常压醋酸法分离毛竹木质素

摘要

In the goal of increasing the efficiency extraction of lignin from bamboo by atmospheric acetic acid process and of understanding the chemical structure changing during the process, series of single factor experiments had been done in present investigation. This result shows the optimum extraction conditions is: 90% aqueous AcOH, 3%H2SO4, ratio of liquor to bamboo fillings 12:1, pulping temperature 106℃ , and pulping time 2.5 h. The UV, FTIR, and NMR spectra results shows that the functional groups and chemical bond in MWL and acetic acid lignin are quite similar, excepting acetic acid lignin has more phenolic hydroxyl groups, so its chemical activity is more stonger, which is an advantage for further utilization.%为了提高常压醋酸法分离毛竹木质素的效率,深入了解过程中醋酸法毛竹木质素化学结构特征,采用单因素逐步优化方法得出最佳的毛竹木质素分离条件为:醋酸溶液浓度90％,硫酸用量3％,液固比12∶1,在106℃下保温时间2.5h;采用紫外光谱、红外光谱及磁共振波谱等检测结果表明:毛竹磨木木质素与醋酸木质素主要化学官能团和化学键基本一致,基本化学结构保存完好,但醋酸木质素酚羟基增多,化学活性增强,有利于更进一步的开发利用.