Page 50 - Characterization and Properties of Petroleum Fractions

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AT029-Manual-v7.cls
August 16, 2007
AT029-02
AT029-Manual
Characterization and 16:6 MNL50-EB/May 2007
Properties of Pure 2
Hydrocarbons

NOMENCLATURE Greek Letters
Potential energy defined in Eq. (2.19)
--`,```,`,``````,`,````,```,,-`-`,,`,,`,`,,`---
API API gravity defined in Eq. (2.4) 3
A, B Parameters in a potential energy relation α Polarizability defined by Eq. (2.33), cm /mol
A, B Parameters in a two-parameter cubic ε Energy parameter in a potential energy relation
equation of state μ Absolute (dynamic) viscosity, cp [mPa·s]. Also
a, b, ... i Correlation constants in various used for dipole moment
equations ν Kinematic viscosity defined by Eq. (2.12), cSt
2
CH Carbon-to-hydrogen weight ratio θ [mm /s]
A property of hydrocarbon such as M, T c , P c , V c , I,
◦
d 20 Liquid density at 20 C and 1 atm, g/cm 3 d, T b ,...
Critical density defined by Eq. (2.9), g/cm 3
d c ρ Density at a given temperature and pressure,
F Intermolecular force 3
I Refractive index parameter defined in g/cm
Eq. (2.36) σ Surface tension, dyn/cm (= mN/m)
Watson (UOP) K factor defined by σ Size parameter in potential energy relation
K W ω Acentric factor defined by Eq. (2.10),
Eq. (2.13) dimensionless
ln Natural logarithm (base e)
Logarithm to the base 10
log 10
M Molecular weight, g/mol (kg/kmol) Superscript
n Sodium D line refractive index of ◦ Properties of n-alkanes from Twu correlations
liquid at 20 C and 1atm, dimensionless
◦
N A Avogadro’s number Subscripts
N C Carbon number (number of carbon
atoms in a hydrocarbon molecule) A Aromatic
P c Critical pressure, bar N Naphthenic
P vap Vapor (saturation) pressure, bar P Paraffinic
R Universal gas constant, 8.314 J/mol·K T Value of a property at temperature T
R i Refractivity intercept defined in Eq. (2.14) ◦ A reference state for T and P
R m Molar refraction defined in Eq. (2.34), ∞ Value of a property at M →∞
3
cm /g 20 Value of a property at 20 C
◦
R 2 R squared, defined in Eq. (2.136) 38(100) Value of kinematic viscosity at 38 C (100 F)
◦
◦
r Distance between molecules 99(210) Value of kinematic viscosity at 99 C (210 F)
◦
◦
SG Specific gravity of liquid substance at
15.5 C (60 F) defined by Eq. (2.2), Acronyms
◦
◦
dimensionless
Specific gravity of gas substance at 15.5 C %AAD Average absolute deviation percentage defined by
◦
SG g
(60 F) defined by Eq. (2.6), dimensionless Eq. (2.135)
◦
Boiling point, K API-TDB American Petroleum Institute—Technical Data
T b
Critical temperature, K Book
T c
Flash point, K %D Absolute deviation percentage defined by
T F
Melting (freezing point) point, K Eq. (2.134)
T M
3
V Molar volume, cm /gmol EOS Equation of state
V Saybolt universal viscosity, SUS IUPAC International Union of Pure and Applied
3
V c Critical volume (molar), cm /mol Chemistry
3
(or critical specific volume, cm /g) %MAD Maximum absolute deviation percentage
VGC Viscosity gravity constant defined by NIST National Institute of Standards and Technology
Eq. (2.15) RK Redlich–Kwong
Z c Critical compressibility factor defined by vdW van der Waals
Eq. (2.8), dimensionless R 2 R squared, Defined in Eq. (2.136)
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