| 摘要 |
PURPOSE: To efficiently obtain a surfactant powder of high concentration with excellent fluidity at elevated temperature, by powdering the concentrate of the aqueous slurry of an anionic surfactant after cooling. CONSTITUTION: At first, a slurry of an anionic surfactant (preferably a salt ofα-sulfo fatty acid alkyl ester) of at least 50wt.% preferably more than 60wt.% concentration is concentrated in a concentrator to bulk material of less than 10%, preferably less than 7% water content. Then, the concentrated bulk is powdered after cooling to 20-70 deg.C, preferably 20-60 deg.C. In the concentration treatment, it is efficient that the slurry is heated to 100 deg.C or higher under atmospheric pressure and flash evaporated in an evaporator under reduced pressure. It is more desirable to pelletize the cooled concentrated bulk in the presence of inorganic particle of less than 20μm average particle size using an extruder and then powdered.
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