Journal
BIORESOURCE TECHNOLOGY
Volume 192, Issue -, Pages 501-506Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.06.011
Keywords
Mechanical refining; Fiber morphology; Hemicelluloses removal; Cold caustic extraction; Dissolving pulp
Funding
- National Natural Science Foundation of China [31370577]
- Canada Research Chairs
- NSERC CRD programs of the Government of Canada
- Tianjin Municipal Science and Technology Commission [12ZCZDGX01100]
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Hemicelluloses removal is a prerequisite for the production of high-quality cellulose (also known as dissolving pulp), and further recovery and utilization of hemicelluloses, which can be considered as a typical Integrated Forest Biorefinery concept. In this paper, a process of combined mechanical refining and cold caustic extraction (CCE), which was applied to a softwood sulfite sample, was investigated. The results showed that the hemicelluloses removal efficiency and selectivity were higher for the combined treatment than that for the CCE alone. The combined treatment can thus decrease the alkali concentration (from 8% to 4%) to achieve a similar hemicelluloses removal. The improved results were due to the fact that the mechanical refining resulted in increases in pore volume and diameter, water retention value (WRV) and specific surface area (SSA), all of which can make positive contributions to the hemicelluloses removal in the subsequent CCE process. (C) 2015 Elsevier Ltd. All rights reserved.
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