High-purity cellulose production from birch wood by γ-valerolactone/water fractionation and IONCELL-P process

Shokoufeh Shokri, Sahab Hedjazi*, Huy Quang Lê, Ali Abdulkhani, Herbert Sixta

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
82 Downloads (Pure)

Abstract

This study presents an environmentally friendly process to produce high-purity cellulose (dissolving pulp) from birch wood by combining γ-valerolactone (GVL)/water fractionation and ionic liquid treatment of pulp, IONCELL-P (IP). A paper grade pulp was produced from optimal GVL cook with a similar composition to birch kraft pulp and was bleached with ECF sequence before the hemicelluloses were removed using the IONCELL-P process. The purity of the GVL-IP pulp significantly exceeded that of commercial prehydrolysis kraft (PHK) and prehydrolysis soda-anthraquinone (PH-Soda-AQ) pulps. IONCELL-P extraction removed more than 90% of the hemicelluloses, resulting in a dissolving pulp with a purity of 96% and a high molecular mass fraction, 2.3 times higher than that of a conventional PHK pulp. GVL-IP pulps are suitable not only for regenerated cellulose fibers or films, but also for high-purity, high-viscosity cellulose acetate and ethers, which cannot be produced in an environmentally friendly way by conventional processes.

Original languageEnglish
Article number119364
Number of pages8
JournalCarbohydrate Polymers
Volume288
Early online date22 Mar 2022
DOIs
Publication statusPublished - 15 Jul 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Cellulose
  • Dissolving pulp
  • GVL
  • Organosolv process

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