Abstract The production of bio-oil and bio-char by fast pyrolysis and hydrothermal liquefaction of Enteromorpha clathrata, rice husk and their mixtures have been compared. The results indicated that hydrothermal liquefaction produced higher yield of bio-oil and lower yield of bio-char for the same raw samples. There were more macromolecules (hexadecanoic acid, cyclopenten and esters), small-molecule hydrocarbons and N-containing compounds in hydrothermal liquefaction bio-oil, while more aromatic substances were observed in fast pyrolysis bio-oils. There was significant difference between E. clathrata bio-oils from these two thermochemical methods C O, CH/CH2/CH3 and N H functional groups in E. clathrata bio-oil from hydrothermal liquefaction showed stronger absorption strength than bio-oil from fast pyrolysis. However, the only difference between rice husk bio-oil from hydrothermal liquefaction and fast pyrolysis was aromatic ring signal in Fourier transform infrared spectroscopy curves. In addition, synergistic effect was investigated during the co-pyrolysis and co-hydrothermal processes. Such synergistic effect led to the improvement recorded in the bio-oil quality by deoxidation reaction to increase the H/C ratio in bio-oil from co-pyrolysis of E. clathrata/rice husk blends, and reduces the O/C ratio in bio-oil from co-hydrothermal process, and also enhances the calorie value of bio-oil. The synergistic effect, however, lowered the co-pyrolysis and co-hydrothermal bio-oils yields. Moreover, the addition of rice husk into E. clathrata promoted the bio-oil conversion efficiency of protein and increased the content of aromatic substances.

中文翻译：

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海藻和稻壳的共热解和共水热液化：提高生物燃料生产的比较研究

摘要 比较了浒苔、稻壳及其混合物的快速热解和水热液化生产生物油和生物炭。结果表明，对于相同的原始样品，水热液化产生的生物油产量更高，生物炭产量更低。水热液化生物油中的大分子（十六酸、环戊烯和酯类）、小分子烃类和含氮化合物较多，而快速热解生物油中的芳香族物质较多。两种热化学方法得到的E. clathrata生物油之间存在显着差异，水热液化得到的E. clathrata生物油中的CO、CH/CH2/CH3和NH官能团比快速热解得到的生物油具有更强的吸收强度。然而，水热液化和快速热解得到的稻壳生物油的唯一区别是傅里叶变换红外光谱曲线中的芳环信号。此外，在共热解和共水热过程中研究了协同效应。这种协同效应导致通过脱氧反应提高生物油质量，提高 E. clathrata/稻壳混合物共热解生物油中的 H/C 比，并降低生物油中的 O/C 比。 -来自共水热过程的油，还提高了生物油的卡路里值。然而，协同效应降低了共热解和共水热生物油的产量。此外，在 E. clathrata 中添加稻壳促进了蛋白质的生物油转化效率并增加了芳香物质的含量。