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Evaluating lignin valorization via pyrolysis and vapor-phase hydrodeoxygenation for production of aromatics and alkenes
Green Chemistry ( IF 9.3 ) Pub Date : 2020-03-27 , DOI: 10.1039/c9gc04245h Alireza Saraeian 1, 2, 3, 4, 5 , Alvina Aui 2, 3, 4, 6 , Yu Gao 4, 7, 8, 9, 10 , Mark M. Wright 2, 3, 4, 6 , Marcus Foston 4, 7, 8, 9, 10 , Brent H. Shanks 1, 2, 3, 4, 5
Green Chemistry ( IF 9.3 ) Pub Date : 2020-03-27 , DOI: 10.1039/c9gc04245h Alireza Saraeian 1, 2, 3, 4, 5 , Alvina Aui 2, 3, 4, 6 , Yu Gao 4, 7, 8, 9, 10 , Mark M. Wright 2, 3, 4, 6 , Marcus Foston 4, 7, 8, 9, 10 , Brent H. Shanks 1, 2, 3, 4, 5
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Lignin valorization to chemicals is an important component of creating economically viable biofuels production from lignocellulosic biomass. Any such strategy should aim at producing chemicals used at scales that can appropriately match lignin availability. Herein, a combined pyrolysis and low-pressure hydrodeoxygenation (HDO) process configuration is proposed to achieve total oxygen removal and obtain hydrocarbon (aromatic and alkene) products. This approach is tested for its robustness for lignin feedstocks obtained from a variety of sources and extracted using different procedures. The experimental results demonstrate that regardless of the lignin source, the HDO process using a MoO3 catalyst was able to funnel the complex mixture of pyrolysis vapors to mono-aromatics (17–29 C%), as well as alkenes and alkanes. The formation of char from lignin pyrolysis retains more than 50% of the feed carbon in the pyrolyzer, allowing only a portion of carbon to volatilize and be converted to products. A partial depolymerization technique is employed on one of the lignin samples prior to pyrolysis as an example of how the amount of char can be drastically reduced leading to an increased yield of aromatics (53–55 C%). Techno-economic analysis based on the experimental results suggest significant economic benefit of this strategy compared to using lignin as simply a boiler feed.
中文翻译：
通过热解和气相加氢脱氧评估木质素的增值作用，以生产芳族化合物和烯烃
木质素对化学物质的增值是从木质纤维素生物质创造经济上可行的生物燃料生产的重要组成部分。任何此类策略均应旨在生产能够适当匹配木质素利用率的化学品。在本文中，提出了热解和低压加氢脱氧（HDO）结合的工艺配置，以实现总氧去除并获得碳氢化合物（芳烃和烯烃）产品。测试了该方法对从各种来源获得并使用不同程序提取的木质素原料的耐用性。实验结果表明，无论木质素来源如何，使用MoO 3的HDO工艺催化剂能够将热解蒸气的复杂混合物漏入单芳烃（17–29 C％）以及烯烃和烷烃中。木质素热解形成的焦炭在热解器中保留了进料碳的50％以上，仅使一部分碳挥发并转化为产物。在热解之前，对其中一个木质素样品采用了部分解聚技术，以此为例可以说明如何大幅减少炭量，从而提高芳烃的收率（53-55 C％）。基于实验结果的技术经济分析表明，与仅使用木质素作为锅炉给水相比，该策略具有显着的经济效益。
更新日期：2020-03-27
中文翻译：
通过热解和气相加氢脱氧评估木质素的增值作用，以生产芳族化合物和烯烃
木质素对化学物质的增值是从木质纤维素生物质创造经济上可行的生物燃料生产的重要组成部分。任何此类策略均应旨在生产能够适当匹配木质素利用率的化学品。在本文中，提出了热解和低压加氢脱氧（HDO）结合的工艺配置，以实现总氧去除并获得碳氢化合物（芳烃和烯烃）产品。测试了该方法对从各种来源获得并使用不同程序提取的木质素原料的耐用性。实验结果表明，无论木质素来源如何，使用MoO 3的HDO工艺催化剂能够将热解蒸气的复杂混合物漏入单芳烃（17–29 C％）以及烯烃和烷烃中。木质素热解形成的焦炭在热解器中保留了进料碳的50％以上，仅使一部分碳挥发并转化为产物。在热解之前，对其中一个木质素样品采用了部分解聚技术，以此为例可以说明如何大幅减少炭量，从而提高芳烃的收率（53-55 C％）。基于实验结果的技术经济分析表明，与仅使用木质素作为锅炉给水相比，该策略具有显着的经济效益。
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