木粉及其组分的多元醇酸催化热化学液化  

Study of Liquefaction of Wood and Its Components in Polyhydric Alcohol

作　　者：张海荣[1,2] 庞浩[1] 石锦志[1] 廖兵[1] 

机构地区：[1]中国科学院广州化学研究所纤维素化学重点实验室,广东广州510650 [2]中国科学院研究生院,北京100039

出　　处：《林产化学与工业》2012年第2期14-20,共7页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金委员会NSFC-广东联合基金(U0834005);广东省国际合作项目(2008B050100016);广东省自然科学基金研究团队项目(E06200692)

摘　　要：分别将木粉、纤维素和木质素在乙二醇中进行热化学液化。研究结果表明木粉中纤维素的非结晶区、木质素和半纤维素首先被液化,而纤维素的结晶区较慢被液化,到液化反应中期基本降解完全,液化产率高于97%。利用在线红外光谱仪跟踪检测了整个液化反应过程,结合GC-MS结果发现:乙二醇在反应过程中脱水生成了二甘醇和三甘醇。在液化反应中,纤维素的糖苷键断裂后生成葡萄糖苷结构,随后葡萄糖苷中的吡喃环也被打开,生成的活性中间体相互反应或与乙二醇反应生成了如3-(2-甲基-[1,3]-二氧戊环-2-基)-丙酸乙酯、乙酰丙酸丁酯等酯类;木质素的苯丙烷结构主要降解为苯酚、2,6-甲氧基苯酚等芳香族衍生物,因此木粉液化产物是聚醚/酯混合多元醇。Liquefaction of wood powder, cellulose and lignin have been studied using ethylene glycol （EG） as liquefaction reagents in presence of sulfuric acid as catalyst, respectively. The results showed that the components of wood （ lignin, hemicellulose and amorphous region of cellulose） were easily liquefied compared with crystalline region of cellulose. The liquefaction yield was up to 97%. The ReactIR reaction analysis system with the combination of gas chromatography and mass spectrometry （ GC- MS ） analysis showed that the liquefied wood products mainly contained EG and its derivatives （ diethylene glycol trithylene glycol and dioxane） , saccharides, alcohols, aldehydes, ketones, phenols, especially some acids such as formic acid, levulinic acid, oxalic acid and their esters. The structural characteristics of these products indicated that the cellulose can be degraded completely to butyl 4-oxopentanoate, ethyl 3-（2-methyl-1,3-dioxolan-2-yl） propanoate et al. , and lignin phenyl propane units were decomposed to aromatic derivatives. Therefore, the liquefied product of wood was a mixture of polyether and/or polyester polyols.

关 键 词：木粉 纤维素 木质素 多元醇液化 在线红外 

分 类 号：TQ351[化学工程]