Correlation method for determining compressed liquid densities

Ewbank, W. J.; Harden, Darrel G.

doi:10.1021/je60034a018

Cited by 8 publications

(3 citation statements)

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“…Of the correlations reviewed by Rea et al (1973), the generalized Lu equation, as extended by Ewbank and Harden (1967), lacks mixing rules. The same is true of the method presented by Lyckman et al (1965Lyckman et al ( ,1969.…”

Section: Scopementioning

confidence: 99%

“…Values for the constants have been obtained, and the densities calculated using the new correlations are compared with those obtained using the Yen-Woods (1966) method. Rea et al (1973) and Reid et al (1977) discuss three compressed liquid density correlations: the generalized Lu Equation as extended by Ewbank and Harden (1967), the Yen-Woods correlation (1966) using specific parameters for each compound, and the Lyckman et al (1965Lyckman et al ( , 1969 method. The Lu Equation gives good results for pure compounds for which a reference density is known, but no mixing rules have been given.…”

Section: Conclusion and Significancementioning

confidence: 99%

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An improved correlation for densities of compressed liquids and liquid mixtures

1982

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The Tait equation has been extended and generalized to permit the calculation of densities of compressed liquids and their mixtures to a pressure of 68,950 kPa (l0,ooO psia) using only critical temperature, critical pressure, Soave-Redlich-Kwong acentric factor, saturation pressure, and saturated volume for a pure liquid or the corresponding mixture parameters for a liquid mixture. This correlation, together with the correlation developed by Hankinson and Thomson (1979) (1965,1969). In order to achieve acceptable accuracy, the Yen-Woods (1966) correlation requires specific parameters for each compound. The Tait (1888) and Hudleston (1937) equations also lack mixing rules and have generally been used to fit and smooth experimental data.In this work the Tait equation was extended and its parameters were generalized as functions of an acentric factor derived from the Soave-Redlich-Kwong equation of state, critical temperature, and critical pressure. The saturated density and saturation pressure of the liquid which are used in the Tait equation were calculated using the saturated liquid density correlation developed by Hankinson and Thomson (1979) and a generalized vapor pressure equation. The two density correlations together comprise COSTALD, a unified method of estimating saturated and compressed densities of pure liquids and liquid mixtures. CONCLUSIONS AND SIGNIFICANCEThe Tait (1888) equation has been extended to permit accurate prediction of compressed densities of a wide variety of liquids and mixtures for temperatures in the general range of 50 to 600 K and pressures from saturation to 68,950 kPa (l0,ooO psia) using only critical temperature, critical pressure, SRK acentric factor, saturated volume, and saturation pressure for a pure liquid or the corresponding parameters for a mixture.A universal temperature dependence for all nonpolar and slightly polar liquids and mixtures was determined for the constant B in the Tait equation. Both Tait equation constants, B and C , were generalized as functions of the SRK acentric factor. Densities calculated using the extended Tait equation in conjunction with a saturated liquid density equation, COS-TALD (Corresponding STAtes Liquid Density), recently developed by Hankinson and Thomson (1979), were compared with those calculated using the Yen-Woods (1966) method. The data base used for testing consisted of 6,338 density points for pure, nonpolar liquids, 1,352 points for polar and quantum liquids, and 6,926 mixture density points including 319 points for LNG/LPG mixtures.The COSTALD correlation is shown to be the most general and most accurate compressed liquid density correlation yet published. Average absolute errors in densities calculated using COSTALD were 0.446% and 2.57% for pure nonpolar and polar liquids respectively compared to 1.49% and 3.48% errors obtained with the Yen-Woods method. COSTALD gave 0.369% and 1.61% average absolute errors for LNG/LPG mixtures and for all mixtures compared to 1.46% and 2.51% for the YenWoods method.The two parts of the COST...

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Section: Scopementioning

confidence: 99%

Section: Conclusion and Significancementioning

confidence: 99%

An improved correlation for densities of compressed liquids and liquid mixtures

1982

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“…The equation of Lyckman et al ( 22) is the recommended method for calculating the saturated liquid density, ps. This equation has the form: Pc/Ps =Vr= vy°> + /1> + 2 /2> (9) The VV(1,'s are generalized functions of Tr and is the acentric factor. Again, the critical density must be known or estimated.…”

Section: Alternative Analytical Methodsmentioning

confidence: 99%

Effect of pressure and temperature on the liquid densities of pure hydrocarbons

Rea¹,

Spencer²,

Danner³

1973

J. Chem. Eng. Data

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and the ether was evaporated at approximately 40°C. The gas chromatography in this case was performed on a 6-ft Porapak Q column and thermal conductivity detector. In this way the solubility of water in diethyl ether was determined to be 1.28% (w/w) at 23°C. A value of 1.31% w/w is calculated from the data of Hill (4), who employed a volumetric procedure. This is within the ±3% range assumed for the precision of the sampling technique.

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A generalized correlation for the compressibilities of normal liquids

Chueh

Prausnitz

1969

AIChE Journal

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Correlation method for determining compressed liquid densities

Cited by 8 publications

References 2 publications

An improved correlation for densities of compressed liquids and liquid mixtures

An improved correlation for densities of compressed liquids and liquid mixtures

Effect of pressure and temperature on the liquid densities of pure hydrocarbons

A generalized correlation for the compressibilities of normal liquids

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