College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada; Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education/Shandong Province, Qilu University of Technology, Jinan 250353, China.
College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
Bioresour Technol. 2017 Jun;234:61-66. doi: 10.1016/j.biortech.2017.03.026. Epub 2017 Mar 7.
The effective separation of hemicelluloses and cellulose is desirable for the production of high-purity cellulose, which is a sustainable raw material for many value-added applications. For this purpose, the kinetics and mechanism of hemicelluloses removal from the cold caustic extraction (CCE) were investigated in the present study. The hemicelluloses removal process consists of: 1) the bulk phase, characteristic of significant hemicelluloses removal; 2) the transition phase, hemicelluloses transferring from the inner to the outer region of the fiber wall, with negligible overall hemicelluloses removal; 3) the residual phase, presenting a weak but continuing hemicelluloses removal. Furthermore, the enzymatic peeling method was adopted to study the fundamentals of hemicelluloses removal. The results showed that the molecular weight of hemicelluloses is the main parameter governing their diffusion/dissolution processes, and that the low molecular weight hemicelluloses are preferentially removed.
有效分离半纤维素和纤维素对于生产高纯度纤维素是可取的，纤维素是许多增值应用的可持续原料。为此，本研究考察了从冷碱抽提（CCE）中去除半纤维素的动力学和机制。半纤维素去除过程包括：1）主体相，具有显著的半纤维素去除特征；2）过渡相，半纤维素从纤维壁的内部向外部区域转移，整体半纤维素去除可忽略不计；3）残留相，呈现出较弱但持续的半纤维素去除。此外，采用酶剥皮法研究了去除半纤维素的基本原理。结果表明，半纤维素的分子量是控制其扩散/溶解过程的主要参数，低分子量半纤维素优先去除。
