Patents Assigned to Tenneco Canada Inc. (ERCO division)
  • Steel making flux
    Patent number: 4738719
    Abstract: Phosphorus furnace slag is used as a ladle flux and/or as a tundish flux in the continuous casting of steel. The phosphorus furnace slag uniquely combines the properties of thermal insulation, oxidation protection and inclusion absorption necessary to function satisfactorily as a ladle flux and/or as a tundish flux.
    Type: Grant
    Filed: April 7, 1987
    Date of Patent: April 19, 1988
    Assignee: Tenneco Canada Inc. (ERCO division)
    Inventors: Alexander McLean, Iain D. Sommerville, Paul S. Timmons, Michael S. Krugel
  • Process for the oxidative delignification of demethylated chemical pulp
    Patent number: 4729817
    Abstract: The extent of delignification of chemical pulps by oxygen-containing chemicals, preferably hydrogen peroxide, is enhanced by demethylating the pulp prior to such oxidative delignification, to a degree of demethylation of at least about 30%, preferably at least about 50%. Demethylation may be achieved by chemical treatment of the already-formed pulp or by modification to the pulping process to result in demethylated pulp.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: March 8, 1988
    Assignee: Tenneco Canada Inc. (ERCO division)
    Inventors: Raymond C. Francis, Douglas W. Reeve
  • Electrochemical removal of chromium from chlorate solutions
    Patent number: 4699701
    Abstract: Dichromate values, or other soluble hexavalent chromium values, are removed from cell liquor or other aqueous media containing the same by cathodically reducing the same to trivalent chromium, which deposits on the cathode as chromium hydroxide. The cathode has a high surface area three-dimensional structure which exposes the electrolyte to electrolysis for a relatively long period of time. An electrode potential of about 0 volts vs. SCE is applied to the cathode.
    Type: Grant
    Filed: October 29, 1986
    Date of Patent: October 13, 1987
    Assignee: Tenneco Canada Inc. (ERCO division)
    Inventor: Marek Lipsztajn
  • Removal of arsenic from acids
    Patent number: 4692228
    Abstract: Dissolved arsenic (III) contaminant is removed from mineral acids, such as hydrochloric acid, by electrolysis using a high surface area cathode having a three-dimensional electrolyte-contacting surface which exposes the electrolyte to electrolysis for a relatively long period of time. The dissolved arsenic is reduced to arsenic metal, which then plates out on the cathode. Dissolved concentrations of arsenic of less than 1 ppm can be achieved using the invention.
    Type: Grant
    Filed: May 21, 1986
    Date of Patent: September 8, 1987
    Assignee: Tenneco Canada Inc. (ERCO division)
    Inventor: Zbigniew Twardowski
  • Membrane pervaporation process
    Patent number: 4683039
    Abstract: Chlorine dioxide is transferred by membrane pervaporation from one chamber filled with aqueous chlorine dioxide-generating reactants or other chlorine dioxide donor medium across a gas-permeable hydrophobic membrane to a recipient aqueous medium filling a second chamber. The recipient medium may be water, pulp suspension or sodium chlorite solution. The membrane typically is expanded polytetrafluoroethylene.
    Type: Grant
    Filed: December 24, 1985
    Date of Patent: July 28, 1987
    Assignee: Tenneco Canada Inc. (ERCO division)
    Inventors: Zbigniew Twardowski, James D. McGilvery