, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: James B. Sieja
  • Purification of 6-aminocapronitrile
    Patent number: 5133838
    Abstract: Purification of 6-aminocapronitrile by reduction of tetrahydroazepine with a hydride, and then distilling the 6-aminocapronitrile at a pot temperature of less than about 200.degree. C.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: July 28, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: James B. Sieja
  • Manufacture of 5-cyanovaleric acid and its esters using cyclic cosolvents
    Patent number: 4950778
    Abstract: Manufacture of 5-cyanovaleric acid by carbonylation of pentenenitriles from a mixture consisting essentially of pentenenitrile, CO and at least one compound of the formula ROH, where R is hydrogen or alkyl of 1 to 6 carbon atoms, and a cyclic urea and/or a cyclic amide, where the combined weight of the cosolvents is between about 70% and 99% of the total weight of the reaction mixture.
    Type: Grant
    Filed: November 8, 1989
    Date of Patent: August 21, 1990
    Assignee: E. I. Du Pont de Nemours & Company
    Inventors: Patrick M. Burke, James B. Sieja
  • Manufacture of 5-cyanovaleric acid and its esters
    Patent number: 4933483
    Abstract: Manufacture of 5-cyanovaleric acid and its esters by carbonylation of pentenenitriles from a mixture consisting essentially of pentenenitrile, CO and at least one compound of the formula R'OH, where R is hydrogen or alkyl of 1 to 6 carbon atoms.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: June 12, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Patrick M. Burke, James B. Sieja
  • Carbonylation of olefinically unsaturated nitriles and acids using a sulfone solvent
    Patent number: 4508660
    Abstract: Process using selected sulfones, e.g., tetramethylenesulfone as solvents in the carbonylation of nitriles, e.g., 3-pentenenitrile and acids, e.g., 3-pentenoic acid to produce highly linear products.
    Type: Grant
    Filed: March 14, 1983
    Date of Patent: April 2, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: James B. Sieja