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Effect of Weak Alkaline Hydrogen Peroxide Bleaching on Carbohydrates and Lignin in Poplar CTMP
Received:September 18, 2023  
DOI：10.11980/j.issn.0254-508X.2023.11.008
Key Words:poplar CTMP  H2O2 bleaching  MgO  carbohydrates  lignin  pulp properties
Fund Project:国家自然科学基金项目（22178273）。
Author NameAffiliationPostcode
ZHANG Xinyue* Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
ZHANG Shuhui Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
LI Jing Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
TIAN Jianan Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
LIU Zhaojun Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
HOU Qingxi Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
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Abstract:In this study， the effects of MgO substitution ratio for NaOH and bleaching time on the carbohydrates and lignin content and properties of poplar CTMP were investigated. The results showed that the carbohydrates and lignin in poplar CTMP would be dissolved quickly in the early stage of bleaching， and slowly in the later stage of bleaching. With the substitution ratio of NaOH with MgO increased， the bleaching yield of the poplar CTMP and the content of carbohydrates and lignin in the bleached pulp increased significantly. Compared to the control sample （NaOH as the alkali source）， when the MgO substitution ratio for NaOH was 75%， and bleaching time was 90 min， respectively， the contents of holocellulose and lignin in the bleached pulp reached 67.60% and 23.09%， respectively. Moreover， the bulk reached 2.21 cm3/g from 2.09 cm3/g with an increase of 5.74%， and the brightness decreased slightly. Meanwhile， the tensile index and tear index were 40.6 N·m/g and 3.47 mN·m2/g with a decrease of 14.16% and 14.32%， respectively.
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