| abstract |
The present invention relates to a spray-drying process for the preparation of a spray-dried detergent powder having a bulk density of 426 g/l or less, wherein the spray-dried detergent powder comprises an anionic detersive surfactant and from 0 wt % to 10 wt % zeolite builder and from 0 wt % to 10 wt % phosphate builder, and wherein the process comprises the step of: (a) preparing an aqueous slurry suitable for spray-drying comprising from 30 wt % to 60 wt % water and from 40 wt % to 70 wt % non-aqueous material, wherein the non-aqueous material comprises an inorganic component and an organic component, wherein the weight ratio of the inorganic component to organic component is in the range 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 tower is in the range of from 65° C. to 140° C., and wherein the outlet air temperature of the spray-drying tower is in the range of from 70° C. to 120° C. |