林业工程学报2018，Vol.3Issue(2)：59-63,5.DOI:10.13360/j.issn.2096-1359.2018.02.010
硫酸盐法木浆黑液中木质素燃烧特性研究
Study on combustion characteristics of lignin in black liquor of kraft pulp
摘要
Abstract
Lignin was extracted from the black liquor of kraft pulping by using ethanol?sulfuric acid. The combustion and pyrolysis properties of extracted lignin(CSL)were studied by using elemental analyzer,oxygen bomb calorime?ter,thermogravimetric analyzer,and electron microscope. The contents of C,H,combustion heat,pyrolysis charac?teristics and surface morphology of the CSL were measured and analyzed. The results showed that the C, H and O contents were 62.55%,5.57% and 29.53%,respectively,which were higher than those of black liquor and acid lignin (SL). The hydrogen?carbon ratio of the CSL and SL was 1.057 and 1.068, which was much lower than that of the black liquor. The combustion heat of the CSL is 22.237 kJ/g, and that of the SL is 21.591 kJ/g, which was higher than that of black liquor,indicating the CSL has more potential used as fuel than the SL and black liquor do. The py?rolysis process of the CSL consisted of four stages including the water release phase,the fat bond breaking stage,the ether bond break stage and the depolymerization stage. There were two weight loss peaks in the pyrolysis of alkyd lig?nin at 350℃ and 369℃. The maximum weight loss rate was 13%/min and the final percentage of residue mass was 35.48%. Compared with the SL,the CSL had a faster pyrolysis rate and more complete pyrolysis. Compared with the black liquor and the SL,the CSL surface had more voids,and the particle size was smaller,which also made the CSL burned more completely. The results indicated that the combustion performance of the lignin extracted from papermak?ing black liquor by ethanol sulfuric acid method is better than that of the lignin and the black liquor extracted by pure sulfuric acid method.关键词
CSL/黑液/燃烧热/热解特性Key words
CSL/black liquor/combustion heat/pyrolysis characteristics分类
农业科技引用本文复制引用
李媛媛,王传贵,张双燕..硫酸盐法木浆黑液中木质素燃烧特性研究[J].林业工程学报,2018,3(2):59-63,5.基金项目
林业公益性行业科研专项(201504610-2). （201504610-2）
