Abstract The aim of the present study is to analyse the transesterification of blend of high free fatty acid FFA) sunflower oil with low free fatty acid algae oil. The high FFA content of sunflower oil is reduced by blending it with low FFA algae oil so that the resultant oil will be converted into biodiesel at low temperature using single-step base-catalyzed transesterification process. The process parameters of transesterification were optimized using response surface methodology (RSM). Box–Behnken experimental design was adopted and the three process parameters considered were methanol to oil percentage (v/v) (20–60%), catalyst concentration (0–2 wt%) and reaction time (60–180 min) at constant temperature of 50 °C. The results of the present work indicate that RSM has good predictability with an optimized biodiesel yield of 95%. The optimum conditions for the reaction were found to be methanol/oil percentage of 60% (v/v), catalyst amount of 1.392% (w/w) for a reaction time of 130 min at a constant temperature of 50 °C. A significant quadratic regression model with a value of R2 of 0.99 was obtained.

中文翻译：

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葵花油海藻油低FFA共混物低温酯交换优化

摘要 本研究的目的是分析高游离脂肪酸（FFA）葵花籽油与低游离脂肪酸海藻油的酯交换反应。向日葵油中的高 FFA 含量通过将其与低 FFA 的海藻油混合来降低，从而使用一步碱催化酯交换工艺将所得油在低温下转化为生物柴油。使用响应面法（RSM）优化酯交换的工艺参数。采用 Box-Behnken 实验设计，考虑的三个工艺参数是甲醇与油的百分比 (v/v) (20–60%)、催化剂浓度 (0–2 wt%) 和恒定反应时间 (60–180 min)温度为 50°C。目前的工作结果表明，RSM 具有良好的可预测性，优化的生物柴油产率为 95%。发现反应的最佳条件是甲醇/油百分比为 60% (v/v)，催化剂用量为 1.392% (w/w)，反应时间为 130 min，恒温 50 °C。获得了 R2 值为 0.99 的显着二次回归模型。