Petroleum Science and Technology, 24:1431–1435, 2006
Copyright © Taylor & Francis Group, LLC
ISSN: 1091-6466 print/1532-2459 online
DOI: 10.1080/10916460600809451
New Statistical Concepts for Prediction Viscosity,
Critical Temperature, and Critical Pressure of
Homologous Hydrocarbon Series (C
n
H
2n+2
)
A. K. A. A. Razzak, E. T. Hashim, and H. N. Al-Shurchi
College of Engineering, Sabratha, Libya
Abstract: A new model for prediction viscosity, critical temperature, and critical
pressure for homologous hydrocarbon series C
n
H
2n+2
as a function of carbon number
only. The new model has a general formula: η or T
c
or P = A
1
C
A
2
(2 + 2C)
A
3
.
This new model provides accurate and computationally reliable prediction for the
corresponding properties (η, T
c
, and P
c
) value.
Keywords: critical temperature and critical pressure of homologous hydrocarbons,
viscosity
INTRODUCTION
The viscosity η is of importance for disengagement of a liquid phase after
they are brought into equilibrium, since viscosity is defined as a shearing
stress per unit area divided by a velocity gradient. Chung et al. (1986, 1984)
has suggested that the final equation result may be expressed as:
η = 40.785
F
c
(MT)
1
2
V
2
3
c
u
(1)
F
c
= 1 - 0.27756ω + 0.059035µ
4
r
+ k
µ
r
= 131.3
µ
(V
c
T
c
)
1
2
Reichenberg (1975, 1979) has suggested an alternate corresponding states
relation for low-pressure gas velocity of organic compounds:
Address correspondence to Abdul Karim A. Abdul Razzak, College of Engineer-
ing, Sabratha, Libya. E-mail: dr_alzubidi@yahoo.com
1431