A method for the preparation of crystalline alkaline metal silicates and granular detergents with high bulk density

摘要

The method for producing crystalline alkali metal silicate granules includes the following steps: (1) preparing a mixture comprising: (a) a particular crystalline alkali metal silicate; (b) a nonionic surfactant; and (c) an acid precursor of an anionic surfactant capable of having a lamellar orientation; and (2) granulating by tumbling the mixture obtained in step (1) in an agitating mixer while increasing a bulk density at a temperature sufficiently high enough to neutralize the acid precursor, to thereby give crystalline alkali metal silicate granules having a bulk density of from 0.6 to 1.2 g/ml. The granular detergent composition for clothes washing having high bulk density is obtainable by the above method.