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Study on Bleaching Process of Pre-hydrolyzed Bamboo Sulfate Pulp
Received:June 12, 2024  
DOI：10.11980/j.issn.0254-508X.2024.07.004
Key Words:bamboo pulp  oxygen delignification  ClO2 bleaching  Eop bleaching
Fund Project:国家重点研发计划（2023YFD2201903）；福建省引导性项目（2023H0008）。
Author NameAffiliationPostcode
NIU Shengyue College of Materials Engineering， National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350108 350108
LUO Xiyao College of Materials Engineering， National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350108 350108
LIN Kairui College of Materials Engineering， National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350108 350108
YANG Jiawei College of Materials Engineering， National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350108 350108
GAO Yafeng College of Materials Engineering， National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350108 350108
HU Huichao College of Materials Engineering， National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350108 350108
LI Jianguo College of Materials Engineering， National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350108 350108
CHEN Lihui* College of Materials Engineering， National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350108 350108
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Abstract:Using pre-hydrolyzed sulfate unbleached bamboo pulp as raw material， the dissolved bamboo pulp was prepared by the bleaching process of “oxygen delignification （O）-first stage chlorine bleaching （D0）-oxygen and hydrogen peroxide enhanced alkali extraction （Eop）-second stage chlorine bleaching （D1）”. The treatment conditions of each section were optimized （O bleaching stage： sodium hydroxide dosage of 2.0%， oxygen pressure of 0.5 MPa， reaction time of 60 min， reaction temperature of 95 ℃； D0 bleaching stage： chlorine dioxide dosage of 3.5%， reaction time of 80 min， reaction temperature of 70 ℃， the initial pH value of 4.0； Eop bleaching stage： hydrogen peroxide dosage of 1.4%， oxygen pressure of 0.2 MPa， reaction time of 90 min， reaction temperature of 90 ℃， initial pH value of 11.5； D1 bleaching stage： chlorine dioxide dosage of 1.5%， the reaction time of 150 min， the reaction temperature of 70 ℃， the initial pH value of 4.0）， and the final prepared bamboo pulp whiteness reached 82.7%， with viscosity of 440 mL/g， ash content of 0.24%， α-cellulose content of 90.92%.
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