Shock-initiated exothermic reactions. V. The oxidation of ethylene

1968 ◽  
Vol 21 (11) ◽  
pp. 2641 ◽  
Author(s):  
LJ Drummond
Keyword(s):  
Ethylene Oxide ◽  
Temperature Dependence ◽  
Induction Period ◽  
Exothermic Reactions

Mixtures of C2H4 with 02 or N3O and argon have been ignited with reflected shocks. The temperature dependence of the induction period to explosion suggests that the rate-controlling reaction for the C2H4-02 system is CH2O + O2 + CHO +HO2. Results for the C2H4-N2O system do not identify one particular reaction as being rate-controlling. A combination of reactions is probably involved. Possibilities include the pyrolysis of ethylene and of ethylene oxide and the reaction CH2+N2O → CH+OH+N2.

Shock-initiated exothermic reactions. VI. The oxidation of ethylene oxide and cyclopropane

1969 ◽  
Vol 22 (7) ◽  
pp. 1355 ◽  
Author(s):  
LJ Drummond ◽  
J Kikkert
Keyword(s):  
Shock Waves ◽  
Ethylene Oxide ◽  
Shock Tube ◽  
Induction Period ◽  
Ignition Delay ◽  
Exothermic Reactions ◽  
Induction Periods ◽  
Reflected Shock ◽  
Formaldehyde Oxidation ◽  
Temperature Dependences

Mixtures of ethylene oxide or cyclopropane with oxygen and argon were ignited with reflected shock waves In a shock tube. The temperature dependences of the ignition delay and the growth of light emitted during the induction period to explosion of C2H4O-O2 mixtures indicate that the rate-controlling reaction is that of formaldehyde oxidation. The temperature dependence of induction periods for C3H6-O2 mixtures suggests that a complicated but undetermined mechanism controls the delay to ignition.

The role of formaldehyde in the oxidation of ethylene

1952 ◽  
Vol 212 (1110) ◽  
pp. 291-311 ◽  
Keyword(s):  
Activation Energy ◽  
Ethylene Oxide ◽  
Induction Period ◽  
Maximum Rate ◽  
Reaction Scheme ◽  
Stationary Concentration ◽  
Rate Of Reaction ◽  
A Minor ◽  
Close Parallelism

The oxidation of ethylene at temperatures in the region of 400° C has been studied manometrically and analytically, and compared with the oxidation of formaldehyde under similar conditions. The observations of previous authors have been confirmed and extended with particular reference to the factors controlling the maximum rate of reaction. The oxidation of ethylene is closely dependent on the development of formaldehyde, which shows the behaviour to be expected of an agent for degenerate branching. There is a close parallelism between the variation of the activation energy of the oxidation of ethylene from 25 kcal at 350° C to 53 kcal at 550° C and of formaldehyde from 21 kcal at 350° C to more than 40 kcal at 500° C. Formaldehyde is produced in the oxidation of ethylene and attains a maximum concentration which is proportional to the ethylene pressure and independent of the oxygen pressure. The addition of formaldehyde to the reaction mixture reduces or removes the induction period without affecting the maximum rate of the reaction. Ethylene oxide plays a minor but significant part; it attains a stationary concentration in the reaction but is less effective than formaldehyde in reducing the induction period. A reaction scheme based on that proposed by Axford & Norrish (1948) for the oxidation of formaldehyde has been developed; it accounts satisfactorily for the observed facts.

Temperature dependence of the 720 cm?1 IR band of poly(octadecyl ethylene) and poly(octadecyl ethylene oxide) studies on comb-like polymers III

1980 ◽  
Vol 2 (4) ◽  
pp. 241-247 ◽  
Author(s):  
E. Benedetti ◽  
P. Vergamini ◽  
F. Andruzzi ◽  
P. L. Magagnini
Keyword(s):  
Ethylene Oxide ◽  
Temperature Dependence
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