Patents by Inventor Hubertus M. J. Grooten

Hubertus M. J. Grooten 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 pharmaceutical benzoic acid
    Patent number: 4547587
    Abstract: Pharmaceutical benzoic acid is prepared from raw benzoic acid made of oxidation of toluene with an oxygen containing gas, the process is characterized in that the oxidation reaction product is contacted with at least 1 m.sup.3 per kg of benzoic acid of a gas with a critical temperature lower than 435 K by passing this gas through the oxidation reaction product at a flow rate of at least 1 m.sup.3 per hour per kg of benzoic acid at a temperature of 340-600 K. and a pressure of at least 3 MPa. The pharmaceutical benzoic acid is separated from the mixture by cooling it to 315-370 K. at a pressure of 3-300 MPa.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: October 15, 1985
    Assignee: Stamicarbon B.V.
    Inventors: Ludovicus A. L. Kleintjens, Hubertus M. J. Grooten
  • Process for the preparation of benzoic acid
    Patent number: 4539425
    Abstract: Benzoic acid is prepared by oxidation of toluene with an oxygen containing gas, the process is characterized in that the oxidation reaction product is subjected to an extraction with a gas of which the critical temperature is lower than 435 K, this being effected by passing it during at least 1 minute over or through the oxidation reaction product at a flow rate of at least 1 m.sup.3 gas per hour per kg of benzoic acid at a temperature of 285-340 K and at a pressure of at least 3 MPa.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: September 3, 1985
    Assignee: Stamicarbon B.V.
    Inventors: Ludovicus A. L. Kleintjens, Hubertus M. J. Grooten