氧化氨解工艺对工业木素氮形态分布的影响  

Effects of Oxidative Ammonolysis on Nitrogen Forms of Technical Lignin

作　　者：钟哲科[1] 邹景泉[2] 江波[2] 高智慧[2] 

机构地区：[1]国家林业局竹子研究开发中心,杭州310012 [2]浙江省林业科学研究院,杭州310023

出　　处：《造纸科学与技术》2006年第2期31-33,27,共4页Paper Science & Technology

基　　金：浙江省自然科学基金资助项目(M303487)

摘　　要：通过采用不同的氧化氨解工艺生产氮改性木素的研究,比较了总氮、不同形态氮的分布、有机碳、羧基和甲氧基含量以及工业木素在反应前后化学结构的变化,表明采用高压工艺能使木素在短时间内结合较多的氮,其中有近一半的氮以不易水解的有机氮形式存在,且在反应结束后得到的氮改性木素中总碳含量明显减少,而采用常压工艺生产的氮改性木素中铵态氮和羧基的含量比例较高。另外,从13C-NMR的分析比较表明,氧化氨解反应虽然给工业木素带来了一定程度上的裂解和缩合,但其木素大分子的基本结构仍保持较完整。研究表明,利用低压工艺生产的氮改性木素中的氮将更有利于植物的利用。Through comparatively study on the total N, different group of the N-modified lignin produced under different reaction N forms, organic C, methoxyl group, carboxyl conditions and chemical structure of lignin before and after oxidative ammonolysis, it was showed that under high pressure reaction condition technical lignin could integrate more nitrogen in shorter period of time, and nearly half of which existed in a tightly combined organic ni- trogen form, meanwhile, the C content of lignin was significantly reduced after the reaction. By contrast, the N-mod- ified lignin produced under the normal pressure reaction condition contained more high proportion of NH4-N form and methoxyl group. In addition, based on the 13C-NMR analysis, the oxidative ammonolysis, to some extent, caused decomposition and condensation of lignin, however, the lignin structure was basically preserved. The study results showed that the nitrogen in N-modified lignin produced from low-pressure procedure could be more favorable for plant use.

关 键 词：工业木素 氧化氨解 氮形态 反应工艺 化学结构 

分 类 号：TS721.1[轻工技术与工程—制浆造纸工程]