title: Hemicelluloses removal in autohydrolysis pretreatment enhances the subsequent alkali impregnation effectiveness of poplar sapwood.
abstract: This work is aimed at investigating the influence of changes in the content of hemicelluloses of the autohydrolyzed poplar sapwood on the subsequent alkali impregnation for chemi-mechanical pulping (CMP). An alkali impregnation process was conducted using the autohydrolyzed poplar sapwood with different content of hemicelluloses as raw materials. The results showed that both the amount of NaOH consumption and swelling degree of poplar sapwood increased with the removal of hemicelluloses, thus enhancing the alkali impregnation effectiveness. The hemicelluloses removal can also shorten the alkali impregnation time for the autohydrolyzed poplar sapwood to achieve the similar impregnation effectiveness of unautohydrolyzed poplar sapwood. All of these can be attributed to the fact that the hemicelluloses removal would result in the exposure of more free hydroxyl groups on the cellulose and an increase in the porosity of the fiber cell walls.
authors.affiliation: Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, PR China.
authors.forename: Xiaoya
authors.initials: X
authors.lastname: Jiang
authors.affiliation: Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, PR China. Electronic address: qingxihou@tust.edu.cn.
authors.forename: Qingxi
authors.initials: Q
authors.lastname: Hou
authors.affiliation: Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, PR China.
authors.forename: Honglei
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, PR China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Qin
mesh_terms: D001709:Biotechnology / Q000379:methods*; D002473:Cell Wall / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry; D006868:Hydrolysis; D011134:Polysaccharides / Q000737:chemistry / Q000302:isolation & purification*; D032107:Populus / Q000737:chemistry* / Q000166:cytology; D012972:Sodium Hydroxide / Q000737:chemistry*; D014934:Wood / Q000737:chemistry
chemical_list: D011134:Polysaccharides; D012972:Sodium Hydroxide; C007916:hemicellulose; D002482:Cellulose
keywords: Alkali impregnation; Autohydrolysis; Hemicelluloses; Poplar sapwood; Wood swelling