Usino David O, Ylitervo Päivi, Richards Tobias
Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden.
Molecules. 2023 Sep 26;28(19):6809. doi: 10.3390/molecules28196809.
Co-pyrolysis is one possible method to handle different biomass leftovers. The success of the implementation depends on several factors, of which the quality of the produced bio-oil is of the highest importance, together with the throughput and constraints of the feedstock. In this study, the fast co-pyrolysis of palm kernel shell (PKS) and woody biomass was conducted in a micro-pyrolyser connected to a Gas Chromatograph-Mass Spectrometer/Flame Ionisation Detector (GC-MS/FID) at 600 °C and 5 s. Different blend ratios were studied to reveal interactions on the primary products formed from the co-pyrolysis, specifically PKS and two woody biomasses. A comparison of the experimental and predicted yields showed that the co-pyrolysis of the binary blends in equal proportions, PKS with mahogany (MAH) or iroko (IRO) sawdust, resulted in a decrease in the relative yield of the phenols by 19%, while HAA was promoted by 43% for the PKS:IRO-1:1 pyrolysis blend, and the saccharides were strongly inhibited for the PKS:MAH-1:1 pyrolysis blend. However, no difference was observed in the yields for the different groups of compounds when the two woody biomasses (MAH:IRO-1:1) were co-pyrolysed. In contrast to the binary blend, the pyrolysis of the ternary blends showed that the yield of the saccharides was promoted to a large extent, while the acids were inhibited for the PKS:MAH:IRO-1:1:1 pyrolysis blend. However, the relative yield of the saccharides was inhibited to a large extent for the PKS:MAH:IRO-1:2:2 pyrolysis blend, while no major difference was observed in the yields across the different groups of compounds when PKS and the woody biomass were blended in equal amounts and pyrolysed (PKS:MAH:IRO-2:1:1). This study showed evidence of a synergistic interaction when co-pyrolysing different biomasses. It also shows that it is possible to enhance the production of a valuable group of compounds with the right biomass composition and blend ratio.
共热解是处理不同生物质残渣的一种可行方法。该方法实施的成功与否取决于几个因素，其中所生产生物油的质量最为重要，同时还包括原料的产量和限制条件。在本研究中，棕榈壳（PKS）和木质生物质的快速共热解在连接气相色谱-质谱仪/火焰离子化检测器（GC-MS/FID）的微型热解器中于600℃和5秒的条件下进行。研究了不同的混合比例，以揭示共热解形成的初级产物之间的相互作用，特别是PKS与两种木质生物质之间的相互作用。实验产率与预测产率的比较表明，等比例的二元混合物（PKS与桃花心木（MAH）或绿柄桑（IRO）锯末）共热解时，酚类的相对产率降低了19%，而对于PKS:IRO-1:1热解混合物，HAA的产率提高了43%，并且对于PKS:MAH-1:1热解混合物，糖类受到强烈抑制。然而，当两种木质生物质（MAH:IRO-1:1）共热解时，不同化合物组的产率未观察到差异。与二元混合物不同，三元混合物的热解表明，对于PKS:MAH:IRO-1:1:1热解混合物，糖类的产率在很大程度上得到提高，而酸类受到抑制。然而，对于PKS:MAH:IRO-1:2:2热解混合物，糖类的相对产率在很大程度上受到抑制，而当PKS与木质生物质等量混合并热解（PKS:MAH:IRO-2:1:1）时，不同化合物组的产率未观察到重大差异。本研究证明了不同生物质共热解时存在协同相互作用。研究还表明，通过合适的生物质组成和混合比例可以提高有价值化合物组的产量。
