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Global Kinetic Constants for Thermal Oxidative Degradation of a Cellulosic Paper.


pdf icon Global Kinetic Constants for Thermal Oxidative Degradation of a Cellulosic Paper. (7329 K)
Kashiwagi, T.; Nambu, H.

Combustion Institute/Eastern Section. Chemical and Physical Processes in Combustion. Proceedings. Fall Technical Meeting, 1991. October 14-16, 1991, Ithaca, NY, 91/1-4 pp, 1991.

Combustion and Flame, Vol. 88, No. 3-4, 345-368, 1992.

Sponsor:

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH

Keywords:

combustion; paper; kinetic constants; kinetics; thermal oxidative; degradation; ignition; flame spread; microgravity; pyrolysis; weight loss rate; oxygen consumption; weight loss

Abstract:

Values of global kinetic constants for pyrolysis, thermal oxidative degradation, and char oxidation of a cellulosic paper were determined by a derivative thermal gravimetric study. The study was conducted at heating ranges of 0.5, 1, 1.5, 3, and 5 deg C/min in ambient atmospheres of nitrogen, 0.28%, 1.08%, 5.2% oxygen concentrtions and air. Sample weight loss rate, concentrationso of CO, CO2 and H2O in the degradation products, and oxygen consumption were continuously measured during the experiment. Values of activation energy, pre-exponential factor, orders of reaction and yields of CO, CO2, H2), total hydrocarbons, and char for each degradation reaction were derived from the results. Heat of reaction for each reaction was determined by differential scanning calorimetry. A comparison of the calcualted CO, CO2, H2O, total hydrocarbons, sample weight loss rate, oxygen consumption was made with the measured results using the derived kinetic constants and accuracy of the values of kinetic constants was discussed.