Abstract A two-stage pyrolysis of wood was conducted to produce a phenol-rich bio-oil. The two-stage pyrolysis process included auger and fluidized bed reactors connected in series. In this study, the effects of temperatures of the auger and fluidized bed reactors and the type of fluidizing medium were mainly investigated. The auger reactor temperature was varied from room temperature to about 290 °C, whereas the fluidized bed reactor temperature ranged from about 500 to 700 °C. As the auger reactor temperature rose from about 20 to 290 °C, the gas yield increased from 27 to 31 wt%. At about 290 °C, the production of phenol was greatly enhanced. A high fluidized bed reactor temperature favored the formation of phenol, efficiently exploiting the weakened bond strength between C (benzene) and methoxy group of lignin molecules caused by heat treatment in the auger reactor. The use of nitrogen as the fluidizing medium drastically increased phenol production, which was achieved by reducing reactions of phenol produced inside the fluidized bed reactor with other components. In the current study, the maximum phenol content in bio-oil reached about 16 wt%. Bio-oil with a high phenol content has good potential as a reactant in the phenol resin synthesis.

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通过木材的两阶段热解生产富含酚的生物油

摘要 对木材进行两阶段热解以生产富含苯酚的生物油。两级热解过程包括串联连接的螺旋钻和流化床反应器。在这项研究中，主要研究了螺旋钻和流化床反应器的温度和流化介质类型的影响。螺旋钻反应器温度从室温变化到约 290°C，而流化床反应器温度范围从约 500 到 700°C。随着螺旋钻反应器温度从约 20°C 上升到 290°C，气体产率从 27 重量％增加到 31 重量％。在290℃左右，苯酚的产量大大提高。高流化床反应器温度有利于苯酚的形成，有效地利用螺旋反应器中热处理引起的木质素分子的 C（苯）和甲氧基之间的键强度减弱。使用氮气作为流化介质大大增加了苯酚的产量，这是通过减少流化床反应器内产生的苯酚与其他组分的反应来实现的。在目前的研究中，生物油中苯酚的最大含量达到了约 16 wt%。苯酚含量高的生物油作为酚醛树脂合成中的反应物具有良好的潜力。