竹材机械浆顽固发色基团结构解析及其脱除机理初探

焦健; 朱北平; 韩善明; 梁芳敏; 苏晨; 房桂干; 谢章红; 沈葵忠

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Study on the Structural Characteristics and Removal Mechanism of the Inactive Chromophores of Neosinocalamus Affinis Mechanical Pulp

Received:August 15, 2023

DOI：10.11981/j.issn.1000-6842.2023.04.01

Key Words:Neosinocalamus Affinis mechanical pulp;bleach;stubborn chromophores;removal mechanism

Fund Project:国家自然科学基金面上项目“竹材机械浆中顽固发色基团的结构特点及其脱除机理研究”（32271974）；国家自然科学基金重大项目课题“木材纤维精准解离与界面调控机制”（31890771）；江苏省生物质能源与材料重点实验室重点项目“有机溶剂/碱性过氧化氢双相体系分离木质素”（JSBEM-S-202309）；宜宾市揭榜挂帅科技项目资助（2022JB009）；泰山产业领军人才工程专项经费资助（tscy20200213）。

Author Name	Affiliation	Postcode
JIAO Jian	Institute of Chemical Industry of Forestry Products， CAF； Key Lab of Biomass Energy and Material， Jiangsu Province； Co-Innovation Center of Efficient Processing and Utilization of Forest Resources， Jiangsu Province； Key Lab of Chemical Engineering of Forest Products， National Forestry and Grassland Administration； National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass， Nanjing， Jiangsu Province， 210042	210042
ZHU Beiping	Institute of Chemical Industry of Forestry Products， CAF； Key Lab of Biomass Energy and Material， Jiangsu Province； Co-Innovation Center of Efficient Processing and Utilization of Forest Resources， Jiangsu Province； Key Lab of Chemical Engineering of Forest Products， National Forestry and Grassland Administration； National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass， Nanjing， Jiangsu Province， 210042	210042
HAN Shanming	Institute of Chemical Industry of Forestry Products， CAF； Key Lab of Biomass Energy and Material， Jiangsu Province； Co-Innovation Center of Efficient Processing and Utilization of Forest Resources， Jiangsu Province； Key Lab of Chemical Engineering of Forest Products， National Forestry and Grassland Administration； National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass， Nanjing， Jiangsu Province， 210042	210042
LIANG Fangmin	Institute of Chemical Industry of Forestry Products， CAF； Key Lab of Biomass Energy and Material， Jiangsu Province； Co-Innovation Center of Efficient Processing and Utilization of Forest Resources， Jiangsu Province； Key Lab of Chemical Engineering of Forest Products， National Forestry and Grassland Administration； National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass， Nanjing， Jiangsu Province， 210042	210042
SU Chen	Institute of Chemical Industry of Forestry Products， CAF； Key Lab of Biomass Energy and Material， Jiangsu Province； Co-Innovation Center of Efficient Processing and Utilization of Forest Resources， Jiangsu Province； Key Lab of Chemical Engineering of Forest Products， National Forestry and Grassland Administration； National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass， Nanjing， Jiangsu Province， 210042	210042
FANG Guigan	Institute of Chemical Industry of Forestry Products， CAF； Key Lab of Biomass Energy and Material， Jiangsu Province； Co-Innovation Center of Efficient Processing and Utilization of Forest Resources， Jiangsu Province； Key Lab of Chemical Engineering of Forest Products， National Forestry and Grassland Administration； National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass， Nanjing， Jiangsu Province， 210042 Shandong Huatai Paper Co.， Ltd.， Dongying， Shandong Province， 257335	257335
XIE Zhanghong	Yibin Paper Industry Co.， Ltd.，Yibin， Sichuan Province， 644109 Sichuan Province Engineering Technology Research Center of Bamboo Pulping and Papermaking， Yibin， Sichuan Province， 644109	644109
SHEN Kuizhong	Institute of Chemical Industry of Forestry Products， CAF； Key Lab of Biomass Energy and Material， Jiangsu Province； Co-Innovation Center of Efficient Processing and Utilization of Forest Resources， Jiangsu Province； Key Lab of Chemical Engineering of Forest Products， National Forestry and Grassland Administration； National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass， Nanjing， Jiangsu Province， 210042	210042

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Abstract:

The Neosinocalamus Affinis mechanical pulp （NAMP） from bamboo is hard to prepare high brightness pulp under conventional conditions due to the high lignin content， thick cell wall， and small pores of bamboo， which significantly increase the mass transfer resistance of bleaching liquor. Herein， a facile mild bleaching system， i.e.， alkaline hydrogen peroxide with ethanol-water media bleaching （AHEWB） system was proposed. The stubborn chromophoric groups in NAMP were destructed and dissolved because of the good solubility of lignin in ethanol and the strong nucleophilic attack ability of ethoxylate ion under alkaline conditions， which overcame the ceiling of NAMP brightness and led to an increased pulp brightness to more than 80% ISO. The characteristics of chromophoric groups obtained from NAMP under the traditional aqueous system and the AHEWB system under the same hydrogen peroxide dosage were systematically studied. The results showed that the stubborn chromophoric groups in NAMP mainly consisted of furan conjugated structure， cyclopentenones conjugated structure， and conjugated linkages of S’， G’， I， FA， and pCA. Overall， this study came up with a new guess that the ethoxylate ion of ethanol ionization under alkaline conditions played a key role in removing the stubborn chromophoric groups， which could provide theoretical basis and data support of AHEWB for developing an economically feasible and environmentally sustainable bamboo bleaching industry.

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