Filtrate analysis as tool to follow peroxide bleaching performance

Tarja Tamminen, Marjatta Ranua, Benoit Dufour, Raimo Kokkonen, Seppo Kauliomäki

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Industrial oxygen-delignified birch kraft pulp was bleached with alkaline hydrogen peroxide (P stage) after acid (A stage) or chelation (Q stage) pretreatments to remove detrimental metal residues. Pulp brightness correlated clearly with the manganese (Mn) content of the incoming pulp irrespective of the method used for the metal removal. Pulp viscosity after peroxide stage was not significantly affected by the Mn content, whereas the preceding A stage was detrimental to it. Some typical lignin degradation products, together with 2-furan carboxylic acid, were abundant in the peroxide stage filtrates after incomplete pretreatment. 2-furan carboxylic acid is easy to detect due to its UV activity, thus providing a potent marker compound for peroxide stage performance. Part of the 2-furan carboxylic acid in the P stage was explained as direct carry-over from the preceeding A and Q stages, but its content increased in the P stage possibly due to further reactions of some transient species remaining in the pulp after the pretreatment.
    Original languageEnglish
    Pages (from-to)82-91
    JournalO Papel
    Volume68
    Issue number2
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Brightness
    • capillary electrophoresis
    • chelation
    • hydrogen peroxide
    • metal

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