Contribution study of the thermodynamics properties of the ammonia-water mixtures

The full thermodynamic study of the absorption refrigeration units requires the knowledge of the thermodynamic properties of the used mixture. The present work deals with the mathematical modeling of the thermodynamic properties of ammonia-water mixtures using various models. The presented model covers high vapor-liquid equilibrium pressures up to 110 [bar] and temperatures from 230 to 600 [K]. Furthermore, the calculation of the thermodynamic properties of the ammonia-water mixtures and their pure components was carried out. The obtained results were compared with results given in the literature. This shows a good concordance. This article has been corrected. Link to the correction <a href="http://dx.doi.org/10.2298/TSCI180624196E">10.2298/TSCI180624196E</a>

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Prediction of Vapor–Liquid Equilibrium and Thermodynamic Properties of Natural Gas and Gas Condensates

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.9b00756 ◽

2019 ◽

Vol 58 (17) ◽

pp. 7370-7388 ◽

Cited By ~ 2

Author(s):

Nefeli Novak ◽

Vasiliki Louli ◽

Epaminondas Voutsas

Keyword(s):

Natural Gas ◽

Thermodynamic Properties ◽

Liquid Equilibrium ◽

Vapor Liquid Equilibrium ◽

Gas Condensates ◽

Vapor Liquid

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Impact of Impurities in CO2-Fluids on CO2 Transport Process

Volume 4: Cycle Innovations; Electric Power; Industrial and Cogeneration; Manufacturing Materials and Metallurgy ◽

10.1115/gt2006-90954 ◽

2006 ◽

Cited By ~ 8

Author(s):

H. Li ◽

J. Yan

Keyword(s):

Thermodynamic Properties ◽

Critical Point ◽

Transport Process ◽

Liquid Equilibrium ◽

Vapor Liquid Equilibrium ◽

Motor Carriers ◽

Co2 Transport ◽

Process Studies ◽

The Common ◽

The Impact

There are four possible transportation means that could be used to deliver CO2: motor carriers, railway carriers, water carriers, and pipeline. The impurities in CO2-fluids have significant impacts on the thermodynamic properties that will further affect the design, operation and cost of CO2 transport. This paper focuses on how impurities in CO2-fluids affect thermodynamic properties, and how the changes of properties affect CO2 transport process. Vapor-liquid equilibrium (VLE), critical point and densities are essential thermodynamic properties for designing a CO2 transport process. Studies on these properties will be carried out for CO2-mixtures based on the combinations of the common impurities such as SO2, H2S, CH4, Ar, O2 and N2. Moreover with a real case of pipeline for CO2 transport, the impact of impurities on transport process will be demonstrated in more details.

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Renormalization Group Theory Applied to the CPA Equation of State: Impacts on Phase Equilibrium and Derivative Properties

10.26434/chemrxiv.8126690.v1 ◽

2019 ◽

Author(s):

Gabriel Silva ◽

Charlles Abreu ◽

Frederico W. Tavares

Keyword(s):

Renormalization Group ◽

Equation Of State ◽

Thermodynamic Properties ◽

Chemical Engineering ◽

Equations Of State ◽

Thermodynamic Description ◽

Critical Conditions ◽

Liquid Equilibrium ◽

Vapor Liquid Equilibrium ◽

Vapor Liquid

Calculation of thermodynamic properties such as vapor-liquid phase behavior with equations of state is largely and successfully employed in chemical engineering applications. However, in the proximities of the critical point, the different density-fluctuation scales inherent to critical phenomena introduce significant changes in these thermodynamic properties, with which the classical equations of state are not prepared to deal. Aiming at correcting this failure, we apply a renormalization-group methodology to the CPA equation of state in order to improve the thermodynamic description in the vicinity of critical points. We use this approach to compute vapor-liquid equilibrium of pure components and binary mixtures, as well as derivative properties such as speed of sound and heat capacity. Our results show that this methodology is able to provide an equation of state with the correct non-classical behavior, thus bringing it in consonance with experimental observation of vapor-liquid equilibrium and derivative properties in near-critical conditions.

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