PVT [pressure-volume-temperature] properties of liquid n-alkane mixtures

Snyder, Phillip S.; Benson, Montford S.; Huang, H. S.; Winnick, Jack

doi:10.1021/je60061a024

Cited by 33 publications

(6 citation statements)

References 4 publications

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“…In order to obtain the values of the excess volumes through equation (8), density data of the pure compounds at the different temperatures and pressures are required. These values were taken from literature, and the literature sources are summarized in Table 8.…”

Section: Excess Volumementioning

confidence: 99%

“…Reamer et al − published data on the volumetric behavior of the ternary mixtures methane/propane/ n -decane and methane/ n -butane/ n -decane. Snyder et al measured density of a ternary mixture composed of n -decane/ n -tetradecane/ n -hexadecane. Pečar and Doleček determined density of the ternary system n -pentane/ n -hexane/ n -heptane.…”

Section: Introductionmentioning

confidence: 99%

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Density and Compressibility of Multicomponent n-Alkane Mixtures up to 463 K and 140 MPa

et al. 2017

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Section: Excess Volumementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Density and Compressibility of Multicomponent n-Alkane Mixtures up to 463 K and 140 MPa

et al. 2017

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“…Cutler et al; Nanda and Simha (1964); McDuffie et al;and Zordan and Henry (1975) treated C as a constant while Ginell (1961); Neece and Squire; and Kumagai considered it to be a weak function of temperature. Snyder and Winnick (1970) selected the values for B and C which fit their data best. They did not discuss the temperature dependence of the constants.…”

Section: Hudleston Equationmentioning

confidence: 99%

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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“…6) the order of the V E at both the low and the high benzene mole fractions has been fully reversed and the values at 50 and 100 MPa exceed those at 0.1 MPa. Examination of Table IX shows that at the lowest benzene composition, there is a pronounced maximum in V E at the two highest temperatures and substantial maxima are also observed for the two higher benzene compositions at 348.15 K. Snyder and co-workers [26] found a similar increase in excess volume with pressure in equimolar mixtures of n-decane and n-tetradecane as did Dymond and co-workers [27] for equimolar mixtures of n-hexane and n-dodecane and for n-decane with n-hexadecane.…”

Section: Mixtures Of Benzene and 224-trimethylpentanementioning

confidence: 95%

Volumetric measurements under pressure for 2,2,4-trimethylpentane at temperatures up to 353.15 K and for benzene and three of their mixtures at temperatures up to 348.15 K

Malhotra

Woolf

1993

Int J Thermophys

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p, V, T) data have been obtained in the form of volume ratios relative to 0.1 MPa for benzene (298.15 to 348.15K), 2,2,4-trimethylpentane (TMP) (313.15 to 353.15 K), and their mixtures near 0.25, 0.5, and 0.75 mole fraction of benzene (313.15 to 348.15 K) for pressures up to near the freezing pressures for benzene and the mixtures, and up to 400 MPa for TMP. Isothermal compressibilities xx, isobaric expansivitie ~, changes in heat capacity at constant pressure ACp, and excess molar volumes V E have been determined from the data. Literature data at atmospheric pressure have been used to convert the ACp to Cp at several temperatures. The isobars for ~ over the temperature range 278.15 to 353.15 K for TMP intersect near 47 MPa and reverse their order in temperature when plotted against pressure; normalization of the ~'s by dividing the values at each temperature by the ~ at 0.1 MPa prevents both the intersection and the reversal of the order. The V E are positive and have an unusual dependence on pressure: they increase with temperature and pressure so that the order of the curves for 0.1, 50, and 100 MPa changes in going from 313.15 to 348.15 K.

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PVT [pressure-volume-temperature] properties of liquid n-alkane mixtures

Cited by 33 publications

References 4 publications

Density and Compressibility of Multicomponent n-Alkane Mixtures up to 463 K and 140 MPa

Density and Compressibility of Multicomponent n-Alkane Mixtures up to 463 K and 140 MPa

An improved correlation for densities of compressed liquids and liquid mixtures

Volumetric measurements under pressure for 2,2,4-trimethylpentane at temperatures up to 353.15 K and for benzene and three of their mixtures at temperatures up to 348.15 K

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