酯化-酯交换两步法制备生物柴油的动力学

以潲水油（WCO）为原料，探讨了酯化-酯交换两步法制备生物柴油的反应动力学。以活性炭负载硫酸铁［Fe₂(SO₄)₃/AC］为负载型催化剂，通过测定不同反应温度、不同甲醇/脂肪酸（FFA）摩尔比条件下WCO中游离脂肪酸的转化率，以此确定酯化反应的动力学控制步骤及动力学方程中的待定参数，从而建立了在实验温度范围内酯化反应的动力学方程，并根据碱催化酯交换反应机理，在简化的动力学模型基础上，推导出了WCO中甘油三酯（TG）与甲醇发生酯交换反应的宏观动力学方程。结果表明，酯化反应和酯交换反应的动力学方程在实验条件范围内都能较好地描述各自的反应过程。

Kinetics of esterification and transesterification for biodiesel production in two-step process

The kinetics of esterification and transesterification for biodiesel production in two-step process from waste cooking oil (WCO) was discussed.Using activated carbon loaded with ferric sulfateFe2(SO4)3 /AC] as a supported catalyst,the controlling step of esterification kinetics and parameters in the kinetic equation were determined by measuring the conversion rate of free fatty acid (FFA) in WCO under the conditions of different reaction temperatures and different methanol/FFA molar ratios, the esterification kinetic equation was established within the range of experimental temperatures.The macro-kinetic equation of triglycerides (TG) transesterification was obtained based on the transesterification mechanism in the existence of alkaline catalyst and the simplified kinetic model of transesterification.The result showed that the kinetic equations of esterification and transesterification can describe their reaction processes very well respectively within the range of the experimental condition.