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Thermodynamics of semicontinuous n-alcohol/ultra-low sulfur diesel blends

机译:半连续正构醇/超低硫柴油混合物的热力学

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摘要

Two methods for calculating activity coefficients of ultra-low sulfur diesel (ULSD) and its blends with pure alcohols (C1-C5), namely, UNIFAC-continuous and UNIFAC-Dortmund-continuous, are presented. ULSD was modeled as a continuous blend of paraffins, naphthenes, and aromatics. The molar distribution in each family was expressed as a function of carbon number using the gamma distribution function. The parameters of the distribution function can be easily fitted from experimental distillation data of ULSD and extrapolated to n-alcohol/ULSD blends. The activity coefficients obtained were used to model the ASTM D86 distillation curves. UNIFAC-Dortmund-continuous exhibited the best fitting to the experimental results. Based on that, three new correlations for calculating the boiling point, vapor pressure and structural groups of complex ULSD are proposed here. (C) 2015 Elsevier B.V. All rights reserved.
机译:提出了两种计算超低硫柴油(ULSD)及其与纯醇(C1-C5)混合的活性系数的方法,即UNIFAC-连续和UNIFAC-Dortmund-连续。 ULSD被建模为石蜡,环烷烃和芳烃的连续混合物。使用γ分布函数,将每个家族中的摩尔分布表示为碳数的函数。分布函数的参数可以很容易地从ULSD的实验蒸馏数据中拟合出来,并外推到n-醇/ ULSD混合物中。获得的活度系数用于模拟ASTM D86蒸馏曲线。 UNIFAC-Dortmund-continuous表现出与实验结果最佳的拟合。基于此,本文提出了三种新的关联关系,用于计算复杂的ULSD的沸点,蒸气压和结构基团。 (C)2015 Elsevier B.V.保留所有权利。

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