Patent ID: 7732396

Claim:
A process for producing granular anionic surfactant particles, which comprises: a step of stirring particles in a granulator, said particles comprising 90 to 100 wt % of an anionic surfactant at a temperature of 35 to 85° C. at a stirring Froude number as defined below by equation (i) being 0.1 to less than 2.0: Fr=V /[( R×g ) 0.5 ] (i) wherein Fr is Froude number, V is a peripheral speed at the top of a stirring blade [m/s], R is the radius of gyration of a stirring blade [m] and g is the acceleration of gravity [m/s 2 ], wherein the granulator has a clearance of from 1 to 50 mm between the stirring blade and the wall surface of the granulator, and wherein said anionic surfactant is selected from the group consisting of an alkyl sulfate, alkenyl sulfate, alkyl ether sulfate and alkenyl ether sulfate; and a step of producing said granular particles having 90 to 100% anionic surfactant content.