Linear Cooling of Sodium Sulfate Batch Crystallization

Abstract

To obtain a unimodal crystal size distribution, linear cooling of a batch crystallizer was experimentally examined. Sodium sulfate, which has a relatively large heat of crystallization, was crystallized.
The condition for batch crystallizer operation within the metastable region was derived: the product of temperature derivative of solute saturation concentration and cooling rate must be less thana certain value.
Experiments were carried out with cooling rate satisfying the operation condition. A nearly uni-modal product of sodium sulfate was obtained.