摘要
利用酸析法从黑液中分离粗木素,采用甲酚硫酸法、液–液抽提法及弱酸法对所得粗木素进行纯化,通过红外光谱(FTIR)、扫描电镜(SEM)、X射线荧光光谱(XRF)、热重(TGA)分析对木素纯化前后的结构变化、表面形态变化、无机盐杂质去除率及热稳定性的变化进行表征,对比3种不同方法对粗木素的纯化效果.结果表明,所用纯化方法基本没有破坏木素的结构,纯化后木素的无机盐含量降低,热稳定性提高,其中弱酸法是3种纯化方法中无机盐去除率最高的方法,甲酚硫酸法所得纯化木素的热稳定性最好.
Crude lignin was separated from black liquor with acid precipitation method first. Crude lignin was then purified by using three different methods: cresol and sulphuric acid method, liquid-liquid extraction method and weak acid method. The changes of lignin's structure, surface morphology, inorganic salt removal rate and the thermo stability before and after purification were characterized with FTIR, SEM, XRF and TGA. So the effect of three purification methods would be compared. The results show that the structure of lignin has not been destroyed, the content of inorganic salt has been decreased and the thermo stability of lignin has been improved. The most inorganic salt can be removed with the weak acid method and the thermo stability of lignin is the best when purified with the cresol and sulphuric acid method.
作者
谭惠珊
惠岚峰
刘梦茹
王倩倩
许海洋
TAN Huishan;HUI Lanfeng;LIU Mengru;WANG Qianqian;XU Haiyang(Tianjin Key Laboratory of Pulp and Paper,College of Papermaking Science and Technology,Tianjin University of Science & Technology,Tianjin 300457,China;State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China)
出处
《天津科技大学学报》
CAS
2019年第2期40-44,共5页
Journal of Tianjin University of Science & Technology
基金
国家自然科学基金资助项目(21576213)
制浆造纸工程国家重点实验室开放基金项目(201504)
关键词
碱木素
纯化
表征
alkali lignin
purification
characterization
