Method for preparing capsules consisting of a liquid active...

B - Operations – Transporting – 01 – J

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B01J 13/02 (2006.01) B01J 13/06 (2006.01)

Patent

CA 2349672

The invention concerns a method for preparing mineral capsules consisting of aqueous liquid core enclosed in mineral coating, said method consisting in: 1) emulsifying an aqueous fluid in a phase non-miscible with said aqueous fluid so as to disperse it therein in the form of droplets; 2) contacting, in the resulting emulsion, at least a zirconium, silicon, aluminium and/or a transition metal capable of being hydrolysed or subjected to condensation polymerisation in temperature and pH conditions suitable for forming a precipitate consisting of the corresponding oxide or hydroxide; 3) recuperating the resulting mineral capsules and, if required, purifying them. Said method is characterised in that the formation of the mineral precipitate in the second step is carried out in the presence of an amphiphilic surfactant system present in the emulsion and capable of concentrating the deposit of mineral particles of said precipitate formed in the interface of the aqueous droplets and the hydrophobic phase and of effectively blocking their diffusion inside the droplets.

L'invention a pour objet un procédé pour préparer des capsules minérales constituées d'un noyau liquide aqueux entouré d'une écorce minérale, ledit procédé comprenant: 1) la mise en émulsion d'un fluide aqueux au sein d'une phase non miscible avec ledit fluide aqueux de manière à l'y disperser sous forme de gouttelettes, 2) la mise au contact, au sein de l'émulsion ainsi obtenue, d'au moins un composé hydrolysable et polycondensable de zirconium, silicium, aluminium et/ou un métal de transition dans des conditions de température et de pH propices à la formation d'un précipité constitué de l'oxyde ou l'hydroxyde correspondant et 3) la récupération des capsules minérales ainsi formées et le cas échéant leur purification, ledit procédé étant caractérisé en ce que la formation du précipité minéral dans la seconde étape est conduite en présence d'un système tensioactif amphiphile, présent au niveau de l'émulsion et capable de concentrer le dépôt des particules minérales dudit précipité formé à l'interface des gouttelettes aqueuses et de la phase hydrophobe et de bloquer efficacement leur diffusion au sein desdites gouttelettes.

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