Method for preparing a monodispersed double emulsion

B - Operations – Transporting – 01 – F

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B01F 3/08 (2006.01)

Patent

CA 2408419

The invention concerns a method for preparing a monodispersed double water/oil/water emulsion, characterised in that it consists in: a) subjecting a polydispersed oil-in-water emulsion Ei comprising 55 to 99 wt. % of an aqueous phase, to a controlled shearing so that a common maximum shearing is applied to the entire emulsion, so as to obtain the corresponding monodispersed invert emulsion; b) adding to said emulsion, without phase inversion, the necessary amount of diluting oil phase so that the aqueous phase of the resulting emulsion represents at least 50 wt. % of the emulsion total weight; and c) introducing the resulting emulsion into a high pressure homogenizer, together with a continuous aqueous phase, the respective amounts of said emulsion and said continuous aqueous phase being such that the resulting double emulsion comprises up to 50 wt. % of invert emulsion droplets relative to the emulsion total weight, said continuous aqueous phase comprising a hydrophilic surfactant concentration not more that 0.02 times the critical micellar concentration.

La présente invention concerne un procédé de préparation d'une émulsion double monodisperse, de type eau dans huile dans eau et qui évite le problème de l'art antérieur, à savoir la destruction de l'émulsion double. L'invention résout ce problème notamment en utilisant un homogénéisateur haute pression. De façon générale, le procédé comprend les étapes consistant à: soumettre une émulsion Ei de type eau dans huile, polydisperse, à un cisaillement contrôlé de telle sorte qu'un même cisaillement maximal soit appliqué à l'ensemble de l'émulsion; b) ajouter à l'émulsion, sans inversion de phase, la quantité nécessaire d'une phase huileuse de dilution de façon à ce que la phase aqueuse de l'émulsion résultante représente moins de 50% en poids du poids total de l'émulsion; c) et introduire l'émulsion résultante dans un homogénéisateur haute pression, ensemble avec une phase aqueuse continue comprenant une concentration en tensioactif hydrophile inférieure ou égale à 0.02 fois la concentration micellaire critique.

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