期刊
BIORESOURCE TECHNOLOGY
卷 164, 期 -, 页码 380-385出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.05.005
关键词
Prehydrolysis liquor; Lignin removal; Laccase; Polymerization; Flocculation
资金
- NSERC CRD grant, an Atlantic Innovation Fund, Canada Research Chairs programs of the Government of Canada
- National Science Foundation of China [31270627, 31370580]
- Natural Science Foundation of Shandong Province [ZR2010CM065, ZR2011CM011]
Lignin removal is essential for value-added utilization of hemicelluloses and acetic acid present in the prehydrolysis liquor (PHL) of a kraft-based hardwood dissolving pulp production. In this paper, a novel process concept, consisting of laccase-induced lignin polymerization, followed by filtration/flocculation, was developed to enhance the lignin removal. The results showed that the lignin removal increased from 11% to 46-61% at laccase concentration of 1-4 U mL (1). The GPC results showed that the molecular weight of the lignin from the laccase treated PHL was increased by 160% in comparison with the original one. The subsequent flocculation using singular Poly-DADMAC system or dual polymer system of Poly-DADMAC/CPAM can further remove 10-15% lignin. The concentrations of hemicelluloses and acetic acid were negligibly affected during the laccase treatment, while flocculation caused 12-15% of total sugar loss. Additionally, the process incorporates this new concept into the kraft-based dissolving pulp production process was proposed. (C) 2014 Elsevier Ltd. All rights reserved.
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