Rackett equation

VSTR = O Connell characteristic volume parameter, cm /g-mol ZRA = Rackett equation parameter RD = mean radius of gyration, A DM = dipole moment, D R = UNIQUAC r Q = UNIQUAC q QP = UNIQUAC q ... [Pg.143]

Subroutine MVOLM. MVOLM calculates the liquid molar volume at a given temperature using the modified Rackett equation... [Pg.219]

MOOIFIEO RACKETT EQUATION FURTHER MOOIFIEO EMPIRICALLY FQP T/TC. ST. 0.7S ... [Pg.258]

Standard-state fugacities at zero pressure are evaluated using the Equation (A-2) for both condensable and noncondensable components. The Rackett Equation (B-2) is evaluated to determine the liquid molar volumes as a function of temperature. Standard-state fugacities at system temperature and pressure are given by the product of the standard-state fugacity at zero pressure and the Poynting correction shown in Equation (4-1). Double precision is advisable. [Pg.308]

Another empirical model for Hquid pressure—volume behavior is the generalized equation for the molar volumes of saturated Hquids given by the Rackett equation ... [Pg.234]

The modified Rackett equation, density = (P /fiT.,)/ZRA was used. See Spencer, C. F., and R. P Danner, Improved Equation for Prediction of Saturated Liquid Density, y. Chem. Eng. Data 17, 236... [Pg.142]

Rutherford [43] reports the use of the modified Rackett equation to correlate the density for alkyl chlorides (1-chloroethane, 1-chloropropane, and 1-chlorobutane) and bromides (bromomethane, bromoethane, and bromopropane) as a function of temperature, pressure, and critical point data. [Pg.49]

The liquid densities for all four compounds." s well as the constants for the modified Rackett equation. 1 arc available. [Pg.161]

Mixing rules for both the modified Rackett and Hankinson equations have been published and are given below. The modified Rackett equation (15) for mixtures at their bubble points is... [Pg.697]

Estimate the density of propane using the Rackett equation... [Pg.116]

The determination of molar volumes of molecular species in the liquid phase can be performed with the Rackett equation [58], requiring critical temperature, pressure and volume as well as a further fitting parameter. It is possible to calculate the molar volumes of electrolyte species using the two-parameter equation of Clarke (see Ref. [52]). [Pg.279]

H. G. Rackett, Equation of state for saturated liquids,/. Chem. Eng. [Pg.309]

Rackett equation, 97 Rankine cycle, 250-253 Raoult s law, 304-316 deviations from, 348-349, 352 modified, for low pressures, 351-356, 388-393... [Pg.363]

Estimate the density of saturated liquid ammonia at 37°C (310 K, or 99°F) using (a) the Gunn-Yamada generalized correlation, and (b) the Rackett equation. The Gunn-Yamada correlation [16] is... [Pg.15]

Related Calculations. Both the Gunn-Yamada and Rackett equations are limited to saturated liquids. At or below a Tr of 0.99, the Gunn-Yamada equation appears to be quite accurate for nonpolar as well as slightly polar compounds. With either equation, the errors for nonpolar compounds are generally within 1 percent. The correlation of Yen and Woods [18] is more general, being applicable to compressed as well as saturated liquids. [Pg.16]

Typical values for the specific gravity of canola oil are shown in Table 13. Ackman and Eaton (56) indicated that a different proportion between eicosenoic (C20 l) and octadecanoic, polyunsaturated fatty acids could be a major factor in changing the relative density of canola oil. Noureddini et al. (57) described relationship between temperature and density of vegetable oils including canola. As for other liquids, the density for vegetable oils is temperature dependent and decreases in value when the temperature increases. The same authors also modified the Rackett equation to calculate density, which is based on the composition of fatty acids. [Pg.717]

For the liquid phases, the compressibilities are most commonly computed using the generalized correlations for liquids and analytical equations of state. Reid et alP describe in detail the various correlations available for the computation of liquid phase densities for pure components, with the modified Rackett equation being the most popular. For mixtures, the use of an analytical equation of state is most preferable with cubic equations of state being the favourite type of equation of state. [Pg.270]

Recommended Method Spencer-Danner-Li mixing rules with Rackett equation. [Pg.533]

The two approaches presented in this section need not be mutually exclusive one can use a correlation for some properties and an equation of state for others. Because of the poor liquid density predictions of many cubic equations of state, it is common to use semiempirical correlations for liquid density (such as the Rackett equation [15]) while using an EOS for vapor-liquid equilibria. [Pg.7]

Results from the data compilation of Yaws and co-workers (44,54) were selected. A modified Rackett equation was used for correlation of the data ... [Pg.2]

Results from the data compilation of Yaws and co-workers (54) were selected for liquid density from low temperatures at the melting point to higher temperatures up to the critical point. A modified Rackett equation, Equation (1-3), was used for correlation of the data as a function of temperature. Results from the correlation are in favorable agreement with data. Deviations are less than 1-2% in most cases. [Pg.14]

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