The main advantage of the vacuum crystallizer is that it can reach very low temperatures and can get larger crystals. The vacuum crystallizer has a simple overall structure, reasonable structural design, no moving parts, and is a high-efficiency crystallization equipment. The temperature of the material is controllable. Its unique structure and working principle determine its high heat transfer efficiency, simple configuration and convenient operation and control. The operating environment is good and so on.
The inner and outer walls of the vacuum crystallizer are polished, which can effectively reduce the crusting of the material on the inner wall. Moreover, the crystal slurry has uniform supersaturation, good particle size distribution, high efficiency, low relative energy consumption, and continuous production of the lower discharge valve. Vacuum crystallization is actually a crystallization method in which a solution is flash evaporated under vacuum and adiabaticly cooled.
In essence, the vacuum crystallizer crystallizes mainly by simultaneously concentrating and cooling to produce supersaturation. The vacuum cooling crystallization operating conditions are: vacuum degree 2000-4000 Pa, average crystallization stop time 1.5~2.0 h, cooling end temperature 30-35 °C. Vacuum-cooled crystallization has significant advantages in the mid-high temperature range, but at temperatures below 40 °C, the energy consumption amplitude will increase significantly.