The Law of Corresponding States for Hydrocarbons: the Two-Phase Region

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Consider the following six chemical species: ethane, propane, -butane,
-butane,
-pentane, and
-hexane. For each compound, this Demonstration uses arc-length continuation to plot (1) the compressibility factor
versus reduced temperature
for user-set values of the reduced pressure
, or (2) the compressibility factor
versus reduced pressure
for user-set values of the reduced temperature
. You can choose between two equations of state for EOS; namely the Soave–Redlich–Kwong EOS or the Peng–Robinson EOS (see the Details section).
Contributed by: Housam Binous, Nayef M. Alsaifi, Ali Kh. Al-Matar, and Brian G. Higgins (April 2014)
Open content licensed under CC BY-NC-SA
Snapshots
Details
In the Soave–Redlich–Kwong (SRK) equation of state, the compressibility factor occurs as a solution of the cubic equation
,
where and
, with
,
,
, and
.
In the Peng–Robinson (PR) equation of state, the compressibility factor occurs as a solution of the cubic equation
,
where and
, with
,
,
, and
.
In the equations given above, is the acentric factor,
and
are the critical temperature and pressure, and
is the reduced pressure.
Reference
[1] W.-G. Dong and J. H. Lienhard, "Corresponding States Correlation of Saturated and Metastable Properties," The Canadian Journal of Chemical Engineering, 64(1), 1986 pp. 158–161. doi:10.1002/cjce.5450640123.
Permanent Citation