This work focuses on the production of biodiesel from wet, lipid-rich algal biomass using a two-step process involving hydrothermal carbonization (HTC) and supercritical in situ transesterification (SC-IST). Algal hydrochars produced by HTC were reacted in supercritical ethanol to determine the effects of reaction temperature, time, ethanol loading, water content, and pressure on the yield of fatty acid ethyl esters (FAEE). Reaction temperatures above 275 °C resulted in substantial thermal decomposition of unsaturated FAEE, thereby reducing yields. At 275 °C, time and ethanol loading had a positive impact on FAEE yield while increasing reaction water content and pressure reduced yields. FAEE yields as high as 79% with a 5:1 ethanol:fatty acid (EtOH:FA) molar ratio (150 min) and 89% with a 20:1 EtOH:FA molar ratio (180 min) were achieved. This work demonstrates that nearly all lipids within algal hydrochars can be converted into biodiesel through SC-IST with only a small excess of alcohol.

译文

这项工作的重点是使用涉及水热碳化 (HTC) 和超临界原位酯交换 (sc-ist) 的两步法从湿的,富含脂质的藻类生物质生产生物柴油。由HTC生产的藻类水渣在超临界乙醇中进行反应,以确定反应温度,时间,乙醇负载量,水含量和压力对脂肪酸乙酯 (FAEE) 产率的影响。高于275 °C的反应温度导致不饱和FAEE的大量热分解,从而降低产率。在275 °C下,时间和乙醇负载对FAEE产率具有积极影响,同时增加反应水含量和降低压力产率。在5:1乙醇: 脂肪酸 (EtOH:FA) 摩尔比 (150分钟) 下达到79%,在20:1 EtOH:FA摩尔比 (180分钟) 下达到89%。这项工作表明,藻类水炭中的几乎所有脂质都可以通过SC-IST转化为生物柴油,而仅需少量过量的酒精。

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