摘要
利用酸析法对造纸黑液中的木质素分级分离,得到3种不同的木质素。对得到的木质素进行傅里叶红外光谱(FTIR)、凝胶渗透色谱(GPC)、核磁共振波谱(13C NMR)以及元素含量测定,在溶解率、分子量分布及官能团和元素含量等方面进行比较。结果表明,木质素在DMF/水混合溶剂中溶解率可达到96%,DMF/水混合溶剂可作为材料制备过程中的液体反应介质。酸析分级分离制备的木质素的分散性逐渐降低,分散系数最小可达到1.57,分子量分布均一,适合在材料领域应用。
Classification of lignin in papermaking black liquor by acid precipitation method,get three different lignin.FTIR,GPC,13C NMR and elemental content determination of the obtained lignin,comparison in terms of dissolution rate,molecular weight distribution,functional group and element content.The results show that the dissolution rate of lignin in DMF-water mixed solvent can reach 96%.DMF-water mixed solvent can be used as a liquid reaction medium in the preparation of materials.The dispersibility of lignin prepared by acid precipitation fractionation is gradually reduced,and the dispersion coefficient can be as small as 1.57.Uniform molecular weight distribution,suitable for application in the field of materials.
作者
严振宇
魏录录
邓拥军
田庆文
房桂干
YAN Zhen-yu;WEI Lu-lu;DENG Yong-jun;TIAN Qing-wen;FANG Gui-gan(Institute of Chemical Industry of Forest Products,CAF,National Engineering Lab.for Biomass Chemical Utilization,Key and Open Lab.of Forest Chemical Engineering,SFA,Key Lab.of Biomass Energy and Material,Nanjing 210042,China;Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Foresty University,Nanjing 210037,China;Research Institute of Foresty New Technology,CAF,Beijing 100091,China)
出处
《应用化工》
CAS
CSCD
北大核心
2020年第7期1626-1629,共4页
Applied Chemical Industry
基金
十三五国家重点研发计划(2017YFD0601005)
中央级公益性科研院所基本科研业务费专项资金(CAFYBB2017ZX003-08)。
关键词
木质素
分级分离
分子量分布
lignin
fractionation
molecular weight distribution
