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.
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.
Bioresour Technol. 2014 Jul;164:380-5. doi: 10.1016/j.biortech.2014.05.005. Epub 2014 May 10.
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.
木质素的去除对于增值利用半纤维素和存在于硫酸盐阔叶木溶解浆生产预水解液（PHL）中的乙酸是至关重要的。本文提出了一种新的工艺概念，包括漆酶诱导木质素聚合，然后进行过滤/絮凝，以提高木质素的去除率。结果表明，漆酶浓度为 1-4 U mL(-1)时，木质素去除率从 11%提高到 46-61%。GPC 结果表明，与原始木质素相比，漆酶处理后的 PHL 中的木质素分子量增加了 160%。随后使用单一的聚二烯丙基二甲基氯化铵（Poly-DADMAC）系统或聚二烯丙基二甲基氯化铵/阳离子聚丙烯酰胺（CPAM）的双聚合物系统进行絮凝，可以进一步去除 10-15%的木质素。漆酶处理过程对半纤维素和乙酸的浓度几乎没有影响，而絮凝过程会导致 12-15%的总糖损失。此外，还提出了将这一新概念纳入硫酸盐溶解浆生产工艺的方案。
