A method and device of preparing an emulsion comprising a first liquid and a second liquid, said method comprising the step of dispersing the first liquid into the second liquid, characterized in that the method comprises:—passing the first liquid through an injection nozzle (108) for creating a spray of droplets of the first liquid, and—injecting thus created droplets of first liquid into the second liquid such that Q, where Q is equal to the square of the speed of the droplets, is at least 225 m2/s2; wherein W, wherein W is sg*Q*d divided by St with sg being the specific gravity of the first liquid in kg/m3, d being the mean Sauter droplet diameter in meter of the spray leaving the injection nozzle in air, and St being the surface tension of the first liquid in Newton/meter; is at least 250 kg*m/N*s2.