Patent ID: 7407639

Claim:
A method of preparing particles of a defined size, the method comprising: providing a reaction vessel having a first reactant space and a second reactant space, the spaces being separated by a contactor; introducing a first liquid reactant in the first reactant space; introducing a second liquid reactant in the second reactant space; rotating the reaction vessel so that the first reactant space is radially inside and the second reactant space is radially outside; forming first reactant droplets when the first reactant passes the contactor under influence of a centrifugal force caused by the rotating of the reaction vessel; transporting the droplets of the first reactant to the second reactant in the second reactant space under influence of the centrifugal force; forming a reaction product in the form of particles when the first reactant has been brought into contact with the second reactant, the reaction product having a density that is greater than that of the second reactant; and transporting the reaction product particles to a radially outward end of the second reactant space due to centrifugal forces.