F ¼ 1=D
ð v
0
P s
P o
Á
K t
K 0
dv
(2)
where
V ¼ coil volume
D ¼ feed rate
K t ¼ reaction rate constant at any given temperature
K o , P o ¼ standard reference value for K t and P t
P t ¼ pressure at a given point in coil
The standard reference temperature for thermal cracking is taken as 800
F.
A curve giving value of K t /K o at a typical thermal cracking heater is given in Fig. 6.
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
900
880
840
860
Coil Temperature °F
KT/ K800°F Ratio
820
800
Fig. 6 Temperature versus
the K T / K 800
F ratio
Upgrading the Bottom of the Barrel
539
ð v
0
P s
P o
Á
K t
K 0
dv
(2)
where
V ¼ coil volume
D ¼ feed rate
K t ¼ reaction rate constant at any given temperature
K o , P o ¼ standard reference value for K t and P t
P t ¼ pressure at a given point in coil
The standard reference temperature for thermal cracking is taken as 800
F.
A curve giving value of K t /K o at a typical thermal cracking heater is given in Fig. 6.
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
900
880
840
860
Coil Temperature °F
KT/ K800°F Ratio
820
800
Fig. 6 Temperature versus
the K T / K 800
F ratio
Upgrading the Bottom of the Barrel
539