杨木乙醇制浆中木素结构变化的研究  

Change of Aspen Lignin Structure in Auto-catalyzed Ethanol-water Pulping

作　　者：周景辉[1] 隋鑫金[1] 平清伟[1] 

机构地区：[1]大连工业大学辽宁省制浆造纸工程重点实验室,辽宁大连116034

出　　处：《中国造纸学报》2008年第3期16-20,共5页Transactions of China Pulp and Paper

基　　金：辽宁省自然科学基金资助项目(20052160)

摘　　要：通过红外光谱、核磁共振氢谱技术手段研究了杨木自催化乙醇制浆中木素结构的变化。通过结果推测得出,木素分子可能发生了如下变化过程:木素大分子的α-O-4和β-O-4烷基芳基醚键大量断裂,醚的烷基部分在α位和β位生成碳正离子,而醚的芳基部分氧带负电,接受H+形成酚羟基。由于苯环上电子云电负性的作用,使剩余未断裂的α位醚键或羟基重排到β位,α位变成碳正离子,β位生成醚键或羟基,该醚键继续断裂,从而使木素大分子碎解成小分子而被乙醇溶剂溶出,所形成的α位碳正离子与其他苯环上酚羟基重新缩合成醚键。The change of aspen lignin structure in auto-catalyzed ethanol-water pulping was studied by IR and 1H-NMR. Firstly, cleavage of or-ether linkages （α-O-4） and 1-ether linkages （β-O-4） occurs significantly, C ＋ ions are found at α-C and β-C, meanwhile ether linkages change into phenolic hydroxyl. Secondly, β-C＋ occurs recomposition because of benzene electronegative attraction, α-ether linkages and α- hydroxy are reeomposited to β-ether linkages and β-hydroxy, α-C is changed into C ＋. So new β-ether linkages cleavage will continue, more lignin units are removed by ethanol. Finally, α-C ＋ recreates α-O-4 linkages with electronegative benzene, β-C creates β-ether linkages and β-hydroxy.

关 键 词：杨木自催化乙醇制浆 木素结构 红外光谱(IR) 核磁共振氢谱(1H—NMR) 脱木素机理 

分 类 号：TS743.9[轻工技术与工程—制浆造纸工程]