Spray-drying process

Details Spray-drying process Spray-drying process

2009-06-08

2010-11-30

Douyon, Lorna M (Department: 1796)

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

Heterogeneous arrangement

C510S452000

Reexamination Certificate

active

07842657

ABSTRACT:
The present invention relates to a process for preparing a spray-dried powder comprising(i) anionic detersive surfactant;(ii) from 0 wt % to 10 wt % zeolite builder;(iii) from 0 wt % to 10 wt % phosphate builder; and(iv) optionally from 0 wt % to 15 wt % silicate salt;wherein the process comprises the steps of:(a) forming an alkaline slurry in a mixer, the slurry having a viscosity of from X to Y s−1at a temperature of 70° C. and at a shear rate of 50 s−1, wherein the alkaline slurry is shear thinning; and(b) transferring the alkaline slurry from the mixer through at least one pump to a spray pressure nozzle;(c) contacting a viscosity increasing agent to the alkaline slurry after the mixer and before the spray pressure nozzle so as to increase the viscosity of the alkaline slurry to form a viscous alkaline slurry, step (c) being carried out at an average shear rate of from 10 s−1to 150 s−1;(d) spraying the viscous alkaline slurry through the spray pressure nozzle into a spray-drying tower;(e) spray-drying the viscous alkaline slurry to form a spray-dried powder; and(f) optionally, contacting an alkalinity source with the alkaline slurry and/or the viscosity increasing agent, and/or the viscous alkaline slurry.

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patent: 273688 (1991-09-01), None
patent: WO 96/03488 (1996-02-01), None
PCT International Search Report, dated Sep. 16, 2009—7 pgs, (PCT/US2009/047298).

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