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  1. Closed-mill delignification by design using polyoxometalates

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    Author(s): C. J. Houtman; R. S. Reiner; S. E. Reichel; M. J. Birchmeier; C. E. Sullivan; L. A. Weinstock; R. H. Atalla
    Date: 1999
    Source: 1999 proceedings : TAPPI International Environmental Conference, April 18-21, 1999, Nashville, Tennessee, Opryland Hotel. Atlanta, GA : Tappi Press, c1999.:p. 819-829 : ill.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (248 KB)

    Description

    Polyoxometalates (POMs) are a class of delignification agents that promise to provide the basis for a new closed-mill bleaching technology. The results presented here are based on the use of Na6SiV2W10O40, which is effective in reducing the Kappa number of softwood Kraft pulp from 30 to below 10 with minimal loss in viscosity. A critical part of a viable POM process is the elimination of the organic lignin and carbohydrate-derived fragments dissolved during the delignification. To simulate a closed process, a series of pulp samples were delignified with the same POM liquor. Before each pulp sample was treated, the liquor was oxidized to regenerate the POM and remove a large portion of the organic material dissolved during the previous delignification step. By collecting and reusing the wash water during this set of experiments, we showed that a steady-state carbon load will be achieved and that the proposed industrial process is feasible. The rate of the wet oxidation of organic material was similar to the rate observed for acetate oxidation.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Houtman, C. J.; Reiner, R. S.; Reichel, S. E.; Birchmeier, M. J.; Sullivan, C. E.; Weinstock, L. A.; Atalla, R. H. 1999. Closed-mill delignification by design using polyoxometalates. 1999 proceedings : TAPPI International Environmental Conference, April 18-21, 1999, Nashville, Tennessee, Opryland Hotel. Atlanta, GA : Tappi Press, c1999.:p. 819-829 : ill.

    Keywords

    Softwoods, Sulfate pulping, Bleaching, Delignification, Viscosity, Polyoxometalates, Liquors, Kappa number

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