Phase equilibrium of transesterification reaction system between soybean oil and methanol

被引：0

作者：

Zhang J. ^{[1
]}

Liu H. ^{[1
]}

机构：

[1] Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing

来源：

Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 05期

关键词：

Biodiesel; Fatty acid methyl esters; Glycerol; Methanol; Phase equilibrium; Soybean oil; Transesterification;

D O I：

10.11949/0438-1157.20211791

中图分类号：

学科分类号：

摘要：

Biodiesel is a clean and renewable liquid fuel that is readily made from vegetable oils. Transesterification of the refined vegetable oils with methanol is an important reaction for the production of biodiesel. In order to accurately calculate the multicomponent-phase equilibrium compositions in the transesterification reactions, the multicomponent-phase equilibria of the transesterification reaction between soybean oil and methanol at atmospheric pressure and 60℃ were studied. The transesterification of triolein with methanol was particularly taken as a model reaction, and the UNIFAC and modified UNIFAC activity coefficient models were used to predict the ternary and quaternary phase equilibrium compositions. The results showed that in the region that the overall composition deviates from the binary composition of methanol-methyl esters, the UNIFAC and modified UNIFAC models accurately provided the ternary and quaternary phase equilibrium compositions in the transesterification reaction system. At the glycerol contents greater than 2.2%(mass) or the conversions lower than 90%(mass), using the UNIFAC model, the phase equilibrium compositions for the reaction process were accurately calculated with a deviation of about 2% compared to the experimental values. Both the experimental and modeled values showed that the continuous countercurrent separation of glycerol can improve the methanol to oil ratios and facilitate the mass transfer and transesterification rates. These results provide a theoretical reference for biodiesel process simulation, equipment optimization and new technology development. © 2022, Editorial Board of CIESC Journal. All right reserved.

引用

页码：1920 / 1929

页数：9

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