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High-temperature pyrolysis of acetaldehyde

โœ Scribed by M. B. Colket III; D. W. Naegeli; I. Glassman

Publisher
John Wiley and Sons
Year
1975
Tongue
English
Weight
939 KB
Volume
7
Category
Article
ISSN
0538-8066

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โœฆ Synopsis

High-temperature (> 1000'K) pyrolysis of acetaldehyde (-1 % in an atmosphere of pure nitrogen) was examined in a turbulent flow reactor which permits accurate determination of the spatial distribution of the stable species, Results show that the products in order of decreasing importance are CO, CHI, H2, C a 6 , and c2H4. Rates of formation were consistent with the Rice-Herzfeld mechanism by including reactions to explain CzH4 formation and the possible presence of ketene. A steady-state treatment of the complete mechanism indicates that the overall reaction order decreases from to 1, which is supported by the new experimental data. Using earlier low-temperature results, the rate (-81,775 f lOOO/RT) sec-l. Also, data for the ratio of rate constants for reactions CH3CHO + CH, -+ CH4 + C H 3 C 0 (4) and ZCH3 -+ C2H.5(6) were fitted to the empirical expression k l / k & / 2 = 10-13.89*0.03T6.1 exp( -1720 f 70/RT) (cm3/mole .sec)l'z and causes for the curvature are discussed. The noncatalytic effect of oxygen on acetaldehyde pyrolysis at high temperature is explained. constant for the reaction CH3CH0 -+ CH3 + CHO (1) was found as kt = 1016.s6*o.z1 exP

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