摘要
以微晶纤维素、木聚糖和碱性木质素分别作为生物质3组分（纤维素、半纤维素和木质素）的模型物,利用傅立叶变换红外光谱技术（FT-IR）对生物质3组分结构进行了表征,并对3组分进行了真空热解特性分析,同时利用气质联用技术（GC-MS）对3组分真空热解液化后的生物油进行了成分分析,初步探讨了各组分的真空热解液化机理。研究结果表明,纤维素含有吡喃环、β-糖苷键等特征结构,真空热解时失重区间较窄（250-400℃）,真空热解油产率较高（73.79%）,产物主要有2,5-二甲基呋喃（9.32%）、2,6-二甲氧基苯酚（5.72%）和左旋葡聚糖（17.04%）等;木聚糖中存在β-糖苷键、阿拉伯糖侧链等结构,支链多,热稳定性差,真空热解油主要含有乙酸（10.11%）、羟基丙酮（18.42%）和糠醛（13.15%）等;木质素中含有较多的芳香族类物质结构,热解缓慢,失重区间较宽（185-550℃）,热解终了时固体残留物较多,为29.67%,真空热解油中苯酚（16.24%）、愈创木酚（20.37%）等酚类物质较多。
The molecular structure of three components（ cellulose,xylan,and lignin） in biomass was detected by Fourier transform infrared spectroscopy（ FT-IR）. The vacuum pyrolysis behavior and kinetics of the three components were investigated.The vacuum pyrolysis mechanism was studied on the basis of gas chromatography-mass spectrometer（ GC-MS） analysis for biooils obtained from the vacuum pyrolysis. It was found that the cellulose contained molecular structures such as pyran ring and β-glucosidic bond. During the pyrolysis process temperature from 250 ℃ to 400 ℃,the yield was 73. 79% and main products generated from pyrolysis were 2,5-dimethyl-furan（ 9. 32%）,hydroxyacetone（ 5. 13%） 2,6-dimethoxy-phenol（ 5. 72%） and levoglucosan（ 17. 04%）. Due to high content of side-chain groups,the xylan performed thermal unstability under high temperature. The main pyrolysis products were hydroxyacetone（ 18. 42%）,acetic acid（ 10. 11%） and furfural（ 13. 15%）.Lignin contained amounts of aromatic substances,which trends to represent slow pyrolysis process and a wider range of pyrolysis temperature from 185 ℃ to 550 ℃. The solid residue from pyrolysis of lignin was up to 29. 67% with the main pyrolytic products such as phenols（ 16. 24%） and guaiacol（ 20. 37%）.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2015年第1期94-100,共7页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(51276085)
江苏省自然科学基金项目(BK2011488)
江苏省博士研究生科研创新资助项目(KYLS_1039)
作者简介
尹海云（1989-），女，安徽合肥人，硕士生，主要从事动力机械新能源开发与利用
通讯作者：蔡忆昔（1957-），教授，博士生导师，研究领域为动力机械工作过程及排放控制；E-mail：qc001@ujs．edu．cn。
