Dissolving pulps from enzyme treated kraft pulps for viscose application

V. Gehmayr, H. Sixta

    Research output: Contribution to journalArticleScientific

    Abstract

    The purpose of this study was to
    illuminate enzymatic treatments as
    process steps for the efficient conversion
    of paper-grade pulps to dissolving pulps
    in terms of process economics. The
    challenge of pulp refinement comprises
    the selective removal of hemicelluloses
    and the precise adjustment of the pulp
    viscosity, while maintaining the
    reactivity of the pulp as required for
    viscose application.
    A commercial oxygen-delignified
    E. globulus paper-grade kraft pulp was
    subjected to xylanase (X) pre-treatment
    combined with cold caustic extraction
    (CCE) at reduced alkali concentration
    and to endoglucanase (EG) posttreatment
    after TCF-bleaching. The
    xylanase pre-treated pulp showed
    increased reactivity towards xanthation
    and high viscose dope quality in terms
    of particle content in comparison to the
    pulp after cold caustic extraction at
    elevated alkali concentration.
    The dependence of cellulose chain
    scission upon endoglucanase treatment
    on certain pulp qualities was analyzed
    in detail, and this allowed precise
    viscosity reduction as well as reactivity
    increase. The qualities of the spun fibers
    from the differently treated pulps were
    very similar to those viscose fibers from
    commercial dissolving pulps.
    Original languageEnglish
    Pages (from-to)152-160
    JournalLenzinger Berichte
    Volume89
    Publication statusPublished - 2011
    MoE publication typeB1 Article in a scientific magazine

    Keywords

    • Dissolving pulp
    • endoglucanase
    • enzyme
    • filterability
    • reactivity
    • viscose fiber
    • xylanase

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