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A predictive thermodynamic model for the Brazilian gasoline

机译：巴西汽油的预测热力学模型

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In Brazil, as in many other countries, the fuel quality control is made according to standard assays, which depend on some of the fuel properties, such as specific gravity, Reid vapor pressure and distillation curve. These properties are intimately related to the fuel composition and their prediction relies on the knowledge of its components characteristics. In Brazil, 25 percent (v/v) of anhydrous ethanol is added to the mixture of hydrocarbons that is usually called gasoline, according to the local regulations. In this work, the composition of the gasoline was obtained by gas chromatography as a small series of pseudo-components. Given the gasoline composition, its volatility properties and specific gravity were calculated using the Peng-Robinson equation of state with the Fisher-Gmehling mixing rale. The model provided excellent predictions for specific gravity, Reid vapor pressure and most of the distillation curve. However, important deviations are observed at the end of the distillation curve (90 + percent). These deviations are due to chemical alterations of the fuel caused by the high temperatures occurring at the end of the distillation curve. The model, as proposed, is efficient to forecast the fuel properties; as a consequence, it can be applied as a tool in the study of gasoline formulations and as an alternative tool in quality control.
机译：在巴西，与许多其他国家一样，燃料质量控制是根据标准测定法进行的，该测定法取决于某些燃料特性，例如比重，里德蒸气压和蒸馏曲线。这些特性与燃料成分密切相关，其预测依赖于其组分特性的知识。在巴西，根据当地法规，将25％（v / v）的无水乙醇添加到通常称为汽油的碳氢化合物混合物中。在这项工作中，汽油的组成是通过气相色谱法获得的，是少量伪组分。在给定汽油成分的情况下，使用具有Fisher-Gmehling混合规则的Peng-Robinson状态方程计算其挥发性和比重。该模型为比重，里德蒸气压和大部分蒸馏曲线提供了出色的预测。然而，在蒸馏曲线的末端观察到了重要的偏差（90％）。这些偏差是由于在蒸馏曲线末端发生的高温引起的燃料化学变化所致。所提出的模型可以有效地预测燃料特性。因此，它可以用作研究汽油配方的工具，也可以作为质量控制的替代工具。

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