用热力学状态方程分析气体混合物的非理想性

IF 0.9 Q4 THERMODYNAMICS
Ngoma MANUEL, T.c.f.s. MAJOR, S.m. PEDRO, António BARROS
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引用次数: 0

摘要

化学工程系统中气体行为的评估需要对控制给定系统中组件之间相互作用的热力学原理有深刻的理解。为此,单一气体或气体混合物的理想偏差与气体或气体混合物的实际行为与理想气体模型所预测的行为之间的差异有关。这项研究的目的是仔细检查从理想行为的偏差在气体混合物的CH4和CO2组成。分析采用三次状态方程:范德华方程、Soave-Redlich-Kwong方程和被截断到第三项的广义维里方程。这些方程因其在特定热力学条件下表征物质行为的效用而得到广泛认可。在296.15 K和15 bar条件下,使用热力学计算器,通过评估压力、体积和压力相关的压缩系数变化来评估混合物的行为。本研究的结果揭示了高压力下分子间引力和低压力下分子间排斥力的普遍存在。使用Soave-Redlich-Kwong方程对改变CH4组成的影响进行了类似的检查,该方程包含允许评估混合物中分子大小和分子间相互作用影响的参数。并利用实验数据对研究结果进行了验证。因此,可以推断,这些方程提供了压力对分子相互作用力的影响,包括排斥力和引力,这反过来又可以定义一个真实系统的新体积。因此,基于本文建立的确证,这些方程显示出高度的一致性和适用性,从而扩大了热力学研究的领域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Use the Thermodynamic State Equations to Analyze the Non-ideality of Gas Mixtures
The assessment of gas behavior in chemical engineering systems necessitates a profound understanding of thermodynamic principles that govern the interactions among the components within a given system. To this end, the deviation from ideality in a single gas or gas mixture is associated with the disparity between the actual behavior of the gas or gas mixture and the behavior anticipated by the ideal gas model. This study is aimed at scrutinizing the deviation from ideal behavior in a gas mixture composed of CH4 and CO2. The analysis employs the cubic equations of state: Van Der Waals, Soave-Redlich-Kwong, and generalized Virial equations, truncated to the third term. These equations are widely recognized for their utility in characterizing substance behavior under specific thermodynamic conditions. The investigation involves an evaluation of the mixture's behavior by assessing variations in the compressibility factor concerning pressure, volume, and pressure, using a thermodynamic calculator at 296.15 K and 15 bar. The findings of this study reveal the prevalence of attractive intermolecular forces at higher pressures and repulsive interactions at lower pressures. An analogous examination of the effect of altering the composition of CH4 was undertaken using the Soave-Redlich-Kwong equation, which incorporates parameters allowing for an evaluation of the impact of molecule size and intermolecular interactions within the mixture. Furthermore, experimental data were employed to validate the results obtained in this study. Consequently, it can be inferred that these equations provide insight into the influence of pressure on molecular interaction forces, encompassing repulsive and attractive forces, which in turn can define the new volume of a real system. Thus, based on the corroboration established herein, these equations demonstrate a high degree of consistency and applicability, thereby expanding the realm of thermodynamic inquiry.
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来源期刊
CiteScore
1.50
自引率
12.50%
发文量
35
期刊介绍: The purpose and scope of the International Journal of Thermodynamics is · to provide a forum for the publication of original theoretical and applied work in the field of thermodynamics as it relates to systems, states, processes, and both non-equilibrium and equilibrium phenomena at all temporal and spatial scales. · to provide a multidisciplinary and international platform for the dissemination to academia and industry of both scientific and engineering contributions, which touch upon a broad class of disciplines that are foundationally linked to thermodynamics and the methods and analyses derived there from. · to assess how both the first and particularly the second laws of thermodynamics touch upon these disciplines. · to highlight innovative & pioneer research in the field of thermodynamics in the following subjects (but not limited to the following, novel research in new areas are strongly suggested): o Entropy in thermodynamics and information theory. o Thermodynamics in process intensification. o Biothermodynamics (topics such as self-organization far from equilibrium etc.) o Thermodynamics of nonadditive systems. o Nonequilibrium thermal complex systems. o Sustainable design and thermodynamics. o Engineering thermodynamics. o Energy.
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