基于热重红外的硫酸盐法黑液热解特性分析  

TG-FT-IR Analysis of Pyrolysis Characteristics of Sulfate Black Liquor

作　　者：刘超[1] 武书彬[1] 戴涛[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：《林产化学与工业》2014年第3期22-26,共5页Chemistry and Industry of Forest Products

基　　金：国家973计划资助(2013CB228101);国家自然科学基金资助项目(31270635;21176095)

摘　　要：为了深入地探讨黑液热解的反应机理以及黑液热解过程中产物的释放规律,采用热重-红外联用（ TG-FT-IR）技术对竹子和桉木混合硫酸盐法制浆黑液固形物（ BLS）的热裂解过程进行了研究。 TG-FT-IR结果显示,BLS热解产物的释放主要集中在500~2000 s,热解产物主要是 CO2、CH4、H2O、CO、醇酚类化合物和醛酮类化合物。 BLS的整个热解过程可分为3个阶段,第1阶段的失重主要是原料中结合水的挥发引起的,此阶段的最大失重速率出现在105℃；第2失重阶段主要发生在173~518℃,失重率约为25.19%,主要产物是CO2、CH4、H2O、醇酚类化合物、醛酮类化合物以及少量的CO,此阶段CO2的生成量最大；第3阶段主要发生在722~1000℃,失重率接近39.05%,产物主要是CO,其它小分子产物的产率都很低。To investigate the pyrolysis mechanism and the release law of pyrolysis prodncts, the sulfate black liquor （BLS） from bamboo ＆ eucalyptus was pyrolyzed and the process was investigated by thermogravimetric analyzer coupled with Fourier transform infrared spectrometry （TG-FT-IR）. The results revealed that the release of BLS pyrolysis products, such as C02, CH4, H20, CO and alcohols ＆ phenols, aldehydes ＆ ketones, were mainly concentrated in 500 - 2 000 s. The BLS pyrolysis process could be divided into three stages. The weight loss in the first stage should be attributed to the release of bound water in the raw material and the maximum weight loss rate was observed at 105 ℃. During the second weight loss stage from 173 ℃ to 518 ℃, the weight loss rate was about 25. 19% , and the release products were CO：, CH4, H20, alcohols ＆ phenols, aldehydes ＆ ketones and a small amount of CO, and COs was the dominant product. The third weight loss stage was from 722 ℃ to 1 000 ℃, and the weight loss rate was nearly 39.05%. In this stage, CO was the dominant product and very few amounts of other small molecule products were observed.

关 键 词：硫酸盐法 黑液 热解 热重红外 

分 类 号：TQ35[化学工程] TK6[动力工程及工程热物理—生物能]