Storage-stable aerated gel composition and a process for...

Details Storage-stable aerated gel composition and a process for... Storage-stable aerated gel composition and a process for...

B - Operations, Transporting

01

J

B01J 13/02 (2006.01) C01B 33/18 (2006.01) C01B 33/152 (2006.01)

Patent

CA 2390107

A storage-stable aerated gel composition comprises 30 to 97 % by weight of water, 0.2 to 5 % by weight of a gelling agent selected from xanthan gum, sodium alginate and neutralised carboxyvinyl polymer and 2 to 5 % by weight of a fine particulate, hydrophobic silicone-treated silica having a surface area of from 80 to 300 m2/g. The composition is in the form of fine particles of an aqueous gel containing the water and gelling agent, the surfaces of which fine particles are coated with a coating of the finely particulate hydrophobic silica. The gel composition is prepared by mixing, under high shear conditions, the water and the fine particulate silica and then adding, to the resulting mixture, the gelling agent and mixing under high shear conditions.

Cette composition de gel aéré, de longue conservation, comprend 30 à 97 % en poids d'eau, 0,2 à 5 % en poids d'un agent gélifiant choisi dans le groupe constitué par de la gomme xanthane, de l'alginate de sodium et un polymère carboxyvinylique neutralisé, ainsi que 2 à 5 % en poids d'une silice particulaire, traitée à la silicone, hydrophobe et comprenant une surface utile comprise entre 80 et 300 m<2>/g. Cette composition se présente sous la forme de particules fines d'un gel aqueux contenant de l'eau et l'agent gélifiant, les surfaces de ces particules étant enrobées d'un revêtement constitué de la silice hydrophobe à fines particules. On prépare cette composition de gel en mélangeant, dans des conditions de cisaillement élevé, l'eau et les fines particules de silice, puis en ajoutant au mélange résultant l'agent gélifiant, et enfin en mélangeant à nouveau dans des conditions de cisaillement élevé.

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