In this study, direct transesterification with a combination of methanol and a cosolvent was demonstrated to be promising for the production of biodiesel from black soldier fly larvae (BSFL) biomass. Of the solvents tested, n-hexane was identified as the most effective cosolvent for the reaction, resulting in a 14.5-fold increase in the biodiesel yield, compared with the reaction without a cosolvent. The direct transesterification using n-hexane as a cosolvent was then optimized to maximize the biodiesel yield. The highest biodiesel yield of 94.14% was achieved at an n-hexane:methanol volume ratio of 1:2 (v/v), a solvent dosage of 12 mL, a catalyst loading of 1.2 mL, a temperature of 120°C, and a reaction time of 90 min. The properties of the BSFL biodiesel were also tested, and most—such as the biodiesel's density (875 kg/m³), water content (0.03 mg/kg), ester content (98.3%), acid value (<0.8 mg KOH/g), viscosity (5.2 mm²/s), flash point (121°C), and cetane index (50)—met the specifications of the European standard EN 14214. This study suggested that direct transesterification using n-hexane as a cosolvent could be a promising method for biodiesel production from BSFL and decrease production costs.

在这项研究中，甲醇与助溶剂的直接酯交换反应被证明对从黑士兵蝇幼虫（BSFL）生物量生产生物柴油很有希望。在测试的溶剂中，正己烷被确定为该反应最有效的助溶剂，与没有助溶剂的反应相比，生物柴油收率提高了14.5倍。然后优化使用正己烷作为助溶剂的直接酯交换反应，以最大程度地提高生物柴油的收率。在正己烷：甲醇体积比为1：2（v / v），溶剂剂量为12 mL，催化剂负载为1.2 mL，温度为120的条件下，获得最高的生物柴油收率94.14％，反应时间为90分钟。还测试了BSFL生物柴油的特性，以及大多数-例如生物柴油的密度（875 kg / m ³），水含量（0.03 mg / kg），酯含量（98.3％），酸值（<0.8 mg KOH / g），粘度（5.2 mm ² / s），闪点（121°C）和十六烷指数（50）-符合欧洲标准EN 14214的规范。这项研究表明，使用正己烷作为助溶剂的直接酯交换反应可能是从BSFL生产生物柴油并降低生产成本的一种有前途的方法。