Patents by Inventor Mario G. R. T. de Cooker

Mario G. R. T. de Cooker 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 urea
    Patent number: 4540813
    Abstract: A process for the preparation of urea from ammonia and carbon dioxide at an elevated temperature and pressure having a reaction zone and a stripping zone. In the reaction zone, carbon dioxide and a portion of the ammonia are converted to ammonium carbamate, and a portion of the ammonium carbamate is converted to urea, the combined conversions resulting in a net formation of heat. In the stripping zone, a urea product stream containing unconverted ammonium carbamate is heated by heat exchange with the reaction zone to decompose a portion of the ammonium carbamate. In the reaction zone, the conversion of ammonium carbamate into urea is continued until the quantity of urea formed is at least 50 percent of that quantity of urea that would be obtained at equilibrium under the reaction conditions present in the reaction zone.
    Type: Grant
    Filed: May 2, 1983
    Date of Patent: September 10, 1985
    Assignee: Unie van Kunstmestfabrieken B.V.
    Inventors: Petrus J. M. van Nassau, Andreas J. Biermans, Kees Jonckers, Mario G. R. T. de Cooker
  • Process for removing alkali metal carboxylates from mixtures containing a cycloakanone and a cycloalkanol obtained in oxidation of cycloalkanes
    Patent number: 4326085
    Abstract: The invention relates to a method for removal of alkali metal carboxylates from mixtures which contain a cycloalkanone and a cycloalkanol, in particular cyclohexanone and cyclohexanol, and which have been obtained in oxidation in the liquid phase of the corresponding cycloalkane with gas containing molecular oxygen.According to the invention, alkali metal carboxylates are removed from such mixtures containing a cycloalkanone and a cycloalkanol by washing the mixture with an aqueous acid solution, in particular an aqueous solution of carboxylic acid with 1-6 carbon atoms per molecule.The invention provides a solution to the problem of the so-called alkali entrainment, which leads to loss of cycloalkanone owing to condensation into undesired high-boiling by-products in the following distillation for gaining pure cycloalkone. This substantial loss is prevented by the method according to the invention.
    Type: Grant
    Filed: June 11, 1980
    Date of Patent: April 20, 1982
    Assignee: Stamicarbon B.V.
    Inventor: Mario G. R. T. De Cooker
  • Process for preparing cyanuric acid
    Patent number: 4266052
    Abstract: An improved process for the preparation of cyanuric acid in which urea/biuret is converted into cyanuric acid but wherein the co-production of the impurities, ammelide and ammeline is significantly reduced. Cyanuric acid is prepared by heating urea/biuret in a suitable polar organic solvent in the presence of an ammonium-, alkali metal- or alkaline-earth metal nitrate.
    Type: Grant
    Filed: January 8, 1980
    Date of Patent: May 5, 1981
    Assignee: Stamicarbon, B.V.
    Inventors: Mario G. R. T. de Cooker, Anita G. W. G. Haemers
  • Process for preparing cyanuric acid
    Patent number: 4181801
    Abstract: An improved process for the preparation of cyanuric acid from urea/biuret. The cyanuric acid mass comprised of cyanuric acid and retained residual solvent is discharged from the reaction vessel and is fed to a heated fluidized bed of cyanuric acid particles for the removal of residual retained solvent.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: January 1, 1980
    Assignee: Stamicarbon, B.V.
    Inventors: Mario G. R. T. de Cooker, Anita G. W. G. Haemers
  • Process for preparing cyanuric acid
    Patent number: 4112232
    Abstract: An improved process for preparing cyanuric acid by heating urea or biuret or a mixture thereof in a solvent to produce a cyanuric acid product of high purity.
    Type: Grant
    Filed: September 19, 1977
    Date of Patent: September 5, 1978
    Assignee: Stamicarbon, B.V.
    Inventor: Mario G. R. T. de Cooker
  • Method of preparing cyanuric acid
    Patent number: 4109089
    Abstract: An improved process for preparing cyanuric acid by heating urea or biuret or a mixture thereof in a solvent to produce a cyanuric acid product of high purity.
    Type: Grant
    Filed: September 19, 1977
    Date of Patent: August 22, 1978
    Assignee: Stamicarbon, B.V.
    Inventors: Mario G. R. T. de Cooker, Antonius J. M. Hermus