distillate will meet the propane LPG specification which leaves as the bottom product
from the deethanizer with respect to its C 4 content. The fractionation in the
deethanizer will be such as to ensure that the C 2 and lighter content of the propane
LPG will meet that LPG’s Reid Vapor Pressure specification.
700
600
500
400
300
200
100
”
”
”
”
Light Ends
C 3 0.306 % Vol
0
iC 4 0.224
iC 5 0.954
nC 5 1.201
nC 4 1.180
60
50
40
30
% Vol
20
10
0
C 5 − 180 °F
7.28 %
1.71
180 − 2.0
210 − 380 °F
14.2 %
380 − 520 °F
9.09 %
60
70
18.55 %
750 − 930 °F
80
90
700
900
1300
Temp °F
1100
21.33 %
930 °F +
% Vol
520 − 650 °F
13.83 %
650 − 750 °F
10.85 %
3.16 %
−100
Temp
°F
Fig. 1 Sassan crude TBP curve and product split
56
D.S.J. Jones and S.A. Treese