In this work, studies of the transesterification using sodium hydroxide as a catalyst of mixtures of soybean oil/coconut oil (SO/CNO) and soybean oil/castor oil (SO/CO) before and after interesterification (in the presence of potassium methoxide as a catalyst) are presented. To the best of our knowledge, studies comparing raw materials from different sources to the same fatty acid composition have not been carried out. The results point out that the SO/CNO transesterification of mixtures, before and after interesterification, results in a slight difference in the profile of alcoholysis; i.e., if the fatty acid composition is known, it is possible to envisage the kinetic behavior of the reaction, at least for triacylglycerols of oils or fats with an usual fatty acid composition. On the other hand, in the case of the presence of castor oil, transesterification also occurs during interesterification, with the ricinoleate moiety acting as a transesterification agent as a result of the presence of the hydroxyl group at C12. Therefore, the formation of estolides that exhibit high viscosity is observed, and from ¹³C nuclear magnetic resonance, it is possible to estimate the degree of esterification of the C12–OH group (90% for the SO/CO mixture and approximately 70% for neat CO). As a result of this fact, the relative rate of transesterification of the interesterified SO/CO mixture is lower than that of the physical mixture.

中文翻译：

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酯交换和酯交换的研究：具有相同脂肪酸组成的不同油及其反应行为

在这项工作中，研究在酯交换作用之前和之后（在甲醇钾存在下）使用氢氧化钠作为大豆油/椰子油（SO / CNO）和大豆油/蓖麻油（SO / CO）的混合物的催化剂进行酯交换反应的研究。催化剂）。据我们所知，尚未进行将不同来源的原料与相同脂肪酸组成进行比较的研究。结果指出，在酯交换前后，混合物的SO / CNO酯交换反应会导致醇解特性略有不同。即，如果脂肪酸组成是已知的，则至少对于具有通常脂肪酸组成的油脂的三酰基甘油，可以设想反应的动力学行为。另一方面，在存在蓖麻油的情况下，酯交换过程中也会发生酯交换反应，由于C12上存在羟基，蓖麻油酸酯部分用作酯交换剂。因此，观察到形成具有高粘度的雌二醇，并且从^在13 C核磁共振中，可以估计C12–OH基团的酯化程度（SO / CO混合物为90％，纯净CO为约70％）。由于这一事实，酯交换的SO / CO混合物的相对酯交换反应的相对速率低于物理混合物的相对酯交换速率。