蔗渣碱木素液化制备酚类化合物  

Production of Phenolic Chemicals via Liquefaction of Alkali Lignin from Bagasse

作　　者：隋鑫金[1] 武书彬[1,2] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640 [2]中国科学院可再生能源与天然气水合物重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2011年第1期1-6,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"973"计划项目(2007CB210201);国家"863"计划项目(2007AA05Z456);中国科学院可再生能源与天然气水合物重点实验室开放基金资助项目(0807K1)

摘　　要：为了提高蔗渣碱木素的利用价值,以硅酸铝为催化剂催化碱木素的液化过程来制备酚类化合物.对硅酸铝用量、加热时间、加热温度、溶剂体积与溶质质量比等工艺条件进行了优化,确定了最优条件为:硅酸铝用量为绝干碱木素质量的4%,加热时间1h,加热温度270℃,溶剂(丙三醇)体积与溶质(蔗渣碱木素)质量比为6mL/g,此条件下酚类化合物的总得率为54.10%(相对于碱木素干重),所得酚类产物的主要成分是2,6-二甲氧基苯酚、2-甲氧基苯酚和苯酚.采用红外光谱和核磁共振氢谱检测碱木素反应前后的官能团结构,发现:在硅酸铝的催化下,加热温度达270℃时,木素结构中的脂肪族侧链与苯环分离,大量β位的醚键会因为高温和酸的共同作用而发生断裂,少量α位的醚键同样会发生断裂并随着脂肪族侧链的断裂而生成苯酚.In order to increase the utilization value of alkali lignin from bagasse,aluminium silicate was chosen as the catalyst to produce phenolic chemicals from the lignin via a liquefaction process.The reaction conditions including aluminium silicate dosage,heating time,heating temperature and liquid-solid（glycerol-bagasse alkali lignin） ratio were then optimized as follows： an aluminium silicate dosage of 4%（based on the dry bagasse alkali lignin）,a heating duration of 1 h,a heating temperature of 270℃ and a liquid-solid ratio of 6 mL/g（based on the dry bagasse alkali lignin）.In these conditions,phenolic chemicals mainly containing 2,6-dimethoxy-phenol,2-methoxy-phenol and phenol were produced,with a total yield of 54.10%.Moreover,the structures of functional groups of the alkali lignin before and after the liquefaction were analyzed by means of FT-IR and 1H NMR.The results show that,when the heating temperature reaches 270 ℃,the propane units of the phenylpropane separate from benzene units in the presence of aluminium silicate,and the β-ether lingkages（β-O-4） break due to high temperature and the existence of acid.At the same time,few α-ether lingkages（α-O-4） break to produce phenols following the separation of propane units.

关 键 词：蔗渣 碱木素 液化 丙三醇 酚类化合物 

分 类 号：TK6[动力工程及工程热物理—生物能] X793[环境科学与工程—环境工程]