Conversion of bleached soda bagasse paper-grade pulp to dissolving-grade pulp using different hemicelluloses removing post-treatments with emphasis on IONCELL-P process

Kajal Moradian Gilan, Sahab Hedjazi*, Huy Quang Lê, Ali Abdolkhani, Sara Ceccherini, Mira Viljanen, Herbert Sixta

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
38 Downloads (Pure)

Abstract

Paper-grade pulp, rich in hemicellulose content, is a cheap source for producing dissolving pulps. The main challenge in the conversion of a cheap paper-grade pulp to a higher-valued dissolving pulp is the selective removal of hemicelluloses, while maintaining the pulp reactivity. This paper presents a comparison of different hemicellulose extraction methods such as cold caustic extraction, IONCELL-P(ulp) and xylanase treatment on converting fully bleached soda bagasse paper-grade pulp to dissolving pulp. IONCELL-P(ulp) treatment, using an optimized1-ethyl-3-methylimidazolium acetate/water as the extraction medium, yielded 85% xylan removal, which is comparable to the cold caustic extraction or a combination of xylanase treatment and cold caustic extraction. A complete separation of the two polymers by IONCELL-P(ulp) is not possible due to the overlap of the molecular masses of the cellulose and xylan molecules, an inherent characteristic of sugarcane bagasse pulp. All the investigated methods effectively removed xylan, with differences in the selectivity and the reactivity of the remaining pulp.

Original languageEnglish
Pages (from-to)473-483
Number of pages11
JournalHolzforschung
Volume76
Issue number5
Early online date17 Feb 2022
DOIs
Publication statusPublished - 25 May 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • bagasse soda pulp
  • cold caustic extraction
  • dissolving pulp
  • IONCELL-P(ulp)
  • xylanase

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