Fibre porosity development of dissolving pulp during mechanical and enzymatic processing

S. Grönqvist (Corresponding Author), T.K. Hakala, T. Kamppuri, M. Vehviläinen, T. Hänninen, T. Liitä, T. Maloney, A. Suurnäkki

Research output: Contribution to journalArticleScientificpeer-review

37 Citations (Scopus)

Abstract

Dissolving grade pulps are used as raw material for manufacture of regenerated cellulose fibres and their use is constantly growing. Despite intensive research, there is still a need to develop cellulose dissolution-regeneration processes that would be economically viable, fulfil the pre-conditions of sustainability and would be able to meet the strict product quality requirements. The basis for creation of such a process is in deep understanding of the biomass structure and factors affecting the cellulose modification and dissolution. In this paper, the effects of the mechanical and enzymatic pre-treatments on the pore structure and alkaline solubility of dissolving grade pulp are discussed. Formation of micro- and macropores in the pulp fibres during mechanical shredding was found to correlate with the susceptibility of the fibres to enzymatic hydrolysis. The fibre porosity development during the processing was studied by a modified solute exclusion approach, which revealed differences between the effect of mild enzyme or acid hydrolysis on the pore structure of fibres. The dissolution of the modified fibres in NaOH/ZnO was evaluated and found to correlate with overall pore volume and accessible surface area analysed by the modified solute exclusion method.
Original languageEnglish
Pages (from-to)3667-3676
JournalCellulose
Volume21
Issue number5
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Keywords

  • cellulose dissolution
  • dissolving pulp
  • enzymatic hydrolysis
  • porosity
  • solute exclusion

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