Abstract Lignin-first is a strategy for producing value-added phenolics and high-quality bio-oils from lignin. To contribute to this strategy, we investigated the effects of ultrasound acoustic cavitation on depolymerization of organosolv lignin to phenolic monomers and low molecular weight lignin bio-oils. We achieved the highest lignin bio-oil yield of 56.9 wt% at a temperature of 250 °C, a reaction time of 6 h, and an ultrasonic power of 90 W. Moreover, the obtained lignin bio-oils had low molecular weight, narrow molecular weight distribution and lack of ether linkages, which are the characteristics suitable as a source of liquid bio-oil fuels. Finally, the prominent phenolic monomers in liquid bio-oil, including phenol, 2-(1-methylethyl)-phenol and benzene, 1,2,3-trimethoxy-5-methyl, were identified in lignin bio-oil.

中文翻译：

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超声空化增强有机溶剂木质素解聚为酚类单体和低分子量木质素生物油

摘要 木质素优先是一种从木质素中生产高附加值酚类和优质生物油的策略。为了促成这一策略，我们研究了超声空化对有机溶剂木质素解聚为酚类单体和低分子量木质素生物油的影响。我们在 250 °C 的温度、6 h 的反应时间和 90 W 的超声功率下实现了最高的木质素生物油收率 56.9 wt%。 此外，获得的木质素生物油具有低分子量、窄分子量分布和缺乏醚键，这是适合作为液体生物油燃料来源的特性。最后，在木质素生物油中鉴定了液体生物油中的主要酚类单体，包括苯酚、2-(1-甲基乙基)-苯酚和苯、1,2,3-三甲氧基-5-甲基。