Abstract
The measurement of supersaturation is important in the operation of crystallization processes, because it is a key factor to control crystal size distribution and shape which determine product quality. A monitoring system of the supersaturation using a quartz crystal sensor is applied to the supersaturation measurement. From the sudden drop of resonant frequency, the beginning of the formation of salt crystal on the sensor surface is determined while the sensor is directly cooled. The degree of supersatuation is computed from the temperature difference between the salt solution and the sensor at the moment. The performance of the supersaturation measurement is examined applying the sensor system to three different salt solutions. The experimental outcome, observational determination and photographic comparison indicate that the proposed measurement system is effective and useful to determine the supersaturation in the crystallization process.
