Process for forming a low density detergent granule

C - Chemistry – Metallurgy – 11 – D

Patent

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Details

C11D 3/08 (2006.01) C11D 3/34 (2006.01) C11D 3/37 (2006.01) C11D 11/02 (2006.01)

Patent

CA 2577907

A process for forming a low density detergent granule has the steps of providing from about 0.1% to about 6% of a hydrotrope, providing from about 22% to about 50% crutcher mix moisture, providing from about 0.2% to about 8% of a water- soluble polymer with a molecular weight of at least about 10,000 g/mol, providing from about 2% to about 20% sodium silicate having a SiO2:Na2O ratio of at least about 2:1, and the balance of adjunct crutcher ingredients, mixing the hydrotrope, crutcher mix moisture, polymer, silicate, and adjunct crutcher ingredients in a crutcher to form a slurry, injecting a gas into the slurry at a pressure of from about 6,000 kPa to about 13,000 kPa, and at a rate of from about 0.01% to about 0.25% and forming the slurry into a detergent granule. The slurry is substantially free of zeolite builder and phosphate builder and the crutcher temperature is maintained at from about 40 °C to about 95 °C

L'invention concerne un procédé destiné à former un granule de détergent à faible densité et consistant à utiliser entre environ 0,1% et environ 6% d'un hydrotope, à utiliser entre environ 22% et environ 50% d'une eau de mélange, à utiliser entre environ 0,2% et environ 8% d'un polymère hydrosoluble présentant un poids moléculaire d'au moins environ 10000 g/mol, à utiliser entre environ 2% et environ 20% de silicate de sodium présentant un rapport SiO<SUB>2</SUB>:NaO d'au moins environ 2r, le reste se composant d'ingrédients d'adjonction, à mélanger l'hydrotope, l'eau de mélange, le polymère le silicate et les ingrédients d'adjonction dans un malaxeur en vue de la formation d'une pâte, à injecter un gaz dans cette pâte à une pression comprise entre environ 6000 kPa et environ 13000 kPa et à un taux compris entre environ 0,01% et environ 0,25%, et à former cette pâte en un granule de détergent. Cette pâte est sensiblement exempte d'adjuvant de zéolite et d'adjuvant de phosphate et la température du malaxeur est maintenue à un niveau compris entre environ 40°C et environ 95°C.

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