摘要
将竹粉在乙二醇中进行热化学液化,利用在线红外光谱仪跟踪检测,对竹粉的醇解液化反应过程进行了详细的红外光谱分析。结果表明,羟基峰3 400 cm-1的减弱和羰基峰1 720 cm-1及醚键1 124 cm-1峰的增强非常明显。同时,由液化产物分离分析的结果可以推断,竹粉纤维素分子链断裂后,其吡喃环葡萄糖结构单元也被开环,生成了戊酸乙酯、5羟-甲基呋喃乙酯、乙二醇缩-2羰-基戊酸乙酯等物质。木质素的苯丙烷结构被降解成2甲-基苯酚、2甲-氧基苯酚、2,6甲-氧基苯酚等酚衍生物。在液化降解过程中产生的这些活性基团因不稳定而被酯化、醚化或相互间缩合,故液化产物其实是聚醚/酯混合多元醇。
Bamboo was liquefied in ethylene glycol in the presence of sulfuric acid as catalyst, and realtime IR was used to detect the reaction during the whole experiment. The intensities of the bands at 1 720 cm^- 1 and 1 124 cm^ -1 strengthened, and that at 3 400 cm^-1 weakened with the liquefaction time. The IR results were analysed in detail to describe the degradation and decomposition of bamboo, and the product was separated into several parts which were analysed by GC-MS. It indicated that the cellulose was degraded completely to pentanoic acid ethyl ester, 2 （3H）-furanone, （acetyloxy）dihydro-5-methyl, and lignin phenylpropane units were also decomposed to hydroxylic, carbnoxylic and aromatic derivatives, and these reactive intermediates could be polymerized to form insoluble residues.
出处
《应用化学》
CAS
CSCD
北大核心
2009年第2期187-192,共6页
Chinese Journal of Applied Chemistry
基金
广东省自然科学基金资助项目(E06200692)
广州市科技计划项目(06a1406285)
广东省攻关项目(2006A20401001)
