Cubic equations of state for adsorption layer: alkylthiopolyoxyethylene glycols

This article presents a new method of laboratory density determination and construction equations of state for marine waters with various ionic compositions and salinities was developed. The validation of the method was performed using the Ocean Standard Seawater and the UNESCO thermodynamic equation of state (EOS-80). Density measurements of water samples from the Aral Sea, the Black Sea and the Issyk-Kul Lake were performed using a high-precision laboratory density meter. The obtained results were compared with the density values calculated for the considered water samples by the EOS-80 equation. It was shown that difference in ionic composition between Standard Seawater and the considered water bodies results in significant inaccuracies in determination of water density using the EOS-80 equation. Basing on the laboratory measurements of density under various salinity and temperature values we constructed a new equation of state for the Aral Sea and the Black Sea water samples and estimated errors for their coefficients.

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Properties of Refrigerants from Cubic Equations of State

Revista de Chimie ◽

10.37358/rc.08.5.1827 ◽

2008 ◽

Vol 59 (5) ◽

Author(s):

Viorel Feroiu ◽

Dan Geana ◽

Catinca Secuianu

Keyword(s):

Experimental Data ◽

Vapor Pressure ◽

Equations Of State ◽

Ternary Mixtures ◽

Volumetric Properties ◽

Mixing Rules ◽

Saturation Curve ◽

Equilibrium Thermodynamic ◽

Liquid Equilibrium ◽

Binary And Ternary Mixtures

Vapour � liquid equilibrium, thermodynamic and volumetric properties were predicted for three pure hydrofluorocarbons: difluoromethane (R32), pentafluoroethane (R125) and 1,1,1,2 � tetrafluoroethane (R134a) as well as for binary and ternary mixtures of these refrigerants. Three cubic equations of state GEOS3C, SRK (Soave � Redlich � Kwong) and PR (Peng � Robinson) were used. A wide comparison with literature experimental data was made. For the refrigerant mixtures, classical van der Waals mixing rules without interaction parameters were used. The GEOS3C equation, with three parameters estimated by matching several points on the saturation curve (vapor pressure and corresponding liquid volumes), compares favorably to other equations in literature, being simple enough for applications.

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The Operational Equations of State, 4: The Dulong-Petit Equation of State for Hydrocode

10.21236/ada568915 ◽

2012 ◽

Cited By ~ 1

Author(s):

Michael Grinfeld

Keyword(s):

Equation Of State ◽

Equations Of State

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Wide-range equations of state for organic liquids

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2007.1.011 ◽

2007 ◽

Vol 5 ◽

pp. 113-120 ◽

Cited By ~ 1

Author(s):

R.Kh. Bolotnova

Keyword(s):

High Pressures ◽

Equations Of State ◽

Organic Liquids ◽

Liquid Phases ◽

Wide Range ◽

High Pressures And Temperatures

The method of construction the wide-range equations of state for organic liquids, describing the gas and liquid phases including dissociation and ionization which occurs during an intense collapse of steam bubbles and accompanied by ultra-high pressures and temperatures, is proposed.

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