Lignin-first biorefinery is a novel concept, which was developed recently with great potential. This paper addresses two important issues in the lignin-first biorefinery: catalyst regenerability and lignin depolymerized product application. It was found that SiC is an effective and regenerable catalyst support, and the catalytic performance of Ru/SiC is comparable to the state-of-the-art results obtained from Ru/C used in the lignin-first biorefinery under identical conditions. Furthermore, the Ru/SiC catalyst can be regenerated by calcination without decrease in the catalytic performance. The resulting lignin oil from Ru/SiC catalyzed lignin depolymerization was then extracted by hexane, which is an optimized solvent for lignin oil upgradation based on model compound screening, and around 50 wt% of the hexane extract was obtained. The hexane extract was converted into aromatic hydrocarbons by ambient pressure hydrodeoxygenation over MoO₃ catalyst. With a 15% blend of the resulting aromatic hydrocarbons, the jet fuel from the hydroprocessed ester and fatty acid (HEFA) meets the density requirements of the ASTM 7566 standard without compromising other required properties. The residue from hexane extraction was successfully used for preparation of rigid polyurethane foam (RPF) as an alternative to polyols of up to 50 wt%. The lignin based RPF not only reduced the use of fossil derived polyols, but also resulted in better water and flame resistance based on tentative LOI assessments. A biorefinery system was then proposed based on the technology developed in the present study.

中文翻译：

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木质素首家生物精炼厂：木质素解聚和木质素油用于喷气燃料芳烃和聚氨酯原料的可重复使用催化剂†

木质素优先生物精炼厂是一个新颖的概念，最近被开发出来，具有很大的潜力。本文讨论了木质素优先生物精炼厂中的两个重要问题：催化剂的可再生性和木质素解聚产品的应用。发现SiC是有效且可再生的催化剂载体，并且Ru / SiC的催化性能与在相同条件下从木质素优先生物精炼厂中使用的Ru / C获得的最新结果相当。此外，Ru / SiC催化剂可以通过煅烧再生而不会降低催化性能。然后通过己烷萃取Ru / SiC催化的木质素解聚得到的木质素油，己烷是一种基于模型化合物筛选的木质素油升华的优化溶剂，并获得约50 wt％的己烷萃取物。₃催化剂。混合15％的芳烃后，加氢处理的酯和脂肪酸（HEFA）制成的喷气燃料可满足ASTM 7566标准的密度要求，而不会影响其他所需的性能。来自己烷萃取的残留物已成功用于制备硬质聚氨酯泡沫塑料（RPF），以替代高达50 wt％的多元醇。基于木质素的RPF不仅减少了化石衍生的多元醇的使用，而且根据初步的LOI评估还提高了耐水和阻燃性。然后根据本研究开发的技术提出了一种生物精炼系统。