Page 253 - Characterization and Properties of Petroleum Fractions - M.R. Riazi

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AT029-Manual
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Specific gravity of gas fluid (pure or mixture)
−10
SG
g
Molecular size parameter, ˚ A (10
m)
σ
[= M /29], dimensionless T1: IML 6. THERMODYNAMIC RELATIONS FOR PROPERTY ESTIMATIONS 233
g
ω Acentric factor defined by Eq. (2.10)
SG Specific gravity of liquid substance at 15.5 C (60 F) ξ Packing fraction defined by Eq. (5.86),
◦
◦
defined by Eq. (2.2), dimensionless dimensionless
T Absolute temperature, K κ Isothermal compressibility defined by Eq. (6.25),
T c Critical temperature, K bar −1
T r Reduced temperature defined by Eq. (5.100) η Joule–Thomson coefficient defined by Eq. (6.27),
(= T/T c ), dimensionless K/bar
T B A parameter in the Standing correlation γ Heat capacity ratio (= C P /C V ), dimensionless
(Eq. 6. 202), K γ i Activity coefficient of component i in liquid solution
T M Freezing (melting) point for a pure component at defined by Eq. (6.112), dimensionless
1.013 bar, K γ 1 S Activity coefficient of a solid solute (component 1) in
Triple point temperature, K
T tp the liquid solution defined by Eq. (6.161), dimension-
3
V Molar volume, cm /gmol less
3
V L Saturated liquid molar volume, cm /gmol γ i ∞ Activity coefficient of component i in liquid solution
3
V sat Saturation molar volume, cm /gmol at infinite dilution (x i → 0), dimensionless
3
V V Saturated vapor molar volume, cm /gmol ˆ μ i Chemical potential of component i defined in
3
Critical volume (molar), cm /mol (or critical specific
V c Eq. (6.115)
3
volume, cm /g) C Pi Difference between heat capacity of liquid and solid
S
Reduced volume (= V/V c ) for pure component i (= C L − C ), J/mol · K
V r Pi Pi
3
◦
V 25 Liquid molar volume at 25 C, cm /mol H i f Heat of fusion (or latent heat of melting) for pure
x i Mole fraction of component i in a mixture (usually component i at the freezing point and 1.013 bar,
used for liquids), dimensionless J/mol
x wi Weight fraction of component i in a mixture (usually H vap Heat of vaporization (or latent heat of vaporization)
used for liquids), dimensionless at 1.013 bar defined by Eq. (6.98), J/mol
y i Mole fraction of i in mixture (usually used for gases), H mix Heat of mixing. J/mol
dimensionless M Property change for M due to mixing defined by
Z Compressibility factor defined by Eq. (5.15), Eq. (6.84)
dimensionless S i f Entropy of fusion for pure component i at the freezing
Z L Compressibility factor of liquid phase, point and 1.013 bar, J/mol · K
dimensionless S vap Entropy of vaporization at 1.013 bar defined by
Z V Compressibility factor of vapor phase, dimensionless Eq. (6.97), J/mol
Boiling point elevation for solvent 2 (Eq. 6.214), K
T b2
Freezing point depression for solvent 2
T M 2
Greek Letters (Eq. 6.213), K
α Parameter defined by Eq. (5.41), dimensionless V mix Volume change due to mixing defined by Eq. (6.86)
α S , β S Parameters defined based on velocity of sound for
correction of EOS parameters a and b defined by Superscript
Eq. (6.242), dimensionless
β Coefficient of thermal expansion defined by E Excess property defined for mixtures (with respect to
Eq. (6.24), K . ideal solution)
−1
Difference between two values of a parameter exp Experimental value
δ i Solubility parameter for i defined in Eq. (6.147), HS Value of a property for hard sphere molecules
3 1/2
(J/cm ) ig Value of a property for a component as ideal gas at
δ i Parameter used in Eq. (6.126), dimensionless temperature T and P → 0
δ ij Parameter defined in Eq. (5.70) id Value of a property for an ideal solution
ε Energy parameter in a potential energy function L Value of a property for liquid phase
ε Error parameter defined by Eq. (106), dimensionless R A residual property (with respect to ideal gas
Volume fraction of i in a liquid mixture defined by property)
i
Eq. (6.146) V Value of a property for vapor phase
φ Fugacity coefficient of pure i at T and P defined by vap Change in value of a property due to vaporization
Eq. (6.49), dimensionless S Value of a property for solid phase
Fugacity coefficient of component i at T and P in an sat Value of a property at saturation pressure
φ i
ideal solution mixture, dimensionless t Value of a property for the whole (total) system
ˆ φ i Fugacity coefficient of component i in a mixture at T [] (0) A dimensionless term in a generalized correlation for
and P defined by Eq. (6.110) a property of simple fluids
θ A parameter defined in Eq. (6.203), dimensionless [] (1) A dimensionless term in a generalized correlation for
ρ Density at a given temperature and pressure, g/cm 3 a property of acentric fluids
3
(molar density unit: cm /mol) [] (r) A dimensionless term in a generalized correlation for
σ Diameter of hard sphere molecule, ˚ A (10 −10 m) a property of reference fluids
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