Khuenkaeo Nattawut, MacQueen Blake, Onsree Thossaporn, Daiya Sangu, Tippayawong Nakorn, Lauterbach Jochen
Department of Mechanical Engineering, Chiang Mai University Chiang Mai 50200 Thailand
Department of Chemical Engineering, University of South Carolina Columbia 29201 USA.
RSC Adv. 2020 Sep 22;10(58):34986-34995. doi: 10.1039/d0ra06014c. eCollection 2020 Sep 21.
Fast pyrolysis, in combination with torrefaction pretreatment, was used to convert tobacco residues to value-added bio-fuels and chemicals. Tobacco plant residues were torrefied at 220, 260, and 300 °C, before being pyrolyzed at 450, 500, 550, and 600 °C in a rotating blade ablative reactor under vacuum conditions to test the effects on product yields. With torrefaction, tobacco residues thermally decomposed 20-25% w/w at low temperatures. Torrefaction and pyrolysis temperatures were found to markedly affect pyrolytic product yields of bio-chars and bio-oils, while having no effect on gas-phase products. Bio-oil yields exhibited a direct relation with pyrolysis temperature and an inverse relation with torrefaction temperature. Bio-oils produced were separated into light and heavy oils and analyzed by GC-MS, and H and C NMR. Nicotine was found to be the main compound in the light and heavy oils along with several phenols and cresols in the heavy oil.
快速热解结合烘焙预处理，被用于将烟草残渣转化为增值生物燃料和化学品。烟草植物残渣在220、260和300℃下进行烘焙，然后在真空条件下于旋转叶片烧蚀反应器中在450、500、550和600℃下进行热解，以测试对产物产率的影响。通过烘焙，烟草残渣在低温下热分解20 - 25%（重量/重量）。发现烘焙温度和热解温度对生物炭和生物油的热解产物产率有显著影响，而对气相产物没有影响。生物油产率与热解温度呈正相关，与烘焙温度呈负相关。所产生的生物油被分离为轻油和重油，并通过气相色谱 - 质谱联用仪（GC - MS）以及氢核磁共振（H NMR）和碳核磁共振（C NMR）进行分析。发现尼古丁是轻油和重油中的主要化合物，重油中还含有几种酚类和甲酚。
