Organochlorine Formation in Tertiary Amine Catalyzed Pulp Bleaching

Naveen Kumar Chenna*, Pablo Piovano, Christian Järnefelt, Tapani Vuorinen

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)

    Abstract

    An oxygen delignified eucalyptus kraft pulp was bleached by applying a catalytic amount of a tertiary amine, 1,4-diazabicyclo[2,2,2]octane, and hypochlorous acid at varying pH, temperature, and time. The bleaching filtrate was analyzed for chloroform and AOX and the pulp for residual lignin, hexenuronic acid, and OX. In comparison with chlorine dioxide bleaching, the novel catalytic bleaching (pH < 6) generated only traces of chloroform and low contents of AOX and OX. Separate catalytic oxidations of authentic hexenuronic acid showed that it was a major precursor of chloroform. The results demonstrate a practical way to reduce organochlorine formation in pulp bleaching and provide new understanding on the reaction pathways that yield chloroform.

    Original languageEnglish
    Pages (from-to)318-328
    Number of pages11
    JournalJournal of Wood Chemistry and Technology
    Volume36
    Issue number5
    DOIs
    Publication statusPublished - 2 Sep 2016
    MoE publication typeA1 Journal article-refereed

    Keywords

    • AOX
    • chloroform
    • hypochlorous acid
    • OX
    • pulp bleaching
    • tertiary amine

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