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首页> 外文期刊>International journal of green energy >Single and Two-Step Homogeneous Catalyzed Transesterification of Waste Cooking Oil: Optimization by Response Surface Methodology
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Single and Two-Step Homogeneous Catalyzed Transesterification of Waste Cooking Oil: Optimization by Response Surface Methodology

机译：废食用油的单步和两步均相催化酯交换反应：通过响应面法进行优化

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摘要

Large number of studies related to alkali and acid catalyzed transesterification of waste cooking oil are widely available, but references for optimization and modeling comparison between single and two-step transesterification are scarce. Therefore, response surface methodology (RSM) has been employed to study the relationship between process variables and predict the optimal conditions. Sulfuric acid and sodium hydroxide were utilized in the pretreatment step and alkali catalyzed transesterification reaction, respectively. The highest free fatty acid (FFA) conversion in the two- and single-step reactions was 93.8% and 82.7%, respectively at the optimal reaction conditions being 1.1 wt% catalyst loading, 6.5:1 methanol to oil ratio, 60 degrees C reaction temperature, and 65 min reaction time.. RSM could accurately predict the optimal FFA conversion in both two-and single-step processes by only 0.3% and 1.01% error, respectively. In addition, the two-step method produced higher fatty acid methyl ester (FAME) yield (86.7%) and also improved the final product quality compared to single-step method with only 73.7% biodiesel yield.
机译：与废食用油的碱和酸催化酯交换反应有关的研究很多，但单步和两步酯交换反应的优化和模型比较的参考文献很少。因此，已采用响应面方法（RSM）来研究过程变量之间的关系并预测最佳条件。在预处理步骤和碱催化的酯交换反应中分别使用硫酸和氢氧化钠。在最佳反应条件为催化剂负载量为1.1 wt％，甲醇与油的比例为6.5：1、60°C反应的最佳反应条件下，两步和单步反应的最高游离脂肪酸（FFA）转化率分别为93.8％和82.7％。 RSM可以准确地预测两步和单步过程中的最佳FFA转化率，误差分别仅为0.3％和1.01％。另外，与仅具有生物柴油产率的73.7％的单步方法相比，两步方法产生了更高的脂肪酸甲酯（FAME）产率（86.7％），并且还改善了最终产品质量。

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