thermal cracking of ethylene, propylene and light hydrocarbon

to the non-isothermal non-isobaric approach used by Van Damme et
a1 (6). Equation
‘
4, with the experimental tenperature and pressure
Profile included, was integrate numerically and the residual sum
Of squares 9 (Xexp-xcalculated
)$ was minimized with A, E and n as
Parmeters, using Liarquardt’s search routine (22). The results are
shown in Table 4,5,6 and 7 respectively, from which it follows that
there is a strong influence of temperature, partial and total
Pressure on the kinetic parameters in both ethylene and Propylene
cracking.
TABm 4
Influence of the temperature on the kinetic parameters of the
overall ethylene disappearance.
1.61 2 0.025
1.46 + 0.122
1.43 z 0.042
800 1.39 10 1.19 + 0.034
825 1.22 0.042
~~ ~~~ ~
TABU 5
Influence of the temperature on the kinetic par-ametcrs of
propylene cracking
9.42 1012
4.43 IO1,
800
82 5 2.99 10
TABLE 6
Influence of inlet partial pressure and total pressure on the
kinetic parameters of ethylene cracking.
I A 1 E(kcal/mol) 1 n t
Class 1 I 2.48 10” 54.220 f 1.260 1.29 2 0.046 !
Class 2 1 .I1 10;; 81.910 f 1.340 1.54 0.01
Class 3 54.430 f 2.170 1.27 2 0.027
Class 4 5.47 IOl3 66.400 2 .211 1.35 2 0.023
Class 5 I .50 1015 72.840 2 .i91 1.36 2 0.018
iA ll classes 2.51 IOl3 TkELE 60.400 7 2 .975 1.30 2 0.027
Influence of inlet partial pressure ana total pressure on the
kinetic parameters of propylene cracking.
E( Iccal/mol
n
1 1 A
Class 2
Class 3
class 4 1.89 10
Class 5 5.18
51.320 2 2.600
66.020 2 28.000
56.690 2 2.900
63.960 2 1.080
47.710 2 2.150
50.650 1 A00
139
1.02 2 0.035
1.02 2 0.37
1.05 2 0.028
1.18 + 0.040
1.15 0.063
1.08 2 0.037