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arXiv 0904.4795physics.chem-phphysics.comp-ph
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氮+氧+ Carbon Dioxide低温汽液平衡热力学模型

Thermodynamic Models for Vapor-Liquid Equilibria of Nitrogen+Oxygen+Carbon Dioxide at Low Temperatures

J. Vrabec, G. K. Kedia, U. Buchhauser, R. Meyer-Pittroff, H. Hasse

摘要:

为了设计和优化蒸馏法回收酒精发酵过程中的CO2,需要建立汽液平衡(VLE)模型。两个这样的热力学模型,Peng-Robinson状态方程(EOS)和基于亨利定律常数的模型,提出了三元混合物N2+O2+CO2。Peng-Robinson状态方程的纯物质参数取自文献,而Van der Waals单流体混合规则的二元参数根据实验二元汽液平衡数据进行调整。Peng-Robinson状态方程很好地描述了二元和三元的实验数据,除了在接近临界区域的高压下。用二元和三元汽液平衡实验数据对分子模型进行了模拟验证。在此基础上,通过分子模拟方法预测了CO2中N2和O2的亨利定律常数。一个易于使用的热力学模型,基于这些亨利定律常数,开发可靠地描述在富CO2区域的汽液平衡。

英文摘要:

For the design and optimization of CO2 recovery from alcoholic fermentation processes by distillation, models for vapor-liquid equilibria (VLE) are needed. Two such thermodynamic models, the Peng-Robinson equation of state (EOS) and a model based on Henry's law constants, are proposed for the ternary mixture N2+O2+CO2. Pure substance parameters of the Peng-Robinson EOS are taken from the literature, whereas the binary parameters of the Van der Waals one-fluid mixing rule are adjusted to experimental binary VLE data. The Peng-Robinson EOS describes both binary and ternary experimental data well, except at high pressures approaching the critical region. A molecular model is validated by simulation using binary and ternary experimental VLE data. On the basis of this model, the Henry's law constants of N2 and O2 in CO2 are predicted by molecular simulation. An easy-to-use thermodynamic model, based on those Henry's law constants, is developed to reliably describe the VLE in the CO2-rich region.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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