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    Author(s): R.H. Atalla; I.A. Weinstock; R.S. Reiner; E.L. Springer; C.G. Hill
    Date: 2003
    Source: 2003 TAPPI Fall Technical Conference: Engineering, Pulping & PCE&I. Atlanta, GA: TAPPI Press, c2003: [5] pages
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (110 KB)

    Description

    We have reported the use of polyoxometalates (POMs) as selective, regenerable delignification agents that are inherently thermodynamically stable, and self-buffering. The re-activation with oxygen is under conditions that mineralize the organic byproducts of the delignification process. Thus, the POMs provide the basis for a closed bleach plant wherein the consumable oxidant is oxygen and the primary byproducts are carbon dioxide and water. They have been shown to reduce the kappa levels of softwood kraft pulps from 30 to below 5 while retaining viscosity above 20. Recently we have concentrated on POMs that are more efficient in the uptake of electrons from the substrate pulps per mole of POM. We have also studied the determinants of rates of electron transfer from the substrates to the POMs. All of these must be optimized in order to achieve the full economic potential of POM based delignification. This report will summarize progress along the multiple fronts that we are investigating including the possibilities of using POMs as a complement to high yield pulping and electrochemical bleaching using POMs as mediators.

    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

    Atalla, R.H.; Weinstock, I.A.; Reiner, R.S.; Springer, E.L.; Hill, C.G. 2003. Progress in the development and optimization of polyoxometalate delignification systems. 2003 TAPPI Fall Technical Conference: Engineering, Pulping & PCE&I. Atlanta, GA: TAPPI Press, c2003: [5] pages

    Keywords

    Polyoxymetalates, POMs, delignification

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