HIGH-PURITY SODIUM HYDROGEN CARBONATE CRYSTAL GRAIN AND PROCESS FOR PRODUCING THE SAME

摘要

Sodium hydrogencarbonate crystal particles excellent in anti-caking property and anti-thermal decomposition property, and their production process, are provided. Sodium hydrogencarbonate crystal particles whose color 1 second after dropping of a phenolphthalein solution having a predetermined composition, is R=245 to 255, G=243 to 255 and B=245 to 255 in RGB 256 tone notation. The sodium hydrogencarbonate crystal particles are produced by subjecting sodium hydrogencarbonate crystal particles to a bicarbonation treatment in a humidified carbon dioxide gas atmosphere.