Speed of sound measurements of binary n-octane+ ethylcyclohexane mixture at liquid-gas phase transition curve

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2024-10-09 DOI:10.1016/j.fluid.2024.114248

Eugene G. Pashuk , Jiangtao Wu , Ilmutdin M. Abdulagatov

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引用次数: 0

Abstract

Bio-jet fuel is a key element in the aviation industry to reduce operating costs and environmental impacts. Bio-jet fuel is a complex mixture of four hydrocarbons (n-alkanes, isoalkanes, cycloalkanes and aromatics). In the present work, the speed of sound in pure n-octane, ethylcyclohexane, and their mixtures with six selected compositions of (0.3004, 0.4191, 0.4999, 0.5538, 0.6991, and 0.7852 mole fraction of ethylcyclohexane) has been measured along the l-G saturation curve in the temperature ranges from (286 to 443) K using the pulse method with a constant (acoustic) sounding base. The combined expanded absolute and relative uncertainties (0.95 level of confidence, k = 2) of the temperature, concentration, and speed of sound measurements are estimated to be 20 mK, 0.0006 mole fraction, and 0.2 %, respectively. The measured speed of sound data together with our previous reported density data for the pure component (ethylcyclohexane) and the mixture were used to calculate derived thermodynamic properties, such as isentropic compressibility

k_{S}

and heat capacity ratios

\frac{C_{P}}{C_{V}}

as a function of temperature along the l-G saturation curve for the pure components and the mixture for selected concentration of x = 0.8 mole fraction of ethylcyclohexane. The deviation of the measured speed of sound data for the mixture from the linear additive rule has been determined using the pure component data.

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二元正辛烷+乙基环己烷混合物在液气相变曲线处的声速测量结果

生物喷气燃料是航空业降低运营成本和环境影响的关键因素。生物喷气燃料是四种碳氢化合物（正烷烃、异构烷烃、环烷烃和芳烃）的复杂混合物。在本研究中，采用脉冲法和恒定（声学）探测基，沿着 l-G 饱和曲线测量了纯正辛烷、乙基环己烷和它们的六种混合物（乙基环己烷的摩尔分数分别为 0.3004、0.4191、0.4999、0.5538、0.6991 和 0.7852）的声速，温度范围为（286 至 443）K。温度、浓度和声速测量的绝对和相对不确定度（置信度为 0.95，k = 2）分别为 20 mK、0.0006 摩尔分数和 0.2%。测得的声速数据与我们之前报告的纯组分（乙基环己烷）和混合物的密度数据一起，用于计算推导出的热力学性质，如等熵压缩率 kS 和热容比 CPCV，它们是纯组分和混合物（选定的乙基环己烷浓度 x = 0.8 摩尔分数）沿 l-G 饱和曲线的温度函数。混合物的声速测量数据与线性添加剂规则的偏差是通过纯组分数据确定的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fluid Phase Equilibria 工程技术-工程：化工

CiteScore

5.30

自引率

15.40%

发文量

223

审稿时长

53 days

期刊介绍： Fluid Phase Equilibria publishes high-quality papers dealing with experimental, theoretical, and applied research related to equilibrium and transport properties of fluids, solids, and interfaces. Subjects of interest include physical/phase and chemical equilibria; equilibrium and nonequilibrium thermophysical properties; fundamental thermodynamic relations; and stability. The systems central to the journal include pure substances and mixtures of organic and inorganic materials, including polymers, biochemicals, and surfactants with sufficient characterization of composition and purity for the results to be reproduced. Alloys are of interest only when thermodynamic studies are included, purely material studies will not be considered. In all cases, authors are expected to provide physical or chemical interpretations of the results. Experimental research can include measurements under all conditions of temperature, pressure, and composition, including critical and supercritical. Measurements are to be associated with systems and conditions of fundamental or applied interest, and may not be only a collection of routine data, such as physical property or solubility measurements at limited pressures and temperatures close to ambient, or surfactant studies focussed strictly on micellisation or micelle structure. Papers reporting common data must be accompanied by new physical insights and/or contemporary or new theory or techniques.