To produce a powder soap having a high bulk density and good solubility in cold water by a simple and industrially efficient process reduced in energy consumption.
In producing a powder soap by mixing and neutralizing 1-10 equivalents of a solid water-soluble alkali inorganic compound with 1 equivalent of a fatty acid, the fatty acid in an amount 0.2-0.3 time as large as the total amount of the acid to be added is added to the solid water-soluble alkali inorganic compound kept it in a powdery state by agitation, the temperature of the mixture is kept at 40-90°C, the mixture is agitated to keep it in a powdery state, and the remainder (0.7-0.8 time the total amount of the acid to be added) of the fatty acid is added over a period of time of 10min or longer.
TSURUGIDA YUUJI
YAMADA MUNEHIRO
KATSUTA YUTAKA
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