文献类型：期刊文献

中文题名：不同溶剂辅助碱性过氧化氢脱除木质素的研究

英文题名：Delignification by Alkaline Hydrogen Peroxide Assisted with Different Solvents

作者：朱北平[1] 焦健[1] 梁芳敏[1] 邓拥军[1] 房桂干[1,2]

第一作者：朱北平

机构：[1]中国林业科学研究院林产化学工业研究所,江苏省生物质能源与材料重点实验室,国家林业和草原局林产化学工程重点实验室,林木生物质低碳高效利用国家工程研究中心,江苏省林业资源高效加工利用协同创新中心,江苏南京210042;[2]山东华泰纸业集团,山东东营257335

年份：2023

卷号：43

期号：4

起止页码：74-80

中文期刊名：林产化学与工业

外文期刊名：Chemistry and Industry of Forest Products

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

基金：中国林科院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2021ZI001-01);泰山产业领军人才工程专项经费资助项目(tscy20200213)。

语种：中文

中文关键词：碱性过氧化氢;脱木质素;有机溶剂

外文关键词：alkaline hydrogen peroxide;delignification;organic solvent

分类号：TQ35

摘要：为了探究木质纤维原料在不同有机溶剂辅助碱性过氧化氢条件下脱除木质素的效果,以碱性过氧化氢体系(AHP)为参照,考察了乙醇碱性过氧化氢(EAHP)、二氧六环碱性过氧化氢(DAHP)对杨木机械浆脱除木质素后的组分变化。通过高效液相色谱(HPLC)、傅里叶变换红外光谱(FI-IR)、凝胶渗透色谱(GPC)、核磁共振磷谱(^(31)P NMR)表征分析了碱木质素(AL)、碱性过氧化氢木质素(AHPL)、乙醇碱性过氧化氢木质素(EAHPL)和二氧六环碱性过氧化氢木质素(DAHPL)的化学结构、分子质量和羟基含量的变化。研究结果表明:3种反应体系均导致脱木质素后物料得率不同程度降低,并导致了大量半纤维素的溶出。与AHP、DAHP相比,EAHP更有利于保存纤维素和溶出较多的木质素,木质素脱除率最高达65%。与AL相比,AHPL、EAHPL、DAHPL红外光谱峰型基本一致,均属于GS型。制备的木质素数均分子质量(M_(n))最小为4672 g/mol,分散性较好,酚羟基的量较少,但是脂肪族羟基和羧基羟基的量较高,最高值分别为14.95和1.25 mmol/g。
In order to explore the effect of delignification under different organic solvent-assisted alkaline hydrogen peroxide treatment,the composition changes of poplar mechanical pulp after lignin removal by ethanol alkaline hydrogen peroxide(EAHP) and dioxane alkaline hydrogen peroxide(DAHP) were investigated using the alkaline hydrogen peroxide system(AHP) as a reference.The chemical structure,molecular weight,and hydroxyl content of alkali lignin(AL) and alkaline hydrogen peroxide lignin(AHPL),ethanol alkaline hydrogen peroxide lignin(EAHPL) and dioxane alkaline hydrogen peroxide lignin(DAHPL) were characterized by high-performance liquid chromatography(HPLC),Fourier transforms infrared spectroscopy(FT-IR),gel-permeation chromatography(GPC),and ~(31)P nuclear magnetic resonance(~(31)P NMR).The results showed that the three reaction systems led to the varying degradation degrees of the material yield and the dissolution of a large number of hemicellulose.Compared with AHP and DAHP,EAHP was more conducive to preserve cellulose and dissolve more lignin,and the highest lignin removal rate reached 65%.Compared with AL,AHP,EAHPL and DAHPL possessed basically the same infrared spectral peak type,both belonging to G-S type.The minimum M_(n) of the prepared lignin was 4 672 g/mol with low polydispersity and low phenolic hydroxyl content,while it had higher aliphatic hydroxyl group and carboxylic acid hydroxyl group contents,with the highest contents of 14.95 and 1.25 mmol/g,respectively.