Page 317 - Characterization and Properties of Petroleum Fractions - M.R. Riazi
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AT029-Manual-v7.cls
AT029-07
June 22, 2007
AT029-Manual
7
Applications: Estimation of MNL50-EB/May 2007
Thermophysical Properties
NOMENCLATURE T Absolute temperature, K
Normal boiling point, K
T b
API API gravity defined in Eq. (2.4) T c Critical temperature, K --`,```,`,``````,`,````,```,,-`-`,,`,,`,`,,`---
A, B, C, D, E Coefficients in various equations T r Reduced temperature defined by Eq. (5.100)
a, b Cubic EOS parameters given in Table 5.1 (=T/T c ), dimensionless
a, b, c, d, e Constants in various equations T o A reference temperature for use in Eq. (7.5), K
C P Heat capacity at constant pressure defined by T M Freezing (melting) point for a pure component
Eq. (6.17), J/mol · K at 1.013 bar, K
C V Heat capacity at constant volume defined by T br Reduced boiling point (=T b /T c ), dimensionless
Eq. (6.18), J/mol · K T pc Pseudocritical temperature, K
Liquid density at temperature T and 1 atm, Triple point temperature, K
d T T tp
3
g/cm 3 V Molar volume at T and P,cm /mol
3
f (0) , f (1) Dimensionless functions for vapor pressure V c Critical molar volume, cm /mol
3
generalized correlation (Eq. 7.17) V S Molar volume of solid, cm /mol
H Enthalpy defined in Eq. (6.1), molar unit: x i Mole fraction of component i in a mixture, di-
J/mol; specific unit: kJ/kg mensionless
H% Hydrogen wt% in a petroleum fraction x wi Weight fraction of component i in a mixture
I Refractive index parameter at temperature T, (usually used for liquids), dimensionless
2
2
defined in Eq. (2.36) [= (n − 1)/(n + 2)], di- x P , x N , x A Fractions (i.e., mole) of paraffins, naphthenes,
mensionless and aromatics in a petroleum fraction, dimen-
K W Watson characterization factor defined by sionless
Eq. (2.13) Z Compressibility factor defined by Eq. (5.15),
log 10 Common logarithm (base 10) dimensionless
ln Natural logarithm (base e) Greek Letters
M Molecular weight (molar mass), g/mol [kg/
kmol] Difference between two values of a parameter
N Number of components in a mixture θ m A molar property (i.e., molar enthalpy, molar
N C Number of carbon atoms volume, etc ...)
N% Nitrogen wt% in a petroleum fraction θ s A specific property (i.e., specific enthalpy,
n Liquid refractive index at temperature T and etc . . . )
1 atm, dimensionless ρ Density at a given temperature and pressure,
3
3
O% Oxygen wt% in a petroleum fraction g/cm (molar density unit: cm /mol)
P Pressure, bar ρ m Molar density at a given temperature and pres-
P c Critical pressure, bar sure, mol/cm 3
Reduced pressure defined by Eq. (5.100) Reduced density (= ρ/ρ c = V c /V), dimension-
P r ρ r
(=P/P c ), dimensionless less
Triple point pressure, bar ρ w Water density at a given temperature, g/cm 3
P tp
P vap Vapor pressure at a given temperature, bar ω Acentric factor defined by Eq. (2.10), dimen-
P sub Sublimation pressure (vapor pressure of a sionless
f
solid) at a given temperature, bar H 298 Heat of formation at 298 K, kJ/mol
vap vap
P r Reduced vapor pressure at a given temperature H Heat of vaporization (or latent heat) at temper-
(=P vap /P c ), dimensionless ature T, J/mol
Q A parameter defined in Eq. (7.21) Superscript
R Gas constant = 8.314 J/mol · K (values in dif-
ferent units are given in Section 1.7.24) g Value of a property for gas phase
RVP Reid vapor pressure, bar ig Value of a property for component i as ideal
S% Sulfur wt% in a petroleum fraction gas at temperature T and P → 0
SG Specific gravity of liquid substance at 15.5 C L Value of a property at liquid phase
◦
(60 F) defined by Eq. (2.2), dimensionless V Value of a property at vapor phase
◦
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