792. The thermal decomposition of azomethane

Page, Matthew A.; Pritchard, H. O.; Trotman‐Dickenson, A. F.

doi:10.1039/jr9530003878

Cited by 10 publications

(5 citation statements)

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“…The kinetic data for azomethane have been questioned on the grounds that chain reaction contributions to the rate must be considered. 17 Steel and Trotman-Dickenson18 have recently found some evidence for a chain contribution to the rate but found that the fully inhibited reaction yielded a frequency factor of 1016•7 sec.-1 and an activation energy of 51.2 kcal./mole, in good agreement with the data of Ramsperger quoted above. Swinehart14 has reported that azomethane, azoethane and azoisopropane decomposed with no sign of a chain reaction.…”

Section: Discussionsupporting

confidence: 79%

The Thermal Decomposition of 2,2'-Azoisobutane¹

Levy¹,

Copeland²

1960

J. Am. Chem. Soc.

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Section: Discussionsupporting

confidence: 79%

The Thermal Decomposition of 2,2'-Azoisobutane¹

Levy¹,

Copeland²

1960

J. Am. Chem. Soc.

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“…Obviously, the basic approximation of the classical TE theory (neglect of the product formation) is incorrect even in this case. In accordance with the results of the study [12], let us introduce the values of kinetic parameters: E = 192 kJ mol −1 , k 0 = 10 14 s −1 , Q = 18 017 kJ mol −1 , c = 10 768 J K −1 mol −1 . The dependence of critical pressure on temperature at various values of heat removal parameter αS/V can be found with the use of (3.12) taking into account the form of dimensionless parameters (3.1).…”

Section: (B) Critical Conditionsmentioning

confidence: 99%

Critical ignition conditions in exothermically reacting systems: first-order reactions

Filimonov

2017

Proc. R. Soc. A.

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In this paper, the comparative analysis of the thermal explosion (TE) critical conditions on the planes temperature-conversion degree and temperature-time was conducted. It was established that the ignition criteria are almost identical only at relatively small values of Todes parameter. Otherwise, the results of critical conditions analysis on the plane temperature-conversion degree may be wrong. The asymptotic method of critical conditions calculation for the first-order reactions was proposed (taking into account the reactant consumption). The degeneration conditions of TE were determined. The calculation of critical conditions for specific first-order reaction was made. The comparison of the analytical results obtained with the results of numerical calculations and experimental data showed that they are in good agreement.

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“…Reaction (4), or some reaction similar to it, seems required to provide a second source of nitrogen and to propagate the chain [7,20,21]. I t is immaterial whether reaction (4) is a simple one-step process, as written, or a two step process, for the kinetic consequences would be indistinguishable.…”

Section: A a Preliminary Mechanismmentioning

confidence: 97%

The thermal decomposition of azomethane. III. Kinetics of the noninhibited reaction

Paquin

Forst

1973

Int J of Chemical Kinetics

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The thermal decomposition of azomethane (A) has been studied in a static system at temperatures between 250" and 320°C and at pressures between 5 and 402 torr, with particular attention to identification of products. Major products, in decreasing order of importance, were nitrogen, methane, ethane, methylethyldiimide, dimethylhydrazone, propane, tetramethylhydrazine, ethylene, methylpropyldiimide, and methylethylhydrazone. Carbon balance at the lowest pressure and highest temperature was 92%, but decreased with increasing pressure and decreasing temperature owing to the formation of a polymer. A fairly simple mechanism accounts reasonably well for a short chain in the decomposition, propagated by the radical CH3N2CH2 (B), and for the five most abundant products, except ethane. It turns out that there is a second source of ethane, arising by C2Hs + A + CzHs + B; this explains an anomalously high apparent activation energy for the reaction CH3 + A + CH4 + B. Ethyl radicals are also shown to be responsible for the formation of propane, ethylene, methylethylhydrazone, and methylpropyldiimide. The radical B decomposes to CHI + CH2 + Nz, and the methylene radical (probably both singlet and triplet) is shown to yield CZHS at low pressure and high temperature, and mostly polymer at high pressure and low temperature.

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792. The thermal decomposition of azomethane

Cited by 10 publications

References 0 publications

The Thermal Decomposition of 2,2'-Azoisobutane¹

The Thermal Decomposition of 2,2'-Azoisobutane¹

Critical ignition conditions in exothermically reacting systems: first-order reactions

The thermal decomposition of azomethane. III. Kinetics of the noninhibited reaction

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792. The thermal decomposition of azomethane

Cited by 10 publications

References 0 publications

The Thermal Decomposition of 2,2'-Azoisobutane1

The Thermal Decomposition of 2,2'-Azoisobutane1

Critical ignition conditions in exothermically reacting systems: first-order reactions

The thermal decomposition of azomethane. III. Kinetics of the noninhibited reaction

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The Thermal Decomposition of 2,2'-Azoisobutane¹

The Thermal Decomposition of 2,2'-Azoisobutane¹