Journal
BIORESOURCE TECHNOLOGY
Volume 192, Issue -, Pages 11-16Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.04.107
Keywords
Hemicelluloses removal; Fiber fractionation; Fiber morphology; Caustic extraction; Dissolving pulp
Funding
- National Natural Science Foundation of China [31370577]
- Canada Research Chairs program of the Government of Canada
- NSERC CRD program of the Government of Canada
- Tianjin Municipal Science and Technology Commission [12ZCZDGX01100]
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Hemicelluloses removal is highly desirable in many biomass processes, including the pretreatment steps of the bioconversion for ethanol production, production of high-quality dissolving pulps. In this study, a sequential treatment consisting of pulp fractionation, followed by caustic treatment to remove hemicelluloses from a softwood sulfite pulp, was investigated. The long-fiber fraction obtained after pulp fractionation, had a lower hemicelluloses content and smaller specific surface area, but larger pore diameter than the short-fiber fraction. The fiber fractions were subsequently treated in a cold caustic extraction (CCE) or hot caustic extraction (HCE). Results showed that hemicelluloses removal in the long-fiber fraction was more pronounced than the short-fiber fraction in both CCE and HCE processes. Other parameters, such as hemicelluloses removal selectivity, yield were studied. The underlying explanations were given. (C) 2015 Elsevier Ltd. All rights reserved.
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