SODIUM HYPOCHLORITE PENTAHYDRATE CRYSTAL POWDER, PRODUCTION METHOD THEREFOR, AND AQUEOUS SOLUTION OF SODIUM HYPOCHLORITE USING SAME

摘要

The present invention relates to a production method for sodium hypochlorite pentahydrate crystal powder, the method comprising: drying wet sodium hypochlorite pentahydrate crystals with a gas until the moisture content of the crystals reaches 2.5% by weight or lower,wherein the gas has a temperature of less than 25°C, a dew point of -2°C or lower, and a carbon dioxide concentration of 250 ppm to 1600 ppm, and wherein the wet sodium hypochlorite pentahydrate crystals have a sodium hydroxide concentration of 0.01% by weight or higher.;The present invention also relates to a sodium hypochlorite pentahydrate crystal powder, the powder comprising sodium carbonate, wherein the sodium carbonate is present on surfaces of the sodium hypochlorite pentahydrate crystals, and wherein the powder has a sodium carbonate concentration of 0.1% by weight or more and a moisture content between crystals of 2.5% by weight or less.