Abstract
Reactions between sodium species and sulfur species have been studied in propane flames containing trace amounts of sodium (∼0.1 ppm Na). The results are compatible with the formation of gaseous NaS and NaSO3 in fuel-rich and fuel-lean flames, respectively, and both species at intermediate stoichiometries. Values for the equilibrium constants have been found for the gas phase reactions NaOH+S=NaS+OH (7a) NaOH+SO3=NaSO3+OH (8a) namely, K7a=exp(13.6±1.3)·exp(−58.1±5.0 kcal/RT) (95% confidence limits) in the temperature range 1750° to 2380°K and K8a=exp(14.6±3.3)·exp(−41.2±1.3 kcal/RT) (95% confidence limits) in the range 1600° to 2150°K. As NaOH and Na are equilibrated by the reaction NaOH+H=Na+H2O (2) either Na or NaOH may be the reactant forming the compounds NaS and NaSO3. The formation of NaSO3 is shown to be compatible with data reported for fuel-lean hydrogen flames, for which Fenimore4 postulated the formation of NaSO2. In cooler fuel-rich flames the gas phase reactions identified above are accompanied by another type of reaction at low sulfur additions. The possible reason for this is discussed.
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