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Effect of the Formation of Diglycerides/Monoglycerides on the Kinetic Curve in Oil Transesterification with Methanol Catalyzed by Calcium Oxide
ACS Omega ( IF 3.7 ) Pub Date : 2020-02-24 , DOI: 10.1021/acsomega.9b04431 Xiaobing Chen , Zhenhua Li , Yuan Chun 1 , Fan Yang , Haocheng Xu , Xingcai Wu 1
ACS Omega ( IF 3.7 ) Pub Date : 2020-02-24 , DOI: 10.1021/acsomega.9b04431 Xiaobing Chen , Zhenhua Li , Yuan Chun 1 , Fan Yang , Haocheng Xu , Xingcai Wu 1
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Many researchers reported that a sigmoid kinetic curve was obtained in oil transesterification with methanol catalyzed by CaO and gave different explanations for this formation. In this paper, heterogeneously catalyzed transesterification of soybean oil with methanol using CaO has been investigated. The solid catalyst and the liquid reaction mixture under different reaction time periods were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and high-performance liquid chromatography (HPLC) to reveal the formation of an S-shape kinetic curve. The appearance of calcium hydroxide, calcium methoxide, calcium glyceroxide, fatty acid calcium, diglycerides, and monoglycerides and their contributions to the kinetic curve have been discussed. The low reaction rate in the induction period can be attributed to mass transfer in this three-phase system. However, the formation of surfactants, diglycerides and monoglycerides, promotes the emulsification of the reaction mixture and numerous emulsion reactors are generated. These emulsion reactors can improve the contact of the solid catalyst with the reactants and thus accelerate the reaction.
中文翻译：
甘油二酸酯/甘油单酸酯的形成对氧化钙催化甲醇酯交换油动力学曲线的影响
许多研究人员报告说，在CaO催化的甲醇与油的酯交换反应中，获得了S型动力学曲线，并对此形成了不同的解释。本文研究了使用CaO对大豆油与甲醇的非均相催化酯交换反应。通过X射线衍射（XRD），傅立叶变换红外光谱（FT-IR）和高效液相色谱（HPLC）对不同反应时间下的固体催化剂和液体反应混合物进行了表征。形动力学曲线。讨论了氢氧化钙，甲醇钙，甘油氧化钙，脂肪酸钙，甘油二酸酯和甘油单酸酯的外观及其对动力学曲线的贡献。诱导期中的低反应速率可归因于该三相系统中的传质。然而，表面活性剂，甘油二酸酯和甘油单酸酯的形成促进了反应混合物的乳化，并且产生了许多乳液反应器。这些乳液反应器可以改善固体催化剂与反应物的接触，从而加速反应。
更新日期：2020-03-10
中文翻译：
甘油二酸酯/甘油单酸酯的形成对氧化钙催化甲醇酯交换油动力学曲线的影响
许多研究人员报告说，在CaO催化的甲醇与油的酯交换反应中，获得了S型动力学曲线，并对此形成了不同的解释。本文研究了使用CaO对大豆油与甲醇的非均相催化酯交换反应。通过X射线衍射（XRD），傅立叶变换红外光谱（FT-IR）和高效液相色谱（HPLC）对不同反应时间下的固体催化剂和液体反应混合物进行了表征。形动力学曲线。讨论了氢氧化钙，甲醇钙，甘油氧化钙，脂肪酸钙，甘油二酸酯和甘油单酸酯的外观及其对动力学曲线的贡献。诱导期中的低反应速率可归因于该三相系统中的传质。然而，表面活性剂，甘油二酸酯和甘油单酸酯的形成促进了反应混合物的乳化，并且产生了许多乳液反应器。这些乳液反应器可以改善固体催化剂与反应物的接触，从而加速反应。
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