A SPRAY-DRYING PROCESS FOR PREPARING A LOW DENSITY, LOW BUILDER, HIGHLY WATER-SOLUBLE SPRAY-DRIED DETERGENT POWDER

摘要

The present invention relates to a spray-drying process for the preparati on of a spray- dried detergent powder having a bulk density of 426g/l or les s, wherein the spray-dried detergent powder comprises an anionic detersive s urfactant and from 0wt% to 10wt% zeolite builder and from 0wt% to 10wt% phos phate builder, and wherein the process comprises the step of: (a) preparing an aqueous slurry suitable for spray-drying comprising from 30wt% to 60wt% w ater and from 40wt% to 70wt% non-aqueous material, wherein the non-aqueous m aterial comprises an inorganic component and an organic component, wherein t he weight ratio of the inorganic component to organic component is in the ra nge of from 0.3: 1 to 5: 1; and (b) spraying the slurry into a spray-drying tower, wherein the temperature of the slurry as it enters the spray-drying t ower is in the range of from 65°C to 140°C, and wherein the outlet air tempe rature of the spray-drying tower is in the range of from 70°C to 120°C.