Ultrasound has been used for a long time during a phase transition to produce small, uniform crystals. Many theories have been suggested to explain the action of ultrasound in this application. The effect of the initial solvent concentration and the rate of anti-solvent addition on crystal size and supersaturation ratio has also been studied with conventional mixing and ultrasound for an effective comparison. The concentration of the solute in the liquid has been determined using HPLC at 228 nm wavelength to determine the levels of solute supersaturation. The kinetics of dynamic growth of the crystallisation process has been established by measuring the size of the crystal with respect to time. The width of the dynamic meta-stable zone was found by observing the formation of the crystal nuclei indicated by the liquid passing from transparent to slightly turbid. A decrease in the width of the meta-stable zone has been observed due to the application of ultrasound. The study of conventional crystallisation has been carried out at variable impeller speeds of 400, 500, 600 rpm, and ultrasonic crystallisation has been studied on different amplitudes of 40%, 50%, 60% amp using 750 W and 20 kHz . It has been observed that the crystal size distribution is wider in the stirred crystallisation process compared to the ultrasonic assisted operation.