Patents by Inventor Herman W. Kouwenhoven

Herman W. Kouwenhoven 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 nitrobenzene
    Patent number: 5334781
    Abstract: The invention concerns a process for the preparation of nitrobenzene from benzene and nitric acid, wherein catalysts are applied based on the zeolite clinoptilolite.
    Type: Grant
    Filed: January 15, 1993
    Date of Patent: August 2, 1994
    Assignee: CU Chemie Uetikon AG
    Inventors: Herman W. Kouwenhoven, Leopoldo Bertea, Roel Prins
  • Process for the preparation of nitrobenzene
    Patent number: 5324872
    Abstract: The invention concerns a gasphase process for the preparation of nitrobenzene from benzene and nitric acid, wherein catalysts are applied based on the zeolite mordenite.
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: June 28, 1994
    Assignee: CU Chemie Uetikon AG
    Inventors: Herman W. Kouwenhoven, Leopoldo Bertea, Roel Prins
  • Method for the regeneration of spent alumina-based catalysts
    Patent number: 4795726
    Abstract: Method for the regeneration of spent alumina-based catalysts wherein the catalyst firstly is treated with steam at elevated temperature in order to remove at least part of the sulphur; subsequently with an oxygen-containing gas at elevated temperature, in order to burn off carbonaceous matter and finally with a basic medium.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: January 3, 1989
    Assignee: Shell Oil Company
    Inventors: Hennie Schaper, Herman W. Kouwenhoven
  • Crystalline silicates and hydrocarbon-conversion processes employing same
    Patent number: 4238318
    Abstract: Novel crystalline silicates which in dehydrated form have the composition in terms of moles of the oxides: (1.0.+-.0.3)(R).sub.2/n O.[aFe.sub.2 O.sub.3.bAl.sub.2 O.sub.3.cGa.sub.2 O.sub.3.y(dSiO.sub.2.eGeO.sub.2)], wherein R is one or more mono- or bivalent cations and a, b, c, d, e, y and n are as defined hereinafter are disclosed. The thermally stable silicates are suitably employed as extracting agents, drying agents, ion exchange agents, catalysts and catalyst carriers.
    Type: Grant
    Filed: October 10, 1979
    Date of Patent: December 9, 1980
    Assignee: Shell Oil Company
    Inventors: Herman W. Kouwenhoven, Willem H. J. Stork
  • Crystalline silicates and process of preparation
    Patent number: 4208305
    Abstract: Novel crystalline silicates which in dehydrated form having the composition in terms of moles of the oxides: (1.0.+-.0.3) (R).sub.2/n O. [a Fe.sub.2 O.sub.3. b Al.sub.2 O.sub.3. c Ga.sub.2 O.sub.3. y(dSiO.sub.2. eGeO.sub.2)], wherein R is one or more mono- or bivalent cations and a, b, c, d, e, y and n are as defined hereinafter are disclosed. The thermally stable silicates are suitably employed as extracting agents, drying agents, ion exhange agents, catalysts and catalyst carriers.
    Type: Grant
    Filed: December 7, 1977
    Date of Patent: June 17, 1980
    Assignee: Shell Oil Company
    Inventors: Herman W. Kouwenhoven, Willem H. J. Stork