Patents by Inventor Petrus H. J. Janssen

Petrus H. J. Janssen 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 preparation of a lactam
    Patent number: 4560760
    Abstract: Disclosed is a process for preparing a lactam which consists essentially in the reductive amination in the gas phase of an oxoalkane carboxylic acid having the formula ##STR1## or an alkyl ester thereof, wherein R is an alkyl group having from 1 to 4 carbon atoms and n varies from 2 to 3, and wherein the reaction is carried out:A. in an atmosphere of hydrogen, andB. in the presence of a gas phase reactant selected from the group consisting of gaseous ammonia and a vaporized primary amine, andC. in the presence of a hydrogenation catalyst promoted with an alkali metal.The alkali metal particularly preferred as a promoter is sodium.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: December 24, 1985
    Assignee: Stamicarbon B.V.
    Inventors: Roland E. van der Stoel, Marcel A. R. Bosma, Petrus H. J. Janssen, Cornelis G. M. van de Moesdijk
  • Process for the preparation of a 2-alkylpyrrole
    Patent number: 4485243
    Abstract: A process is described for the catalytic gas phase reduction of 4-oxoalkanenitriles to form 2-alkylpyrroles in high yields and conversions.
    Type: Grant
    Filed: June 1, 1982
    Date of Patent: November 27, 1984
    Assignee: Stamicarbon B.V.
    Inventors: Roland E. van der Stoel, Petrus H. J. Janssen, Cornelis G. M. van de Moesdijk
  • Process for the preparation of indole and skatole
    Patent number: 4473699
    Abstract: Indole, and/or methyl-substituted indoles are described as prepared from the corresponding 2-(cyanomethyl)cyclohexanone starting material through a catalytic reaction in the presence of hydrogen, using a metal, or metal compound, of Group VIII or Group Ib of the Periodic Table. The reaction is carried out at an elevated temperature at high conversion to yield the corresponding indole and (in some cases) tetra- or hexahydroindoles.
    Type: Grant
    Filed: May 11, 1982
    Date of Patent: September 25, 1984
    Assignee: Stamicarbon B.V.
    Inventors: Roland E. van der Stoel, Petrus H. J. Janssen, Cornelis G. M. van de Moesdijk
  • Process for the preparation of a 5-alkyl-butyrolactone
    Patent number: 4420622
    Abstract: The preparation of 5-alkyl-butyrolactones is described using C.sub.8 hydrocarbon levulinate esters, with side-chain alkyl substituents of up to 4 carbon atoms as starting material, with the reaction being conducted with hydrogen at a temperature of from 150.degree. to 325.degree. C., in the gas phase, and in the presence of a hydrogenation catalyst composed of metals of Group VIII or Group Ib of the Periodic Table. The process provides extremely high conversion rates and lactone yields, the prolonged catalyst activity.
    Type: Grant
    Filed: May 21, 1982
    Date of Patent: December 13, 1983
    Assignee: Stamicarbon B.V.
    Inventors: Cornelis G. M. van de Moesdijk, Petrus H. J. Janssen