蔗渣木质素液化影响因素及其产物表征  

Impact Factors of Bagasse Lignin Liquefaction and Characterization of Its Products

作　　者：覃琼林 刘金明 谢恩俊 冯睿 张建辉 甘卫星 QIN Qiong-lin;LIU Jin-ming;XIE En-jun;FENG Rui;ZHANG Jian-hui;GAN Wei-xing(College of Environment and Resources,Guangxi Normal University,Guilin 541000,Guangxi,P.R.China;Guangxi Guanglin Xincai Wood Industry GroupCo.,Ltd.,Nanning 530022,Guangxi,P.R.China;Industry Development and Planning Institute,National Forestry and Grassland Administration,Beijing100010,P.R.China)

机构地区：[1]广西师范大学环境与资源学院,广西桂林541000 [2]广西广林新材木业集团,广西南宁530022 [3]国家林业和草原局产业发展规划院,北京100010

出　　处：《林产工业》2024年第5期6-11,18,共7页China Forest Products Industry

基　　金：国家科技支撑计划项目(2015BAD14B03);广西科技重大专项(桂科AA21077001,AA18118044,AA17204067)。

摘　　要：生物质液化是实现农林废弃物的高值转化和梯次化替代化工原料的重要技术手段。本文选用有机溶剂液化法对蔗渣木质素进行液化,探究不同液化参数(催化剂量,液固比,液化温度,液化时间)对其液化效率的影响,并结合正交试验进行液化工艺优化,同时对液化产物进行表征。结果表明:蔗渣木质素液化优化工艺参数为:液化温度150℃,液化时间1 h,液固比3∶1,催化剂量15%,此时残渣率为0.87%。蔗渣木质素在苯酚和硫酸的共同作用下,由原本的球形、球凹形结构降解成残渣颗粒。液化反应通过裂解、脱水、脱氢、脱氧和脱羧等方式,断裂连接蔗渣木质素大分子结构间的醚键和碳碳键,并通过缩合、羟甲基化和醚化反应重新排列液化中间产物中的小分子片段,最终形成较稳定的、可溶于苯酚的复杂混合物。Biomass liquefaction is an useful technique to realize the high-value conversion and recycling uses of agricultural and forestry waste,as well as for substituting chemical feedstocks.In this paper,the organic solvent liquefaction method was used to liquefy bagasse lignin.The effects of different liquefaction parameters(catalyst dosage,liquid-solid ratio,liquefaction temperature,liquefaction time)on the liquefaction efficiency of bagasse lignin were explored,and its liquefaction products were also characterized.The results showed that the optimized process parameters for liquefaction of bagasse lignin were as follows:the liquefaction temperature was 150℃,the liquefaction time was 1 h,the liquid-solid ratio was 3∶1,the catalyst dosage was 15%,and the residue rate of bagasse lignin was 0.87%.Under the combined action of phenol and sulfuric acid,bagasse lignin was degraded from its original spherical and spherical concave structure into residual particles.The ether bonds and the carbon-carbon bonds connecting the macromolecular structure of bagasse lignin were broken in different ways during the liquefaction process,such as pyrolysis,dehydration,dehydrogenation,deoxygenation,and decarboxylation.Subsequently,small molecular fragments in the liquefied intermediate products rearranged through condensation,hydroxyl methylation,and etherification reactions.Finally,stable and complex mixtures generated,which were soluble in phenol.

关 键 词：木质素 蔗渣 苯酚 液化 液化产物 

分 类 号：TS6[轻工技术与工程] TS396