The objective of this study was to evaluate the ethyl esters (EE) production obtained with waste oil (WO) and crambe oil (CO) blends using supercritical ethanol. Experiments were carried out to evaluate the effect of temperature, residence time and water concentration (in the ethanol) on the EE yield. Reactions were also conducted with pure oils for comparison purposes. The results show that an increase in temperature and residence time favors the production of esters; however, with an increase in decomposition. The EE yields obtained followed the order CO>blend 25/75 (WO/CO)>blend 50/50 (WO/CO)>WO. It was found that the degree of decomposition is related to the content of polyunsaturated fatty acids. The addition of water to the ethanol promoted an increase in the EE yield in the initial reaction time, but from 30 min the observed effect was minimal. Ethyl linoleate and linolenate underwent degradation under the applied operating conditions. Therefore, the blend with 25/75 (WO/OC) and the addition of 5 wt% of water provided a better yield, with ∼70 % esters at 300 °C and ∼10 wt% unreacted compounds.

这项研究的目的是评估使用超临界乙醇与废油（WO）和克拉姆贝油（CO）混合物制得的乙酯（EE）的产量。进行实验以评估温度，停留时间和水浓度（乙醇中）对EE收率的影响。为了比较目的，还用纯油进行了反应。结果表明，温度和停留时间的增加有利于酯的生产。但是，随着分解的增加。所获得的EE产率遵循CO＞混合25/75（WO / CO）＞混合50/50（WO / CO）＞ WO的顺序。发现分解程度与多不饱和脂肪酸的含量有关。在乙醇中添加水可在初始反应时间内提高EE收率，但从30分钟起，观察到的影响很小。亚油酸乙酯和亚油酸乙酯在所应用的操作条件下经历降解。因此，与25/75（WO / OC）的共混物和添加5 wt％的水可提供更好的收率，在300°C时有约70％的酯和约10 wt％的未反应化合物。