Atmospheric Distillation
The outlet stream from the pre-heat train is fed a refluxed absorber with partial condenser to separate Off
Gases, Naphtha and Bottom Residue. A steam stream (vapor fraction =1.0, pressure =1380 kPa) is fed to
the tower bottom to provide heat. A water draw stream is required to remove the condensed steam from
the overhead condenser.
Column specifications are as follow:
Variable
Value
# of stages
29
Feed stage
28
Condenser pressure
140 Kpa
Condenser DP
60 Kpa
Condenser temperature
40 C
Top stage temperature
120 C
Bottom stage pressure
230 Kpa
Bottom stage temperature
340 C
OH vapor rate
0 kgmol/h
Steam flow rate
3400 Kg/h
Side strippers’ specifications are as follow:
AGO SS
Diesel SS
Kerosene SS
Configuration
Steam stripper Steam stripper Reboiled stripper
Steam Temperature C
150
150
-Steam pressure Kpa
350
350
-Steam flowrate kg/h
1150
1350
-Draw stage
22
17
9
Return stage
21
16
8
= 0.045 X 661.2 = 0.102 X 661.2 = 0.094 X 661.2 =
Product rate
= 29.75 m3/h = 124.97 m3/h
64.1 m3/h
Pump arounds specifications are as follow:
AGO PA Diesel PA Kerosene PA
Fow rate
200
200
330
Duty
-3.7E+07 -3.7E+07
-4.5E+07
Draw stage
22
17
9
Return stage
21
16
8