热置换乙醇法制浆溶出木素的分级提纯及其结构  

Fractionation Purification and the Structure Study of Dissolved Lignin in RDH Ethanol Pulping

作　　者：张美云[1] 岳小鹏[1] 徐永建[1] 

机构地区：[1]陕西科技大学造纸工程学院,陕西西安710021

出　　处：《中国造纸学报》2009年第1期51-55,共5页Transactions of China Pulp and Paper

摘　　要：对热置换麦草乙醇法制浆黑液中的溶出木素进行了分级分离提纯,并采用FT-IR、13C-NMR等分析技术,对其进行了研究。结果表明,溶出木素中由于温度变化析出的部分占有很大比例,当温度降至50℃时,黑液中可溶解的木素达到了总量的29.7%。一部分β-O-4结构的木素随着木素大分子的溶出转移到乙醇溶液中,而不是在发生断裂后再溶于蒸煮液中。在溶出木素中,低分子质量部分中包含了更多的羟基和羰基结构,其中包括大量的共轭羰基结构。伴随着α-O-4键的断裂,部分Cα上发生了与芳香环的缩合反应。In this paper,the dissolved lignin in black liquid of RDH（Rapid Displacement Heating）wheat straw ethanol pulping was separated and fractionation purified according to the different solubility of lignin in ethanol solution.The configurations of fractions were studied by using the methods of FT-IR and ^13C-NMR.The experiment showed that the lignin deposited by the change of temperature accounts for 29.7% of the dissolved lignin,part of β-aryl ether linkages are broken in the black liquor,not in the pulp;low molecular weight fraction of dissolved lignin contains more hydroxyl,carbonyl structure;condensation reaction occurs in part of Cαaccompanying with the broken of α-aryl ether linkages.

关 键 词：溶出木素 分级 结构 乙醇法制浆 热置换 

分 类 号：TS743[轻工技术与工程—制浆造纸工程]