Method and device precipitation of a solute

A precipitator comprises a circulation against the current between the reactants (8, 6, 7 -> 12) and an organic phase containment (10-> 9) immiscible and chemically inert to maintain the phase containing the reagent into an emulsion. The precipitator walls are hydrophobic to avoid sticking of the precipitate. The emulsion is maintained by a movable body (2) stirrer. The precipitate is continuously removed by a scavenging flow device (16).