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Vapor pressure and normal boiling point predictions for pure methyl esters and biodiesel fuels

机译：纯甲酯和生物柴油燃料的蒸气压和正常沸点预测

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Temperature dependent vapor pressures of the methyl esters of fourteen fatty acids that are commonly present in biodiesel fuels were predicted by the Antoine equation and a group contribution method. The predicted boiling points of these esters up to a pressure of 100 mmHg were within + - 1.0 percent of reported data for these two methods. Normal boiling points were determined from both the predicted vapor pressure and a correlation equation and the prediction errors were less than 5 K comparing to available published data. The vapor pressure and normal boiling points of 19 real-world biodiesel fuels were predicted and compared with reported data where available. The prediction errors of normal boiling points were less than 1.0 percent. and the predicted vapor pressures were also observed to closely match the reported data among the methyl esters of soybean oil, rapeseed oil and tallow. The predicted results showed that, except for coconut and butterfat, most of the methyl esters of the vegetable oils and animal fats had a normal boiling point in the range of 620-630 K. A sensitivity analysis indicated that the variation of fatty acid composition and the uncertainty of the normal boiling point of C 18:2 were the main factors that affected the predicted normal boiling points of the biodiesel fuels.
机译：通过Antoine方程和基团贡献法预测了生物柴油燃料中通常存在的十四种脂肪酸的甲酯的温度依赖性蒸气压。这些酯的预测沸点最高可达100 mmHg，在这两种方法的报告数据的+/- 1.0％之内。从预测的蒸气压和相关方程确定了正常的沸点，并且与可用的公开数据相比，预测误差小于5K。预测了19种现实世界中生物柴油燃料的蒸气压和正常沸点，并与可获得的报道数据进行了比较。正常沸点的预测误差小于1.0％。观察到的预测蒸气压也与大豆油，菜籽油和牛脂的甲酯之间的报道数据非常吻合。预测结果表明，除椰子油和黄油外，大多数植物油和动物脂肪的甲酯的沸点都在620-630 K范围内。敏感性分析表明，脂肪酸组成和C 18：2正常沸点的不确定性是影响生物柴油燃料预测正常沸点的主要因素。

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