Patents by Inventor Kazushige Tanae

Kazushige Tanae 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).

  • Method for concentrating black liquor with oxidizing followed by CO.sub.2 addition
    Patent number: 4911787
    Abstract: A method and apparatus are disclosed for concentrating an alkaline waste liquor containing sulfur compounds, the so-called black liquor, which is discharged from a step of Kraft-cooking wood fibers, in order to recover the cooking chemicals from said waste liquor, characterized in that CO.sub.2 gas and/or a gas containing CO.sub.2 gas is added to said waste liquor as a boiling-point-lowering agent, viscosity-lowering agent and solidification promoter, after a step of oxidizing said waste liquor and in or prior to one or more stages during the step of concentrating said waste liquor. Also disclosed is an apparatus for concentrating an alkaline waste liquor containing substantially no sulfur compounds (i.e.
    Type: Grant
    Filed: September 21, 1987
    Date of Patent: March 27, 1990
    Assignee: Research Association of Pulp and Paper Technology
    Inventors: Akira Shimokura, Keiji Hasegawa, Shuichi Nagato, Kazushige Tanae, Tokiya Yaguchi