【作者】 刘超；

【导师】 武书彬；

【作者基本信息】 华南理工大学 ， 制浆造纸工程， 2015， 硕士

【摘要】 木质素广泛地存在于木质纤维类生物质中,芳香和脂的特性,可以被改性利用相于水合物,木质素的热值很高,作种可再生能源能在定程度替代石能源的使用,效地少排放降染在木质素的利用方面,热解是种之效的,前的方法,可以将木质素可燃气生物和焦炭热解得到的生物能够被提质,生产液体燃料和高值的精细学品作种良的短周期纸用材,倍体毛杨被广泛地用于制纸,而是木质素最要来源所以论文以杨木木质素AL和杨木乙醇溶剂木质素OL原料,通过素析高发热红外谱凝胶色谱定31P-NMR等对结构了面的表征通过TG-FTIR析探究了热失特性,并揭示了热失过程中挥发份的释放规律通过Py-GC/MS手段研究了闪热解特性,并对热解产物了类,对产物的生规律了总结在卧式密热解体系中研究了热解特性,探讨了相产物气体液体生物和固体焦炭的生规律是第次对杨木AL和OL面系统地研究为了更好地解释木质素的热解过程产物的形规律,所以采用木质素模型物了模拟析采用木质素单体模型物对香豆酸阿魏酸和芥子酸模拟了热解过程中热解产物的次降解,讨论了代和芳香在热解过程中的合并筛选出聚香素作木质素5-5’联苯型聚体模型物,探讨了在热解过程中5-5’联苯键的,结焦结的关系采用愈疮木甘--愈疮木作木质素-O-4型聚体模型物,模拟了木质素结构中键的降解,探讨了降解产物的续对述类木质素模型物热解的研究覆盖了木质素中种最要的接类型5-5’接键和-O-4接键,包罗了热解过程中的次和次,很好地模拟了木质素大子的热解更多还原

【Abstract】 Lignin widely exists in the lignocellulosic biomass. It has the dual properties of the aromatic and the aliphatic, and can be used with modification. Compared to carbohydrates, lignin has the higher calorific value and can replace fossil energy to a certain extent as a renewable energy, which could effectively reduce carbon emission and reduce pollution. In the conversion and utilization of lignin, pyrolysis is an effective and industrial promising method. It can converte lignin into gas, bio-oil and char. Bio-oil obtained from pyrolysis can be further upgraded to liquid fuels and value-added bio-chemicals.As an excellent short-cycle paper timber, Populus tomentosa Carr. is widely used in the pulp and paper industry, which is the most important source of industrial lignin. So in this paper, alkali lignin(AL) and ethanol organosolv lignin(OL) isolated from Populus tomentosa Carr. were selected as raw materials. Elemental analysis, higher heating value(HHV), FT-IR spectroscopy, gel permeation chromatography(GPC), and quantitative 31P-NMR were used for the structure characterization. The thermogravimetric characteristics and the releasing laws of the volatiles were analysed on Thermogravimetric Fourier transform infrared(TG-FTIR). Pyrolysis coupled with gas chromatograph–mass spectrometer(Py-GC/MS) was employed to study the flash pyrolysis characteristics. Products obtained from flash pyrolysis were classified, and the formation laws of some products were summaried. Furthermore, a horizontal closed pyrolysis system was built to investigate the pyrolysis characteristics of AL and OL. The composition and the formation rules of the three-phase product(gas, bio-oil and char) were discussed. This is the first time to study of the pyrolysis characteristics of AL and OL comprehensively and systematically.In order to explain the lignin pyrolysis process and the formation laws of the pyrolyic products further, lignin model compounds were chosen to simulate the pyrolysis process. Lignin monomeric model compounds(p-coumaric acid, ferulic acid and sinapic acid) were selected as the primary products to simulate the secondary pyrolysis. Moreover, changes on the substituents and aromatic nucleus in the pyrolysis process were discussed. Dehydrovanillin was synthesized and screened as the 5-5’ biphenyl lignin dimer model compound to discuss the changes on the 5-5’ biphenyl linkage and the relationship with coke formation during pyrolysis. Guaiacylglycerol--guaiacyl ether was used as-O-4 lignin dimer model compound to simulate the degradation of-ether bond in lignin. In addition, the subsequent degradation processes of the pyrolytic products were discussed. Owing to involving the two major connection types(5-5’ biphenyl linkage and-O-4 linkage) in lignin and covering the primary and secondary reactions in the pyrolysis process, the above three types of lignin model compounds could simulate the lignin pyrolysis process well.更多还原