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1.
Volumetric properties of ethanol-water mixtures under high temperatures and pressures
Darja Pečar, Valter Doleček, 2005, izvirni znanstveni članek

Opis: The densities of ethanol and ethanol-water mixtures were measured with a vibrating tube densimeter at 25.0, 50.0 and 75.0°C in the pressure range from 0.10 to 40.00 MPa. Densities were correlated using an empirical model. Partial molar volumes, excess molar volumes, isothermal compressibilities, cubic expansion coefficients and internal pressures were calculated from obtained densities. This study reports the dependence of densities, partial molar volumes, excess molar volumes, isothermal compressibilities, cubic expansion coefficients and internal pressures on composition, temperature and pressure.
Ključne besede: ethanol, ethanol-water mixtures, density measurements, vibrating U tube densimeter, partial molar volumes, isothermal compressibility, isobaric expansibility, cubic expansion coefficient, internal pressure
Objavljeno: 01.06.2012; Ogledov: 1472; Prenosov: 58
URL Povezava na celotno besedilo

2.
Volumetric properties of ethanol-water mixtures under high pressure
Aljana Petek, Darja Pečar, Valter Doleček, 2001, izvirni znanstveni članek

Opis: Densities of ethanol-water mixtures have been measured using a vibrating tube densimeter and a different arrangement high-pressure experimental set-up. Measurements were carried out at 298,15 K in a pressure range from 0.1 MPa to 5MPa. Partial molar volumes, excess molar volumes and coefficients of isothermal compressibility were calculated. The molar volumes of alcohol and its partial molar volumes in mixtures with water are found to decrease monotonously with increasing pressure. Excess molar volumes are negative at all pressures. The numerical P-V relations at each composition are correlated satisfactorily as a function of pressure by the Hayward equation.
Ključne besede: chemistry, high-pressure vibrating tube densimeter, excess molar values, isothermal compressibility
Objavljeno: 10.07.2015; Ogledov: 556; Prenosov: 35
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