The vacuum cooling crystallizer is a kind of crystallization equipment. During the crystallization process of the solution, the temperature of the material in the vacuum crystallizer can be controlled. The principle of the vacuum crystallizer determines that the vacuum crystallizer has high heat transfer efficiency, simple configuration, convenient operation and control, and is easy to operate. Good environment and other characteristics.
Working principle
The working principle of the vacuum cooling crystallizer is to cool down and crystallize the material solution through vacuuming. It is a commonly used equipment in the current industrial crystallization process.
The raw material solution of the vacuum crystallizer is mostly preheated by a heater outside the device and then injected into the crystallizer. When entering the vacuum evaporator, a flash evaporation effect occurs immediately, and the steam can be pumped away in an instant, and then the cooling process begins. When a stable state is reached, the temperature of the solution is balanced with the saturated steam pressure.
Vacuum crystallization essentially relies on concentration and cooling to produce supersaturation and crystallize.
Operating conditions of vacuum crystallizer
The operating conditions of vacuum cooling crystallization are: vacuum degree 2000-4000 Pa, average crystallization stop time 1.5~2.0 h, cooling end temperature 30-35°C.
Vacuum cooling crystallization has significant advantages in the medium and high temperature range, but below 40°C, the energy consumption will increase significantly.
The solution has a relatively low boiling point under negative pressure conditions and can be operated without excessive temperature. The boiling point of the solution decreases as the degree of vacuum increases, making the crystallization method of flash evaporation of the solution under vacuum more suitable for vacuum crystallizers.
Cooling and crystallizing materials by vacuuming is the preferred cooling method for industrial continuous crystallizers.
When a high-temperature solution is put into a vacuum crystallizer, the lowering of the boiling point will cause the solution to boil violently and emit water vapor. Even a small amount of water vaporized can take away a considerable amount of heat, causing the temperature of the crystallization solution to drop rapidly. The solution temperature Reducing the achievable extreme depends on the degree of vacuum we can achieve in the vacuum crystallization system.
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