甘油酯化反应动力学研究

发布时间：2018-03-15 21:53

本文选题：甘油酯化　切入点：反应动力学　出处：《中国油脂》2017年09期 　论文类型：期刊论文

【摘要】：甘油酯化是高酸值油脂降酸值的有效方法,可用于生物柴油的制备。采用大豆油与油酸的混合物为模型化合物,考察了反应温度对甘油酯化产物分布的影响,建立了甘油酯化二级反应动力学模型,并关联出相关反应的动力学参数速率常数k和反应活化能Ea;通过该模型预测了反应温度、甘油与游离脂肪酸摩尔比和原料油酸值对降酸效果的影响。结果表明:模型值与实验值有较好的一致性;降酸反应对反应温度有较高的依赖性,反应温度越高、甘油与游离脂肪酸摩尔比越大及原料油初始酸值越高,降酸速率越快,降酸反应越彻底。研究结果将有助于揭示甘油酯化反应机理,为甘油酯化反应器的设计提供依据。
[Abstract]:Glycerol esterification is an effective method for reducing acid value of high acid value oils and can be used in the preparation of biodiesel. The effect of reaction temperature on the distribution of glycerol ester products was investigated by using the mixture of soybean oil and oleic acid as model compound. The kinetic model of the second order reaction of glycerol esterification was established, and the kinetic parameter rate constant k and the activation energy of the reaction, EA, were correlated, and the reaction temperature was predicted by the model. The effect of the molar ratio of glycerol to free fatty acid and the acid value of feedstock on the acid reducing effect. The results show that the model value is in good agreement with the experimental value, the acid reduction reaction is highly dependent on the reaction temperature, and the higher the reaction temperature is, the higher the reaction temperature is. The higher the molar ratio of glycerol to free fatty acid and the higher the initial acid value of the feedstock, the faster the acid reduction rate is and the more thorough the acid reduction reaction is. The results will be helpful to reveal the mechanism of glycerol esterification reaction and provide the basis for the design of glycerol esterification reactor.
【作者单位】：浙江工业大学化工学院浙江省生物燃料利用技术研究重点实验室;
【基金】：国家863计划子课题(2014AA022103)
【分类号】：TE667

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