Abstract
An organic photochemical was crystallized in batches-wise both in laboratory and industrial crystallizers. In the laboratory, crystals were produced at different stirring speeds using a 1 L crystallizer, and the centrifugal filtration tests were conducted for the slurries that were obtained slurries. The average specific resistance was reduced much more than expected from the Kozeny-Carmann equation. This suggested that the a change occurred in the channel structure occurred in the cake composed of the crystalline particles that were obtained. Based on the above laboratory tests, batch crystallization with a low-speed intermittent stirring technique was applied for an actual crystallizer. The filtration time was reduced in the actual plant to about 1/10 of that of the previous conventional stirring crystallization.
