文献类型：期刊文献

英文题名：Bleachability Improvement of Eucalypt Mechanical Pulps Using Hydrogen Peroxide in Ethanol-water Media

作者：Jiao, Jian[1,2,3,4] Fang, Guigan[1,2,3,4] Liang, Fangmin[1,2,3,4] Deng, Yongjun[1,2,3,4] Shen, Kuizhong[1,2,3,4] Tian, Qingwen[1,2,3,4] Han, Shanming[1,2,3,4] Zhu, Beiping[1,2,3,4]

第一作者：Jiao, Jian;焦健

通信作者：Fang, GG[1];Fang, GG[2];Fang, GG[3];Fang, GG[4]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Peoples R China;[2]Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Peoples R China;[3]Jiangsu Prov Key Lab Biomass Energy & Mat, Nanjing 210042, Peoples R China;[4]Nanjing Forestry Univ, Collaborat Innovat Ctr High Efficient Proc & Util, Nanjing 210037, Peoples R China

年份：2020

卷号：15

期号：1

起止页码：1370-1383

外文期刊名：BIORESOURCES

收录：;EI(收录号：20203008969188);Scopus(收录号：2-s2.0-85088249945);WOS:【SCI-EXPANDED(收录号:WOS:000511129100094)】；

基金：This work was financially supported by the National Key Research and Development Program "High Efficiency Clean Pulping and Functional Product Production Technology Research" (grant number 2017YFD0601005).

语种：英文

外文关键词：Alkali sensitivity; Alkaline darkening; Peroxide bleaching; Ethanol-water bleaching media; Eucalypt mechanical pulp

摘要：Alkaline darkening has a negative effect on chemimechanical pulps produced from various eucalypt chips. For instance, the pulp's brightness has been found to drop rapidly when alkali addition exceeds its optimum amount. Therefore, to compare the effects of different media on brightness gain, eucalypt mechanical pulps were bleached using a typical peroxide bleaching sequence in a water medium and in an ethanol-water (E/W) medium. Various pulp brightness levels and changes of residue chemicals in the spent bleaching liquors were investigated. Compared to water medium, the net brightness gain notably increased when using the E/W medium at the same chemical dosages. The rate of pulp brightness loss caused by increasing alkali dosage dropped in the ENV medium. Analyses based on ultraviolet-visible diffuse reflectance spectra of bleached pulps, as well as gel permeation chromatography and pyrolysis gas chromatography-mass spectrometry spectra of the residues in the spent bleaching liquors, indicated that the contributions to brightness improvement from ethanol-water media could be explained by the selective dissolution and removal of phenolic- or guaiacyl-structured lignin fragments that result in the formation of chromophoric groups under alkaline conditions.