Abstract
The exothermic phenomena in the air oxidation of the mixture of sodium sulfide with carbonaceous materials were investigated by means of calorimetry.
Anhydrous sodium sulfide and three kinds of commercially available carbon blacks were used. The calorific values of the mixtures varied with the difference in the kind of carbon black used. Sodium sulfide in the mixture changed into sodium thiosulfate, sodium sulfite and sodium sulfate during the exothermic reaction.
Similar chemical changes on sodium sulfide were observed in aqueous sodium sulfide solution in which carbon black was dispersed.
From these results, it seems reasonable to assume that several kinds of functional groups, for example, carboxyl or phenol group on the surface of carbon black have great effects in the exothermic reaction.
