热置换乙醇法制浆溶出木素的分级提纯与结构研究  

CLASSIFIED PURIFICATION AND THE STUDY ON STRUCTURE 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]陕西科技大学制浆与造纸工程学院,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2008年第6期1-6,共6页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(编号:205770327)

摘　　要：根据乙醇浓度范围的不同,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对其结构进行了分析.结果表明,因温度变化而析出的木素在溶出木素中占有很大比例,达到了总量的29.7%;有一部分β-O-4结构的木素随着木素大分子的溶出转移到了乙醇溶液中,而不是在发生断裂后再溶于蒸煮液中;在溶出木素中,低相对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 wheat straw ethanol pulping was separated and doing classified purification on it according to the different solubility of lignin in ethanol solution. The configuration of every fraction is studied by the methods of FT-IR and ^13C-NMR. The experiment show that the lignin deposited by the change of temperature hold a large proportion in dissolved lignin, account for 29.7%; 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; accompany with the broken of α- aryl ether linkages, condensation reaction occured in part of Cα.

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]