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AssigneeColgate-Palmolive Company
InventorRonald S. Schreiber
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Gelation, setting, and solidification of desirably miscible and pumpable aqueous crutcher slurries of sodium carbonate, sodium bicarbonate and sodium silicate are retarded or prevented by admixing of the sodium silicate component of the medium, as an aqueous solution, concurrently with gaseous carbon dioxide, with a slurry of sodium carbonate and sodium bicarbonate in water. During such addition the pH of the slurry is desirably controlled so as to be about 9.9. Although pressurized liquid carbon dioxide is normally employed as a source of the gas, it is within the invention to utilize solid carbon dioxide (dry ice) or liquid carbon dioxide directly, and pieces, particles and droplets thereof may be added to the crutcher mix, wherein they will vaporize quickly. The crutcher slurries may be spray dried and the resulting products are useful as base materials for absorbing nonionic detergent applied to them in liquid state, to produce a particulate heavy duty synthetic organic detergent composition.
A method of retarding or preventing the gelation of a miscible and pumpable crutcher slurry containing from 40 to 70% of solids and 60 to 30% of water, of which solids content, on a 100% solids basis, 40 to 80% is sodium bicarbonate, 5 to 40% is sodium carbonate and 5 to 25% is sodium silicate of Na.sub.2 O:SiO.sub.2 ratio within the range of 1:1.6 to 1:3, with the ratio of sodium bicarbonate:sodium carbonate being within the range of 2:1 to 8:1 and the ratio of sodium carbonate:sodium silicate being within the range of 1:3 to 3:1, which comprises preparing an aqueous crutcher slurry of the sodium bicarbonate and sodium carbonate, and admixing with such aqueous slurry carbon dioxide and an aqueous solution of the sodium silicate, said carbon dioxide being added in an amount sufficient to prevent said gelation of the slurry.
A method of making a particulate base material in bead form, suitable for absorbing nonionic detergent to make a built heavy duty synthetic organic detergent composition, which comprises making a miscible and pumpable crutcher slurry containing from 40 to 70% of solids and 60 to 30% of water, of which solids content, on a 100% solids basis, 40 to 80% is sodium bicarbonate, 5 to 40% is sodium carbonate and 5 to 25% is sodium silicate of Na.sub.2 O:SiO.sub.2 ratio within the range of 1:1.6 to 1:3, with the ratio of sodium bicarbonate:sodium carbonate being within the range of 2:1 to 8:1 and the ratio of sodium carbonate:sodium silicate being within the range of 1:3 to 3:1, by preparing in a crutcher a slurry of the sodium bicarbonate and sodium carbonate in water, admixing with such slurry an aqueous solution of the sodium silicate and admixing carbon dioxide with the slurry during the admixing of the sodium silicate solution, so as to maintain the pH of the slurry within the range of 9.7 to 10.1 during the addition of the sodium silicate solution and thereby prevent gelation of said slurry, pumping the slurry out of the crutcher in ungelled and readily pumpable state and spray drying the slurry to particulate bead form, during which spray drying a portion of the sodium bicarbonate is converted to sodium carbonate.
Dependencies are inferred from the claim text.