A cubic equation of state for mixtures containing steam

Wormald, C.J.; Lancaster, Neil M.

doi:10.1039/f19898501315

Cited by 14 publications

(11 citation statements)

References 10 publications

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“…These measurements interpolated to x=0.5 are plotted in figure 6 at the temperatures 573 K and 598 K. The continuous curves drawn through the points were calculated from the equation of state for the vapour phase used by Wormald et al (25) to fit their H E m measurements on (water+hydrocarbon). The temperatures 573 K and 598 K are above the critical temperature (562.1 K) of benzene and below the critical temperature (647.2 K) of water, and measurements in the vapour phase can be made at increasing pressures until the saturation pressure of the least volatile of the two fluids (water) is reached.…”

Section: Continuity With Vapour Phase H E M Measurementsmentioning

confidence: 99%

“…However, the fit to water is worst at low temperatures and improves at higher temperatures where the kinetic energy largely destroys the structuring effects due to hydrogen bonds, and it is of interest to see how well the equation compares with the measurements on (water+benzene). Parameters for the equation were determined from critical parameters in the usual way, (25) and an approximate fit to our measurements was obtained by adjusting the parameter k 12 in the equation …”

Section: Comparison With the Patel-teja Equation Of Statementioning

confidence: 99%

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Excess enthalpies for (water + benzene) in the liquid and supercritical regions atT= 503 K toT= 592 K andp= 16.4 MPa

Wormald

Slater

1996

The Journal of Chemical Thermodynamics

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Section: Continuity With Vapour Phase H E M Measurementsmentioning

confidence: 99%

Section: Comparison With the Patel-teja Equation Of Statementioning

confidence: 99%

Excess enthalpies for (water + benzene) in the liquid and supercritical regions atT= 503 K toT= 592 K andp= 16.4 MPa

Wormald

Slater

1996

The Journal of Chemical Thermodynamics

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“…(1) were especially fitted to the volumetric properties of hydrocarbons, molar densities and enthalpies calculated from eqn. (1) for carbon dioxide using Kubic's generalised formulae for a( T), b and c( T ) are in good agreement with tabulated values. Molar densities of carbon dioxide calculated from eqn.…”

Section: + [B3 -3a(t)c(t)2/rt]/v: (2)mentioning

confidence: 99%

“…It was previously shown that measurements of the excess molar enthalpy H: for mixtures of steam with n-alkanes from methane to octane can be fitted using a cubic equation of state and one-fluid mixing rules. 'V2 The Kubic3 modification of the equation of state, (1) was used. This equation can be written as a series expansion similar to the virial equation of state, and the first four terms are,…”

mentioning

confidence: 99%

Volumetric properties of steam–carbon dioxide mixtures derived from excess molar enthalpy measurements

Massucci¹,

Wormald²

1994

J. Chem. Soc., Faraday Trans.

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Flow calorimetric measurements of the excess molar enthalpy, H k , of [0.5H,0-O.5CO2] (g), which extend over the temperature range 448.2 to 698.2 K and at pressures up to 20 MPa, were recently reported. In the initial analysis of these measurements, the residual molar enthalpy of carbon dioxide was calculated from the equation of state proposed by Kubic, the residual molar enthalpy of steam was calculated from a modification of Kubic's equation proposed by Lancaster and Wormald, and simple one-fluid mixing rules were used to calculate the residual molar enthalpy of the mixture. The binary interaction constant used to secure agreement between experimental and calculated H k values was 5 = 1.33. This value is larger than that for steam-alkane interactions, and was attributed to a weak specific interaction between steam and carbon dioxide molecules in the vapour phase. The H k measurements have now been reanalysed using mixing rules which include terms to account for the association between the unlike molecules. This results in a value of the equilibrium constantK,, (298.15 K) = 0.0954 MPa-', and a value of AH,2 = -11.7 kJ mol-' for the enthalpy of the specific interaction between steam and carbon dioxide. The use of the association model slightly improves the fit to theH: measurements and gives good agreement with experimental values of volumetric properties, particularly at low temperatures.

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“…The a(T) terms were obtained from second virial coefficients of methanol and ethanol derived from flow calorimetric measurements of the excess molar enthalpy of the alcohol with nitr~gen,'.~ and the c(T) terms were determined by fitting eqn. (1) to saturated vapour densities. For methanol, a(T) and c(T), are given by the expressions a(T) = --923223, + 187395 + 305869Tr- ' + 98693, exp(3.763 Tr-I )…”

mentioning

confidence: 99%

Excess molar enthalpies of methanol–n-pentane and methanol–n-hexane from 454.4 to 522.7 K and up to 6 MPa

Massucci¹,

Wormald²

1993

J. Chem. Soc., Faraday Trans.

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Flow calorimetric measurements of the excess molar enthalpy, # : , of (0.5CH30H + OSC,H,,)(g) and (0.5CH30H + 0.5C6H,.)(g) are reported. The measurements extend over the temperature range 454.4-522.7 K and at pressures up to 6 MPa. Residual enthalpies of n-pentane and n-hexane were calculated from the equation of state proposed by Kubic, and the residual enthalpy of methanol was calculated from a modification of Kubic's equation proposed by Massucci and Wormald. For methanol in its interaction with n-alkanes there is no hydrogen bonding, and to obtain equation of state parameters for this interaction a pseudo-critical temperature of 270 K and a pseudo-critical pressure of 4.99 MPa for methanol were used. With these parameters, the measurements on both mixtures could be fitted using the usual one-fluid combining rules.

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A cubic equation of state for mixtures containing steam

Cited by 14 publications

References 10 publications

Excess enthalpies for (water + benzene) in the liquid and supercritical regions atT= 503 K toT= 592 K andp= 16.4 MPa

Excess enthalpies for (water + benzene) in the liquid and supercritical regions atT= 503 K toT= 592 K andp= 16.4 MPa

Volumetric properties of steam–carbon dioxide mixtures derived from excess molar enthalpy measurements

Excess molar enthalpies of methanol–n-pentane and methanol–n-hexane from 454.4 to 522.7 K and up to 6 MPa

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