Patents by Inventor Ludovicus A. L. Kleintjens

Ludovicus A. L. Kleintjens 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 purifying a rubber
    Patent number: 4725667
    Abstract: The invention relates to a process for purifying ethylene-alkene-diene rubbers by extraction with an extractant chosen from substances with a critical temperature below 435.degree. K. at a temperature above the critical temperature of the extractant and a pressure above the critical pressure of the extractant.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: February 16, 1988
    Assignee: Stamicarbon B.V.
    Inventor: Ludovicus A. L. Kleintjens
  • Process of recovering purified benzoic acid
    Patent number: 4654437
    Abstract: Process for recovering benzoic acid purified by means of a supercritical extraction of solid benzoic acid, characterized in that after the extraction the purified benzoic acid is remelted at least in part and is carried off from the melting device in at least partly liquid form.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: March 31, 1987
    Assignee: Stamicarbon, B.V.
    Inventors: Josephus J. P. M. Goorden, Antonius J. F. Simons, Ludovicus A. L. Kleintjens
  • Process and device for purifying benzoic acid
    Patent number: 4652675
    Abstract: Process for purifying benzoic acid obtained by oxidation of toluene with a gas containing molecular oxygen, which purification is carried out at a pressure of at least 3 MPa by means of a supercritical extraction using a gas or gas mixture the critical temperature of which is lower than 435 K. The process being characterized in that the benzoic acid to be purified is supplied in a liquid state to a crystallizer in which the prevailing temperatures is below the solidification temperature of the benzoic acid and in which the benzoic acid is treated during and possibly after the crystallization process with the said gas or gas mixture.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: March 24, 1987
    Assignee: Stamicarbon B.V.
    Inventors: Josephus J. P. M. Goorden, Antonius J. F. Simons, Ludovicus A. L. Kleintjens
  • 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