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Effect of the Formation of Diglycerides/Monoglycerides on the Kinetic Curve in Oil Transesterification With Methanol Catalyzed by Calcium Oxide

Effect of the Formation of Diglycerides/Monoglycerides on the Kinetic Curve in Oil Transesterification With Methanol Catalyzed by Calcium Oxide

Xiaobing Chen, Zhenhua Li, Yuan Chun, Fan Yang, Haocheng Xu, Xingcai Wu

ACS Omega. 2020 Feb 24;5(9):4646-4656.

PMID: 32175511

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP2556538	Calcium methoxide		2556-53-8	Price

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