Patents by Inventor Pieter H. Berben

Pieter H. Berben 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 preparing secondary alkylamine
    Patent number: 5235108
    Abstract: This invention relates to a process for preparing secondary alkylamine by selective hydrogenation of alkylnitrile using a nickel-containing catalyst which contains copper as promoter, said catalyst having a selectivity, as herein defined, of not more than 8.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: August 10, 1993
    Assignee: Engelhard De Meern B.V
    Inventors: Frederik Borninkhof, Eugene G. M. Kuijpers, Pieter H. Berben
  • Process for the selective oxidation of gaseous sulfur-containing compounds, hydrogen sulfide in particular, to form elemental sulfur
    Patent number: 5037629
    Abstract: The claimed invention relates to a catalytic process for the selective oxidation of sulfur-containing compounds, in particular hydrogen sulfide, to form elemental sulfur. The catalyst includes a carrier of which the surface exposed to the gaseous phase does not exhibit alkaline properties under the reaction conditions, and a catalytically active material applied thereto or formed thereon. The specific surface area of the catalyst is less than 20 m.sup.2 /g catalyst, with less than 10% of the total pore volume having a pore radius between 5 and 500 .ANG.. A process for preparing the catalyst is also disclosed.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: August 6, 1991
    Assignees: Veg-Gasinstituut N.V., Comprimo B.V.
    Inventors: Pieter H. Berben, John W. Geus
  • Process for recovering sulfur from sulfur-containing gases
    Patent number: 4988494
    Abstract: The invention is directed to a process for the recovery of sulfur from a hydrogen sulfide containing gas, which comprises oxidizing hydrogen sulfide with oxygen, and then reacting the product gas of this oxidation further by using at least two catalytic stages, in accordance with the equation: 2H.sub.2 S+SO.sub.2 .revreaction.2H.sub.2 O+3/n S.sub.n. In order to improve the process and the process control, the invention is characterized in that the H.sub.2 S concentration in the gas leaving the last catalytic stage is controlled to have a value ranging between 0.8 and 3% by volume by reducing the quantity of combustion or oxidation air passed to the oxidation stage and/or causing a portion of the hydrogen sulfide containing feedstock gas to bypass the oxidation stage and to be added to the gas flowing to a catalytic stage.
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: January 29, 1991
    Assignees: VEG-Gasinstituut N.V., Comprino, B.V.
    Inventors: Jan A. Lagas, Johannes Borsboom, Pieter H. Berben, John W. Geus
  • Catalyst for the selective oxidation of sulfur containing compounds to elemental sulfur
    Patent number: 4818740
    Abstract: The invention relates to a catalyst for the selective oxidation of sulfur-containing compounds, in particular hydrogen sulfide, to form elemental sulfur, comprising a carrier of which the surface exposed to the gaseous phase does not exhibit alkaline properties under the reaction conditions, and a catalytically active material applied thereto or formed thereon. According to the invention the catalyst is characterized in that the specific surface area of the catalyst is less than 20 m.sup.2 /g catalyst, with less than 10% of the total pore volume having a pore radius between 5 and 500 .ANG.. The invention also relates to a process for preparing the catalyst, and to processes using it.
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: April 4, 1989
    Assignees: VEG-Gasinstituut N.V., Comprimo B.V.
    Inventors: Pieter H. Berben, John W. Geus