title: Lignin removal enhancement from prehydrolysis liquor of kraft-based dissolving pulp production by laccase-induced polymerization.
abstract: 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.
authors.affiliation: Key Laboratory of Pulp & Paper Science and Technology (Qilu University of Technology), Ministry of Education, Jinan, Shandong 250353, PR China; Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada. Electronic address: wangqiang8303@163.com.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada; Pulp and Paper Research Division, BCSIR Laboratories, Dhaka, Dr. Qudrat-i-Khuda Road, Dhaka 1205, Bangladesh.
authors.forename: M Sarwar
authors.initials: MS
authors.lastname: Jahan
authors.affiliation: Key Laboratory of Pulp & Paper Science and Technology (Qilu University of Technology), Ministry of Education, Jinan, Shandong 250353, PR China; Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Liu
authors.affiliation: Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada; College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China.
authors.forename: Qingxian
authors.initials: Q
authors.lastname: Miao
authors.affiliation: Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
authors.forename: Yonghao
authors.initials: Y
authors.lastname: Ni
mesh_terms: D000498:Allyl Compounds / Q000494:pharmacology; D001709:Biotechnology / Q000379:methods*; D005374:Filtration; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis / Q000187:drug effects; D042845:Laccase / Q000378:metabolism*; D008031:Lignin / Q000302:isolation & purification*; D008970:Molecular Weight; D010209:Paper; D058105:Polymerization / Q000187:drug effects; D000644:Quaternary Ammonium Compounds / Q000494:pharmacology; D012995:Solubility; D013696:Temperature; D055454:Trametes / Q000201:enzymology
chemical_list: D000498:Allyl Compounds; D000644:Quaternary Ammonium Compounds; C508190:diallyldimethylammonium chloride; D008031:Lignin; D042845:Laccase
keywords: Flocculation; Laccase; Lignin removal; Polymerization; Prehydrolysis liquor