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Thermal treatment of lignin, cellulose and hemicellulose in nitrogen and carbon dioxide

机译：氮气和二氧化碳中木质素，纤维素和半纤维素的热处理

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The paper explores the primary products from fast pyrolysis of biomass components: Lignin, Cellulose and Hemicellulose (Xylan). A heated strip reactor is employed at temperatures of 1573 K and 2073 K with N-2 and CO2 atmospheres. Volatiles quench immediately after volatilization on a cold pyrex bridge, while char remains on the heated strip for 3 s. Tar, soot and char are collected and subject to chemical treatments and analyses, including gas chromatography-mass spectrometry and Size Exclusion Chromatography, Thermogravimetric analysis, Raman spectroscopy and Scanning Electron Microscopy.Fast pyrolysis of Lignin produces "Light tar" (soluble in acetone) and "Heavy tar" (soluble in NMP), char, a minor fraction of soot. The "Light tar" contains Vanillin, which can be considered the main primary depolymerization product, but also aliphatics and PAHs. Higher temperature enhances "Heavy tar" and graphitization of the char.Cellulose at 1573 K produces only "Light tar", largely made of Levoglucosan, as the result of depolymerization. At higher temperature the tar becomes heavier. Hemicellulose has a peculiar behavior: it produces a "Light tar" which is chemically similar to that of Cellulose and, at high temperature also "Heavy tar". Hemicellulose pyrolysis results also in the production of an atypical solid residue: swollen ad spongy at lower temperature, bright and glassy at higher temperature.CO2 affects the pyrolysis products, particularly those of Lignin, promoting tar cracking and oxygenation already at the stage of primary pyrolysis and hindering thermal annealing and structural ordering of the solid carbonaceous structure.
机译：本文探讨了生物质组分快速热解的主要产品：木质素，纤维素和半纤维素（Xylan）。在1573k和2073k的温度下使用加热的带式反应器，N-2和CO 2常规。在冷热桥上挥发挥发后挥发溶液，而Char保留在加热条上3秒。收集焦油，烟灰和焦炭并受化学处理和分析，包括气相色谱 - 质谱和尺寸排阻色谱，热重分析，拉曼光谱和扫描电子显微镜。木质素的快速解水产生“轻焦油”（可溶于丙酮）和“重焦油”（溶于NMP），炭，烟灰小部分。 “轻焦油”含有香草蛋白，可被认为是主要的原发性解聚产物，也可以考虑龙汗和PAHS。较高的温度增强“重质焦油”和炭的石墨化在1573k下，仅产生“轻焦油”，主要由Levoglucosan作为解聚。在较高温度下，焦油变得更加重大。半纤维素具有特殊的行为：它产生了与纤维素的化学上类似的“轻焦油”，并且在高温下也“重焦油”。半纤维素热解还在生产非典型固体残留物中：较低温度下的溶胀add，较高温度下的玻璃状.co2影响热解产物，特别是木质素的产物，促进初级热解的阶段促进焦油裂解和氧合和妨碍固体碳质结构的热退火和结构排序。

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