To provide a method for producing a granular anionic surfactant, capable of producing its granular material which has good color tones, external appearance and solubility, is decreased in a water content as a powdery material, scarcely causes caking, and has good handleability, in an optimal particle diameter range, by using a drying apparatus of a small scale having a decreased drying load, and without causing heat deterioration of the surfactant.
This method for producing the granular anionic surfactant comprises simultaneously conducting drying and granulation in a granulating machine having an agitating blade and a crushing blade, while adding anionic surfactant paste to a powdery raw material under reduced pressure, so that the granular material containing the anionic surfactant in an amount of 80-99.5 wt% is obtained. The granular anionic surfactant is obtained by this method. A detergent composition and an additive for cement contain the granular anionic surfactant, respectively.
YAMASHITA HIROYUKI
SAKUMA YASUMITSU
MIYOSHI KAZUHITO
Takahiko Mizobe
Shinji Mochida
Yoshitsune Kazumasa