碱木素热解特性的初步研究  

Thermogravimetric Analysis of Pyrolysis Characteristics of Alkali Lignin

作　　者：郭伊丽[1] 武书彬[1] 王少光[1] 郭秀强[1] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《中国造纸学报》2007年第2期31-34,共4页Transactions of China Pulp and Paper

基　　金：国家自然科学资助基金(30371138;20576043)

摘　　要：用热重分析法研究了从黑液中提取碱木素的热解行为及其动力学规律,并分析了碱木素在不同升温速率下的热解特性。结果表明,碱木素的非等温失重过程由脱水、保持、剧烈失重和缓慢失重4个阶段组成,其热解的主要阶段大约在250～500℃,热解开始较早且持续的时间较长,热解后残余物的质量分数高达30%;根据Coats-Redfern法可描述热解过程并计算出样品在不同升温速率下的热解动力学参数。Pyrolysis characteristics and kinetics of alkali lignin separated from kraft black liquor were studied by thermogravimetric analysis. The effect of heating rate on the pyrolysis characteristics of alkali lignin was investigated. The results showed that the non-isothermal weight-loss process of alkali lignin includes the phases of dehydration, holding, rapid weight-loss and slow weight-loss. The pyrolysis of alkali lignin is mainly in the range of 250℃and 500℃. The pyrolysis process starts earlier and then continues for quite long time. The amount of pyrolysis residue is about 30%. The pyrolysis characteristics of alkali lignin are different from that of natural lignin. The derivative thermogravimetry （DTG） curves of alkali lignin show that as temperature raising rate increases, the maximum pyrolysis rate and the temperature at which pyrolysis rate reaches maximum increase. Based on the experiment, the Coats-Redfern method was used to analyze the pyrolysis process and calculate the kinetic parameters at the different heating rate. The pyrolysis process of alkali lignin can be described with one step first-order reaction in the main pyrolysis region.

关 键 词：碱木素 热重分析 动力学 热解 

分 类 号：TS79[轻工技术与工程—制浆造纸工程]