A process for preparing a composition determined gent and bleaching

摘要

In a process for preparing a detergent and bleaching composition comprising a detergent, a builder, a percompound bleach, an organic activator for the percompound bleach and ethylene diamine tetra-(methylene phosphonate) -EDTMP-, by spray-drying an aqueous detergent slurry comprising the detergent and builder in a spray-drying tower, followed by dry-mixing the dried powder with the percompound and the activator, the improvement being that a separate aqueous EDTMP-slurry comprising calcium hydroxide is spray-dried simultaneously with the main aqueous detergent slurry in the same spray-drying tower via a separate nozzle system at about the same level as the main detergent nozzle system or lower.