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Thermodynamic selection of effective additives to improve the cloud point of biodiesel fuels

机译:有效添加剂的热力学选择,以改善生物柴油燃料的浊点

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We assessed a simple thermodynamic model, with the aim of identifying biodiesel fuel cloud point (CP) improving additives, by predicting the CP values of fatty acid methyl esters with additives. The results showed that the molar mass of the additive has a significant effect in terms of improving the CP; the melting point and fusion enthalpy of the additive, however, produce lesser effects. On the basis of these results, we selected the additives tert-butyl alcohol, 2-butanol, cineol, 2-decanol, 2-decanone and oleyl alcohol, and examined their effects on the CP of a model biodiesel fuel (a methyl oleate and methyl palmitate mixture). The same trials were carried out using fatty acid methyl ester mixtures derived from commercial cooking oils. As predicted, the selected test additives decreased the sample CP values, with the optimum reduction obtained when using 10 wt.% of the additive. The results demonstrate that additives capable of improving the CP can be readily screened using a simple thermodynamic model. (C) 2015 Elsevier Ltd. All rights reserved.
机译:我们评估了一个简单的热力学模型,目的是通过预测带有添加剂的脂肪酸甲酯的CP值,从而识别出改善添加剂的生物柴油燃料浊点(CP)。结果表明,添加剂的摩尔质量在改善CP方面具有显著作用。然而,添加剂的熔点和熔融焓产生的作用较小。根据这些结果,我们选择了叔丁醇,2-丁醇,二烯酚,2-癸醇,2-癸烷和油醇作为添加剂,并研究了它们对模型生物柴油燃料(油酸甲酯和棕榈酸甲酯混合物)。使用衍生自商业食用油的脂肪酸甲酯混合物进行了相同的试验。如所预测的,所选的测试添加剂降低了样品的CP值,当使用10 wt。%的添加剂时获得了最佳的降低。结果表明,可以使用简单的热力学模型轻松筛选能够改善CP的添加剂。 (C)2015 Elsevier Ltd.保留所有权利。

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