Sarve Antaram, Varma Mahesh N, Sonawane Shriram S
Department of Chemical Engineering, Visvesvaraya National Institute of Technology (VNIT).
J Oleo Sci. 2015;64(9):987-97. doi: 10.5650/jos.ess15069.
In the present study, the low-cost non-edible kusum (Schleichera triguga) oil with a substantial amount of free fatty acid (FFA) was utilized for biodiesel synthesis. In pretreatment step, FFA was reduced by the acid catalyzed esterification method. Then, response surface method (RSM) in conjunction with centre composite design (CCD) containing 30 experimental runs were statistically employed for process optimization and kinetic study for the base catalyzed transesterification process. A statistical model predicted highest fatty acid methyl ester (FAME) yield of 97.37% at the optimal values of process parameters as follows: sodium methoxide concentration 0.9 wt% of oil, Methanol to oil molar ratio 9:1, temperature 58.9 ℃ and reaction time 58.5 min. Using these optimal parameters under experimental conditions in three independent replicates an actual FAME content of 98.14% was obtained which was in reasonable agreement with predicted one. The developed kinetic model suggested a 1.8(th) order reaction with activation energy of 31.42 kcal mol(-1) and frequency factor of 5.53×10(19) L mol(-1)min(-1). Furthermore, Important fuel properties of kusum oil biodiesel (KOB) was compared with ASTM 6751 and DIN EN 14214. The viscosity was found to be 5.34 Cst at 40 °C and the flash point was 152°C.
在本研究中，具有大量游离脂肪酸（FFA）的低成本非食用油库苏姆（Schleichera triguga）油被用于生物柴油合成。在预处理步骤中，通过酸催化酯化法降低FFA。然后，采用响应面法（RSM）结合包含30次实验运行的中心复合设计（CCD）对碱催化酯交换过程进行工艺优化和动力学研究。一个统计模型预测，在以下工艺参数的最佳值下，脂肪酸甲酯（FAME）的最高产率为97.37%：甲醇钠浓度为油的0.9 wt%、甲醇与油的摩尔比为9:1、温度为58.9℃、反应时间为58.5分钟。在实验条件下使用这些最佳参数进行三次独立重复实验，得到的实际FAME含量为98.14%，与预测值合理吻合。所建立的动力学模型表明该反应为1.8级反应，活化能为31.42 kcal mol(-1)，频率因子为5.53×10(19) L mol(-1)min(-1)。此外，还将库苏姆油生物柴油（KOB）的重要燃料特性与ASTM 6751和DIN EN 14214进行了比较。发现其在40℃时的粘度为5.34厘沲，闪点为152℃。
