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- W2022773612 abstract "The cool flames of three ketones (acetone, methyl ethyl ketone, and diethyl ketone) have been studied in a static system. The pressure, light emission, and temperature of the reacting gases have been measured and recorded simultaneously. The light emission appears as a pale-blue glow to the naked eye, and occurs not only in the cool flame, but also in the slow reaction before and after the passage of the flame. The maximum intensity of light occurs just after the rate of pressure change has reached its maximum value. Even in the slow reaction there are significant temperature increases. In the cool-flame region, the self-heating is even more marked-temperature rises of 20°C before the cool flame, and 120°C in the flame itself frequently being observed. The temperature rise begins at the center of the reaction vessel, and spreads out to the walls. The temperature changes observed in the flames at the critical condition are just sufficient to take the system into the region of negative temperature coefficient. Chemical analysis has shown that there is a considerable build-up of organic peroxides in the cool flame, followed by a very sharp fall as the flame temperature reaches its maximum. These facts combine to support the theory of cool flames put forward by Knox and Norrish and others. In this theory, the cool flame is regarded simply as a “low-temperature” slow reaction in which the rate of heat evolution is greater than the maximum rate of heat loss. Consequently, the reaction accelerates, but when the temperature reaches the negative temperature coefficient region this ceases. At the high temperatures reached, the low-temperature branching intermediate is rapidly destroyed, and so the rate falls. This sequence may be repeated a number of times thus leading to the phenomenon of multiple cool flames." @default.
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- W2022773612 date "1969-01-01" @default.
- W2022773612 modified "2023-09-23" @default.
- W2022773612 title "Cool-flame oxidation of ketones" @default.
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- W2022773612 doi "https://doi.org/10.1016/s0082-0784(69)80419-4" @default.
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