Patents by Inventor El-Sayed A. Abdel-Aal

El-Sayed A. Abdel-Aal 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).

  • Treatment of spent pulping liquor with lignin separation to recover alkali pulping chemicals in manufacture of paper pulp
    Patent number: 6830696
    Abstract: A method of treating spent alkaline pulping liquor (black liquor) includes the steps of providing black liquor containing lignin, and acidulating a phosphate containing material, wherein phosphoric acid is generated by the acidulating step. The black liquor is mixed with phosphoric acid from the acidulated phosphate containing material, wherein lignin is separated and clarified liquor results. The method can include the step of adding a water soluble, surface active, polymeric, coagulant agent to the black liquor before mixing with the phosphoric acid from the phosphate containing material. The clarified liquor comprises anion species including phosphate.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: December 14, 2004
    Assignee: University of Florida Research Foundation, Inc.
    Inventors: Hassan E. El-Shall, El-Sayed A. Abdel-Aal