Characterization of uronic acids during kraft and Superbatch pulping

J Buchert*, J Laine, N Tenkanen, T Vuorinen, L Viikari

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

    Abstract

    The uronic acids profiles during conventional and Superbatch cooking were analyzed by total enzymatic hydrolysis. In the conventional pulp hexenuronic acid (HexA) was found to be the major uronic acid component and about 83% of the uronic acids were hexenuronic acids. During conventional and Superbatch cooking, part of the initial 4-O-methylglucuronic acids (MeGlcA) remained unreacted and also a small amount of the intermediate product, 4-O-methyliduronic acid (MeIdoA) was detected in both pulps. Due to the different alkaline profile during the Superbatch cooking the hexenuronic acids formed in the initial phase of the cook were almost completely degraded and as a result the Superbatch pulp contained significantly lower amounts of uronic acids than the conventional pulp at the same kappa number level.

    Original languageEnglish
    Title of host publicationISWPC - 9TH INTERNATIONAL SYMPOSIUM ON WOOD AND PULPING CHEMISTRY - ORAL PRESENTATIONS
    PagesM31-M33
    Number of pages3
    Publication statusPublished - 1997
    MoE publication typeA4 Article in a conference publication
    EventInternational Symposium on Wood and Pulping Chemistry - Montreal, Canada
    Duration: 9 Jun 199712 Jun 1997
    Conference number: 9

    Conference

    ConferenceInternational Symposium on Wood and Pulping Chemistry
    Abbreviated titleISWPC
    CountryCanada
    CityMontreal
    Period09/06/199712/06/1997

    Keywords

    • hexenuronic acid
    • kraft pulping
    • uronic acid

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