Patents by Inventor Andrew Szalkiewicz

Andrew Szalkiewicz 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).

  • Selective hydrogenation of dinitrile to omega-aminonitrile and supported rhodium-containing catalyst therefor
    Patent number: 4389348
    Abstract: A dinitrile is hydrogenated to an omega-aminonitrile with hydrogen in an aprotic solvent with a supported rhodium catalyst and ammonia present. The catalyst is prepared by hydrolyzing a rhodium (III) halide with strong aqueous base at elevated temperatures, drying the supported rhodium hydroxide at elevated temperatures and hydrogenating the dried product at elevated temperatures. High conversions, selectivity to aminonitrile and catalyst recyclability are achieved.
    Type: Grant
    Filed: October 26, 1981
    Date of Patent: June 21, 1983
    Assignee: Allied Corporation
    Inventors: Steven E. Diamond, Frank Mares, Andrew Szalkiewicz
  • Selective hydrogenation of dinitrile to omega-aminonitrile catalyzed by rhodium organonitrogen complex catalyst
    Patent number: 4362671
    Abstract: A dinitrile is reacted with hydrogen in the presence of a solvent and a catalyst to form an omega-aminonitrile such as epsilon-aminocapronitrile at high selectivity. The catalyst is a rhodium complex of the formula (RR'Rh)A reacted with a strong base such as sodium hydroxide. R is derived from a diene such as 1,5-hexadiene. R' is a heterocyclic containing an aromatic ring nitrogen. A is a complex monovalent anion such as hexafluorophosphate.
    Type: Grant
    Filed: October 26, 1981
    Date of Patent: December 7, 1982
    Assignee: Allied Corporation
    Inventors: Steven E. Diamond, Frank Mares, Andrew Szalkiewicz