High consistency mechano-enzymatic pretreatment for kraft fibres: effect of treatment consistency on fibre properties

Jenni Rahikainen*, Outi Mattila, Thaddeus Maloney, Ville Lovikka, Kristiina Kruus, Anna Suurnäkki, Stina Grönqvist

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Fibre reactivity is essential for cellulose dissolution and derivatisation and a porous fibre structure is one key determinant for a highly reactive pulp. Mechanical and enzymatic treatments are known to improve fibre reactivity and more recently, the combination of mechano-enzymatic treatment has been shown to synergistically enhance the beneficial effect. The aim of this work was to do a systematic study on the effect of dry matter content during enzymatic modification of fibres and define the conditions that optimally improve fibre porosity. The combined mechano-enzymatic treatments at 15–25 w% consistency had the most pronounced effect on fibre porosity and morphology analysed by solute exclusion technique, nitrogen sorption and scanning electron microscopy. Light microscopy imaging confirmed that the combined mechano-enzymatic treatment at high consistency (> 10 w%) resulted in extensive fibrillation of the treated fibres which was not observed after sole mechanical or enzymatic treatments.

Original languageEnglish
Pages (from-to)5311–5322
JournalCellulose
Volume27
DOIs
Publication statusPublished - 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Endoglucanase
  • Enzyme
  • Fibre modification
  • Fibre reactivity
  • High consistency
  • Porosity

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    CERES: Competence Center for the materials Bioeconomy: A Flagship for our Sustainable Future

    Mäkelä, K.

    01/05/201831/12/2022

    Project: Academy of Finland: Other research funding

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