Calculate the Partial Pressure of the Hydrocarbon Vapor at the Flash Zone
Take the quantity of stripping steam as 1.2 lb/gal of residue (from Fig. 10).
The lb=h of stripping steam is 1:2 Â 24, 150 ¼ 28, 980 lb=h:
¼ 1, 610 mol=h
The partial pressure of the hydrocarbon vapor therefore is
Moles HC vapor
Total moles vapor
 Total pressure ¼
1, 364:4
1, 364:4 þ 1, 610
 40 psia ¼ 18:35 psia:
0 10 20 30 40 50
% Volume Distilled
60 70 80 90 100
800
700
600
500
400 400
3
Temp Temp°F
Temp°F
200 200
100 100
400
200
100
Naphtha Naphtha Naphtha
1
2
3
4
7
6
5
4
7
8
10 10 10
9
10
LGO LGO LGO
HGO HGO HGO
11
Kero Kero Kero
Fig. 17 Product curves and narrow range components
162
D.S.J. Jones
Take the quantity of stripping steam as 1.2 lb/gal of residue (from Fig. 10).
The lb=h of stripping steam is 1:2 Â 24, 150 ¼ 28, 980 lb=h:
¼ 1, 610 mol=h
The partial pressure of the hydrocarbon vapor therefore is
Moles HC vapor
Total moles vapor
 Total pressure ¼
1, 364:4
1, 364:4 þ 1, 610
 40 psia ¼ 18:35 psia:
0 10 20 30 40 50
% Volume Distilled
60 70 80 90 100
800
700
600
500
400 400
3
Temp Temp°F
Temp°F
200 200
100 100
400
200
100
Naphtha Naphtha Naphtha
1
2
3
4
7
6
5
4
7
8
10 10 10
9
10
LGO LGO LGO
HGO HGO HGO
11
Kero Kero Kero
Fig. 17 Product curves and narrow range components
162
D.S.J. Jones