Page 67 - PVT Property Correlations

Dry Gases Chapter | 3 45

TABLE 3.11 Problem 2 Gas Composition
y i (mol%)
Hydrogen sulfide 0.50%
Carbon dioxide 1.25%
Nitrogen 0.00%
Methane 75.75%
Ethane 8.25%
Propane 6.35%
i-Butane 2.15%
n-Butane 2.25%
i-Pentane 1.15%
n-Pentane 1.10%
Hexanes 0.50%
Heptanes plus 0.75%
Sum 100%

C7 1 molecular weight and specific gravity are estimated in the labora-
tory to be 143 lb/lb mol and 0.752, respectively. Use Riazi and Daubert
(1987) to calculate critical properties for C7 1 .

Solution of Problem 2
From the composition, the gas-specific gravity would be calculated as in
Table 3.12.

Using Gas-Specific Gravity to Calculate the Gas Mixture Critical
Properties
Application of Sutton (2007)
P PcHC 5 744 2 125:4γ gHC 1 5:9γ 2 gHC ð3:21Þ
and
T PcHC 5 164:3 1 357:7γ gHC 2 67:7γ 2 gHC ð3:22Þ

where

γ gHC 5 γ y H 2 S M H 2 S 1 C CO 2 M CO 2 1 y N 2 M N 2 =M air ð3:23Þ
g
y HC