使用三种校准方法计算噻吩 + 庚烷和噻吩 + 辛烷在开氏 313 至开氏 363 度和高达 25 兆帕压力下的密度和过量摩尔体积

IF 2.2 3区 工程技术 Q3 CHEMISTRY, PHYSICAL
Rubén P. Mendo-Sánchez , Alfredo Pimentel-Rodas , Angel M. Notario-López , Luis A. Galicia-Luna
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引用次数: 0

摘要

报告了噻吩+庚烷和噻吩+辛烷在开氏 313 至 363 度温度范围内的新压缩液体密度 (ρ),压力最高达 25 兆帕。噻吩 (1) + 庚烷 (2) 的成分为 x(1) = 0.1049、0.2471、0.5097、0.7494 和 0.8994,噻吩 (1) + 辛烷 (2) 的成分为 x(1) = 0.1042、0.2530、0.5037、0.7516 和 0.8988。实验系统使用振动管密度计(VTD)和三种校准方法(第一种使用正己烷和水;第二种使用氮气和水;第三种使用水和对振动管密度计施加真空作为校准参考液体)。所报告的密度数据是使用第三种方法确定的,该方法的不确定性最低,估计在温度范围为(313 至 363)K 和压力高达 25 MPa 的情况下,最大相对扩展不确定性 (k=2) 为 0.21%。纯化合物密度是根据 Pimentel-Galicia 模型所代表的先前密度测定结果计算得出的。这种纯化合物的经验相关性被用于过量摩尔体积的计算。本研究中报告的混合物实验数据是根据 Pimentel-Galicia 模型对每种成分进行建模的,偏差不超过 0.07%。成分的综合标准不确定性(考虑到样品的纯度)为 ucx= 0.0026。最后,根据密度数据评估了等温可压缩性和等压热膨胀率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Densities and excess molar volumes of thiophene + heptane and thiophene + octane at temperatures between (313 K and 363) K and pressures up to 25 MPa using three calibration methods

Densities and excess molar volumes of thiophene + heptane and thiophene + octane at temperatures between (313 K and 363) K and pressures up to 25 MPa using three calibration methods

Densities and excess molar volumes of thiophene + heptane and thiophene + octane at temperatures between (313 K and 363) K and pressures up to 25 MPa using three calibration methods

New compressed liquid densities (ρ) of thiophene + heptane and thiophene + octane are reported in the temperature range from (313 to 363) K, with pressure up to 25 MPa. The compositions are x(1) = 0.1049, 0.2471, 0.5097, 0.7494, and 0.8994 for thiophene (1) + heptane (2), and x(1) = 0.1042, 0.2530, 0.5037, 0.7516, and 0.8988 for thiophene (1) + octane (2). The experimental system uses a vibrating tube densimeter (VTD) and three calibration methods (the first uses hexane and water, the second uses nitrogen and water, and the third uses water and applying vacuum to the VTD as calibration reference fluids). The reported density data are determined using the third method, which notifies the lowest uncertainty and estimates a maximum relative expanded uncertainty (k=2) of 0.21 % in the temperature range from (313 to 363) K and pressures up to 25 MPa. The pure compound densities were calculated from previous density measurements represented by the Pimentel-Galicia model. This empirical correlation of the pure compounds was used before for the excess molar volume calculation. The experimental data of the mixtures reported in this work were modeled by the Pimentel-Galicia model at each composition with deviations not higher than 0.07 %. The combined standard uncertainty for composition (considering the purities of the samples) is ucx= 0.0026. Finally, the isothermal compressibility and isobaric thermal expansivity were evaluated from density data.

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来源期刊
Journal of Chemical Thermodynamics
Journal of Chemical Thermodynamics 工程技术-热力学
CiteScore
5.60
自引率
15.40%
发文量
199
审稿时长
79 days
期刊介绍: The Journal of Chemical Thermodynamics exists primarily for dissemination of significant new knowledge in experimental equilibrium thermodynamics and transport properties of chemical systems. The defining attributes of The Journal are the quality and relevance of the papers published. The Journal publishes work relating to gases, liquids, solids, polymers, mixtures, solutions and interfaces. Studies on systems with variability, such as biological or bio-based materials, gas hydrates, among others, will also be considered provided these are well characterized and reproducible where possible. Experimental methods should be described in sufficient detail to allow critical assessment of the accuracy claimed. Authors are encouraged to provide physical or chemical interpretations of the results. Articles can contain modelling sections providing representations of data or molecular insights into the properties or transformations studied. Theoretical papers on chemical thermodynamics using molecular theory or modelling are also considered. The Journal welcomes review articles in the field of chemical thermodynamics but prospective authors should first consult one of the Editors concerning the suitability of the proposed review. Contributions of a routine nature or reporting on uncharacterised materials are not accepted.
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