林产化学与工业2025，Vol.45Issue(2)：103-108,6.DOI:10.20195/j.issn.0253-2417.2024014
碱木质素的甲基化改性降色及浅色微球制备
Methylation of Alkali Lignin for Color Reduction Toward the Preparation of Light-colored Microspheres
摘要
Abstract
The alkali lignin(AL)extracted from paper black liquor was methylated with dimethyl sulfate to block the phenol hydroxyl group to avoid forming quinone type dark structure to achieve reduction.The optimal conditions for color reduction by methylation were as follows:the amount of dimethyl sulfate was 60％of AL,the reaction time was 2 h,and the reaction temperature was 80 ℃.Under this condition,the whiteness of methylated lignin(MAL)increased by 25.81％at 400 nm and 31.76％at 450 nm.The content of phenol hydroxyl in lignin was measured by differential ultraviolet methods,and the content of phenol hydroxyl in lignin was 3.175 mmol/g,which decreased to 0.875 mmol/g after methylation.MAL microspheres were prepared by adding 2 mol/L HCl solution to the methylation reaction products at a rate of 0.5 mL/min.The size distribution of the microspheres was the most uniform,the particle size was about 0.4-0.9 μm,and it's color lightened further.关键词
碱木质素/酚羟基封闭/甲基化改性/颜色/木质素微球Key words
alkali lignin/phenolic hydroxyl group closure/methylation modification/color/lignin microspheres分类
化学化工引用本文复制引用
张倩,李赢..碱木质素的甲基化改性降色及浅色微球制备[J].林产化学与工业,2025,45(2):103-108,6.基金项目
江苏省科技计划重点研发项目(BE2020381) （BE2020381）
