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Upgrading Paper-Grade Bleached Hardwood Pulp Towards Dissolving Pulp Using γ-Valerolactone

Authors :
Shanshan Liu
Yu Liu
Yingchao Wang
Yuanyuan Wang
Qiang Wang
Huili He
Source :
BioResources, Vol 19, Iss 3, Pp 5096-5108 (2024)
Publication Year :
2024
Publisher :
North Carolina State University, 2024.

Abstract

γ-Valerolactone (GVL) is a promising biomass-based platform compound that can be used for the removal of hemicellulose in pulp. In this study, a paper-grade pulp was treated using GVL to generate dissolving pulp for viscose production. The GVL concentration, treatment temperature, and reaction time had significant effect on the hemicellulose dissolution. The dissolving pulp with α-cellulose content of 92.3% and hemicellulose content of 5.45% was achieved with 60% GVL at 120 °C for 2 h. The Fock reactivity and intrinsic viscosity of the obtained dissolving pulp were 54.6% and 595 mL/g, which is comparable with the commercial product. In addition, GVL spent liquor was also recycled and reused to upgrade paper-grade pulp. By using purified recycled GVL to treat original pulp, the Fock reactivity of pulp was improved, and the cellulose content of as-prepared upgraded pulp increased to 92.1%, which was close to the cellulose content of dissolving pulp obtained from fresh GVL solution, while the intrinsic viscosity decreased significantly to 598 mL/g. Therefore, the efficient reuse of GVL not only ensured the high quality of dissolving pulp, but it also saved production costs and reduced environmental pollution.

Details

Language :
English
ISSN :
19302126
Volume :
19
Issue :
3
Database :
Directory of Open Access Journals
Journal :
BioResources
Publication Type :
Academic Journal
Accession number :
edsdoj.2f503d5b713d46629b1eff25a541e21a
Document Type :
article