Stable double emulsions containing finely-divided particles

Details Stable double emulsions containing finely-divided particles Stable double emulsions containing finely-divided particles

B - Operations, Transporting

01

J

B01J 13/00 (2006.01) A01N 25/04 (2006.01) A01N 25/06 (2006.01) C09D 5/02 (2006.01)

Patent

CA 2112371

2112371 9300007 PCTABS00019 A preferred method of producing an aqueous, stable double emulsion is disclosed. The first step of the method is the production of an "inner" emulsion. The inner emulsion is produced by combining water, a liquid hydrocarbon solvent, and an emulsifier, in an agitated mixing vessel, along with an effective amount of finely-divided particulate material, to produce an oil-in-water emulsion having a viscosity of no more than about 200,000 centipoises, wherein the finely-divided particulate material is substantially homogeneously-dispersed throughout the thus-produced oil-in-water emulsion. The second step of the method is the production of an "outer" emulsion. The outer emulsion is produced by combining a liquid hydrocarbon solvent, water, and an emulsifier, in an agitated mixing vessel, to produce a water-in-oil emulsion. The third step of the method is the production of a "dual" emulsion. The dual emulsion is produced by combining the water-in-oil emulsion with an effective amount of the oil-in-water emulsion, in a mixing zone, thereby to produce the aqueous, stable double emulsion.

Enter the French Abstract here.L'invention concerne un procédé préféré de production d'une double émulsion aqueuse stable. La première étape du procédé consiste en la production d'une émulsion "intérieure". On produit l'émulsion intérieure en combinant de l'eau, un solvant d'hydrocarbure liquide ainsi qu'un émulsifiant dans une cuve de mélange agité, avec une quantité efficace de matière particulaire finement divisée afin de produire une émulsion aqueuse dont la viscosité ne dépasse environ 200.000 centipoises, ladite matière particulaire finement divisée étant dispersée de manière homogène dans l'émulsion aqueuse ainsi produite. La seconde étape du procédé consiste en la production d'une émulsion "extérieure". On produit ladite émulsion extérieure en combinant un solvant hydrocarbure liquide, de l'eau, ainsi qu'un émulsifiant dans une cuve de mélange agitée, afin de produire une émulsion huileuse. La troisième étape du procédé consiste en la production d'une "double" émulsion. On produit la double émulsion en combinant l'émulsion huileuse avec une quantité effective de l'émulsion aqueuse, dans une zone de mélange, afin de produire ainsi la double émulsion aqueuse stable.

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