摘要
分别应用苯醇、水及醇水三种抽提溶剂对尾巨桉木片进行抽提,制得三种不同的抽提物。通过元素分析、溶出物微粒子粒径分析对其进行了基本溶出规律的研究;设计TG与Py-GC/MS实验,对不同方式获得的抽出物进行了热分析,对其受热分解特性以及产物的分布进行了考查。结果发现,不同抽提物的化学元素含量存在明显的差异;其中碳元素含量大小顺序为,苯醇抽提物(benzene-ethanol extractive,BEE)>醇水抽提物(ethanol-water extractive,EWE)>水抽提物(water extractive,WE),氧元素含量相反,其原因是由于不同抽提物所含的化合物种类存在较大差别。不同抽提物溶液之间的微粒子直径也存在较大的差异,粒径分析表明WE具有更大的粒径分布跨度并且大尺寸微粒子含量最高,而BEE与之相反。对于抽提物的热分析表明,不同抽提物所表现出的热解特性也存在较大差异,同样是抽提物所含化合物种类差异所致;WE的热解产物主要是酮类、酚类和脂类,BEE的热解产物主要是呋喃类、醇类、环烷烃、酮类及酚类。EWE的热解产物主要是呋喃、糠醛、酚类和脂类。
Eucalyptus grandis extractives were generated by different approaches using benzene/ethanol, water and ethanol/ water solutions respectively. Ultimate analysis and micro particle size detection were carried out to show the basic characteristics of extractives. TG analysis was designed to investigate the initial pyrolysis process of different extractives. Py-GC/MS analysis was adopted to show the detail information about the pyrolysis process and the distribution of the pyrolysis products, The basic characteristics including element composition and micro particle distribution both showed a certain diversity among the extractives. Ultimate analysis results showed a carbon content order as benzene/ethanol extractive （BEE）〉ethanol/water extractive （EWE）〉water extractive （WE） while the oxygen content was on the contrary. It was supposed that distinction of extractive compound species was the cause of element content differences. From the detection of micro particle distribution, the results showed that WE had more lager molecules while BEE showed the opposite tendency. It was considered that ethanol and water acted on the chips separately. be thermal analysis results showed that the diversity of compounds content also caused the differences of pyrolysis characteristics of different extractives. The main pyrolisis products of WE were ketones, phenols and esters, for BEE main pyrolisis products were furans, alcohols, aldehydes, ketones and phenols, for EWE main pyrolisis products were furans, phenols and esters.
出处
《纸和造纸》
北大核心
2011年第12期19-25,共7页
Paper and Paper Making
基金
博士后面上基金资助项目(20100480754)
关键词
热解
抽出物
微粒子
pyrolysis
extractive
micro particle
