The DTB crystallizer is a fine slurry circulating crystallizer controlled by PLC for material temperature. The working principle and structure of the DTB crystallizer make the entire equipment highly efficient in heat transfer, simple in configuration, and easy to operate and control.

The DTB crystallizer is widely used in crystallization processes in industries such as chemical, pharmaceutical, and pesticide.

Working principle of DTB evaporative crystallizer

During the operation of the DTB evaporative crystallizer, the hot saturated liquid is continuously added to the lower part of the circulation tube, mixed with the mother liquor containing small crystals in the circulation tube, and then pumped to the cooler.

The cooled bath flows into the crystallizer near the sink and is transported to the liquid surface along the guide tube by a slowly rotating propeller. The solution evaporates and cools at the liquid surface, reaching a supersaturated state, where some solutes deposit on the surface of suspended particles, causing crystal growth. There is also a settling zone around the annular baffle, where large particles settle while small particles enter the circulation pipe with the mother liquor and dissolve under heat.

The crystal sinks into the elution column at the bottom of the crystallizer. In order to make the particle size of the crystallized product as uniform as possible, a portion of the mother liquor from the settling zone is added to the bottom of the elution column, and the hydraulic classification is used to make small particles flow back to the crystallizer with the solution. The secondary crystallized product is discharged from the lower part of the elution leg.

The structural composition of DTB type crystallizer:

The DTB type crystallizer, also known as a guide tube and baffle evaporative crystallizer, is a typical slurry internal circulation crystallizer. It mainly consists of a condenser, blade driver, guide tube, baffle, propeller, heating component, air injector, etc.