摘要
以玉米芯木质素为原料,通过超声波辅助解聚制备了木质素低聚物,研究解聚条件对木质素低聚物产率及相对分子质量的影响,并以凝胶渗透色谱(GPC)、红外光谱(FT-IR)、二维核磁共振谱(2D-HSQC NMR)与核磁共振磷谱(^(31)P NMR)表征木质素低聚物。研究结果表明:较优条件为在甲醇/水(4∶1,体积比)作溶剂体系,木质素与溶剂固液比200∶1(g∶L),超声波(频率40 kHz,功率240 W)处理3 h。此条件下制备的木质素低聚物的产率达到40.2%,所得木质素低聚物的数均相对分子质量(M_(n))为710,多分散指数(PDI)为1.62,保留了木质素的主要分子结构单元,同时其含总羟基10.49 mmol/g。
Lignin oligomers were prepared by ultrasonic-assisted depolymerization using corn cob lignin as raw material.The effects of depolymerization conditions on the yield and relative molecular mass of lignin oligomers were investigated,and the lignin oligomers were characterized by gel permeation chromatography(GPC),infrared spectroscopy(FT-IR),two-dimensional nuclear magnetic resonance spectroscopy(2D-HSQC NMR)and nuclear magnetic resonance phosphorus spectroscopy(^(31)P NMR).The results showed that the yield of resultant lignin oligomer reached 40.2%and the number-average molecular weight(M_(n))of obtained lignin oligomer was 710 under the conditions of ultrasonic treatment(frequency 40 kHz,power 240 W)for 3 h and the solid-liquid ratio of lignin to solvent 200∶1(g∶L)in methanol/water(4∶1,v∶v)solvent system.The polydispersity index(PDI)was 1.62,which reserved the main molecular structure units of lignin,and the total hydroxyl content was 10.49 mmol/g.
作者
刘婧伊
马林
王春鹏
储富祥
许玉芝
LIU Jingyi;MA Lin;WANG Chunpeng;CHU Fuxiang;XU Yuzhi(Institute of Chemical Industry of Forest Products,CAF,Key Lab.of Biomass Energy and Material,Jiangsu Province,Key Lab.of Chemical Engineering of Forest Products,National Forestry and Grassland Administration,National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass,Nanjing 210042,China;Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University,Nanjing 210037,China)
出处
《生物质化学工程》
CAS
2023年第6期8-14,共7页
Biomass Chemical Engineering
基金
国家自然科学基金资助项目(31770604)。
关键词
玉米芯木质素
解聚
超声波处理
低聚物
corn cob lignin
depolymerization
ultrasonic treatment
oligomer
