This work dealt with the extraction of Jatropha oil using methanol and ethanol as solvents to evaluate a potential integration of extraction-transesterification to produce fatty esters. For comparison purposes, additional extractions were carried out with n-hexane as industrial benchmark solvent. The effects of type of solvent, particle size (0.44–3.57 mm), and seed-to-solvent ratio (1:4, 1:6, and 1:8 w/v) were evaluated with respect to oil yield, efficiency, saponification index (SI, mgKOH/g) and acid value (AV, mgKOH/g). As expected, highest oil yield (50.4% wt.) was obtained using n-hexane, but with a low selectivity to saponifiable materials (SI ∼ 166). When using alcohols, oil yield (8–31% wt.) and efficiency (17–70%) were lower and the quality of the oil was poor (SI 32–176; AV 4–5). Results indicated that, differently from previously claimed, integrated alcoholic extraction with alkaline transesterification would not be suitable for fatty esters production. By using experimental data and the Hildebrandt solubility parameters, it was possible to fit a continuous model suitable for further optimization and solvent selection in Jatropha oil extraction. The model was validated by predicting expected SI and oil yield using an untested solvent (i.e. petroleum ether), and difference between model predictions and experimental observations were less than 3%.

这项工作涉及使用甲醇和乙醇作为溶剂提取麻风树油，以评估提取-酯交换生产脂肪酯的潜在整合。为了比较的目的，使用正己烷作为工业基准溶剂进行额外的萃取。评估了溶剂类型、粒径（0.44–3.57 mm）和种子与溶剂比率（1:4、1:6 和 1:8 w/v）对油产量、效率、皂化指数（SI，mgKOH/g）和酸值（AV，mgKOH/g）。正如预期的那样，使用正己烷获得了最高的油收率（50.4% wt.），但对皂化物质的选择性较低（SI ∼ 166）。使用醇时，油产量（8–31% wt.）和效率（17–70%）较低，油的质量较差（SI 32–176；AV 4–5）。结果表明，与之前的说法不同，醇提取与碱性酯交换的结合不适用于脂肪酸酯的生产。通过使用实验数据和希尔德布兰特溶解度参数，可以拟合适合麻风树油提取中进一步优化和溶剂选择的连续模型。通过使用未经测试的溶剂（即石油醚）预测预期的 SI 和石油产量来验证模型，模型预测与实验观察之间的差异小于 3%。