Patents by Inventor Bengt G. Hultman

Bengt G. Hultman 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 inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes
    Patent number: 4466861
    Abstract: A process is provided for inhibiting the formation of deposits in the course of pulping lignocellulosic material and in the treating of cellulose pulp, by addition to the cellulose pulping or treating process of compounds of polyvalent metals other than aluminum and manganese capable of complexing deposit-forming anions, thereby maintaining the deposit-forming anions in solution in the form of a liquor-soluble complex.
    Type: Grant
    Filed: October 14, 1981
    Date of Patent: August 21, 1984
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Bengt G. Hultman, Rolf C. Nilsson
  • Apparatus for controlling the degree of causticization in the preparation of white liquor from the chemicals recovered from black liquor
    Patent number: 4311666
    Abstract: Apparatus is provided for controlling the degree of causticization of white liquor in its preparation from green liquor by the addition of calcium oxide, which comprises determining the sodium carbonate concentration of green liquor fed to the causticization; determining the sodium carbonate concentration of white liquor resulting from the causticization; and controlling the degree of causticization within a predetermined range while taking both sodium carbonate concentrations into account, so as to maintain the degree of causticization of the white liquor within the range despite variations in sodium carbonate concentration of the green liquor and variations in calcium oxide content of the calcium oxide added for causticization.
    Type: Grant
    Filed: February 11, 1980
    Date of Patent: January 19, 1982
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Bengt G. Hultman, Erik A. Berglund
  • Process for controlling the degree of causticization in the preparation of white liquid from the chemicals recovered from black liquor
    Patent number: 4236960
    Abstract: Process is provided for controlling the degree of causticization of white liquor in its preparation from green liquor by the addition of calcium oxide, which comprises determining the sodium carbonate concentration of green liquor fed to the causticization; determining the sodium carbonate concentration of white liquor resulting from the causticization; and controlling the degree of causticization within a predetermined range while taking both sodium carbonate concentrations into account, so as to maintain the degree of causticization of the white liquor within the range despite variations in sodium carbonate concentration of the green liquor and variations in calcium oxide content of the calcium oxide added for causticization.
    Type: Grant
    Filed: June 27, 1979
    Date of Patent: December 2, 1980
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Bengt G. Hultman, Erik A. Berglund
  • Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes
    Patent number: 4218284
    Abstract: A process is provided for inhibiting the formation of deposits in the course of pulping lignocellulosic material and in the treating of cellulose pulp, by addition to the cellulose pulping or treating process of compounds of polyvalent metals capable of complexing deposit-forming anions, thereby maintaining the deposit-forming anions in the form of a liquor-soluble complex.
    Type: Grant
    Filed: May 3, 1978
    Date of Patent: August 19, 1980
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Bengt G. Hultman, Rolf C. Nilsson
  • Method for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in a liquor containing chemicals reactive with the delignifying and/or bleaching chemical
    Patent number: 4192708
    Abstract: A method is provided for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in an aqueous liquor containing at least one chemical reactive with such active chemical, which comprises determining the amount of active chemical consumed by the chemical reactive with the active chemical in the liquor; adding the active chemical to the cellulose pulp suspension; and then after a predetermined time interval determining the amount of active chemical consumed by the chemical and cellulose pulp reactive with the active chemical in the liquor; from these determinations determining the amount of active chemical consumed by the pulp; and then carrying out the delignification and/or bleaching with an amount of active chemical adjusted according to the amount of active chemical consumed by the pulp.
    Type: Grant
    Filed: February 9, 1977
    Date of Patent: March 11, 1980
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: John R. Bergstrom, Bengt G. Hultman, Astrid T. P. Dalborg