Patents by Inventor Atef Shaban

Atef Shaban 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 of pulping and bleaching fibrous plant material with tert-butyl alcohol and tert-butyl peroxide
    Patent number: 5252183
    Abstract: A process for producing bleached pulp from a fibrous plant material (e.g., wood), wherein the material is contacted with an alcohol solvent in a pulping zone to extract lignin from the fibrous plant material. The resulting pulp is then treated with a hydroperoxide or peroxide bleaching agent in a bleaching zone to form bleached pulp. Alcohol formed from the hydroperoxide or peroxide during the bleaching process may be recycled to the pulping zone. A preferred alcohol is tert-butyl alcohol, while a preferred hydroperoxide is tert-butyl hydroperoxide.
    Type: Grant
    Filed: September 13, 1991
    Date of Patent: October 12, 1993
    Assignee: ABB Lummus Crest Inc.
    Inventors: Atef Shaban, George D. Suciu