Continuous vacuum cooling crystallization device with lifting diversion

Abstract

The invention discloses a continuous vacuum cooling crystallization device with lifting diversion, comprising a crystallization chamber, a guide cylinder, a lifting cylinder, a forced circulation agitator and a slurry reflux circulation system. The guide cylinder and the lifting cylinder are installed inside the crystallization chamber, the forced circulation agitator is installed at the bottom end of the crystallization chamber, and a slurry return tube of the slurry reflux circulation system communicates with the bottom of the crystallization chamber. A hot material enters from two hot material inlets at the bottom of the crystallization device, and conducts vacuumed flash evaporation in the vicinity of the liquid surface after being lifted in the lifting cylinder by the forced circulation agitator. After the flash evaporation, mother liquid and crystal nucleus enter the lower part of the crystallization chamber along the guide cylinder for crystal growth and development, and the bottom slurry reflux system forms a partial reflux of the slurry. The continuous vacuum cooling crystallization device with lifting diversion utilizes an internal lifting diversion structure to increasethe reaction residence time, solves problems in the conventional batch production that the production efficiency is low, the over-saturation cannot be effectively controlled, and an external circulation heat exchanger and a circulation pipe are easy to scale. At the same time, the solid content in the crystallization device is effectively maintained, the equipment operation is stable, and the cleaning cycle is prolonged.

Description

Technical field: [0001] The invention relates to a vacuum cooling crystallization technology, in particular to a continuous production vacuum cooling crystallization device. Background technique: [0002] Cooling crystallization is a separation process in which the solute is precipitated from the solution in the form of crystals by lowering the temperature of the solution system. It is suitable for materials whose solubility decreases significantly with the decrease of temperature. The cooling crystallization device is the core device of the cooling crystallization process. The material in the cooling crystallization device lowers the system temperature through heat exchange, and the solubility of the solute decreases to generate supersaturation, and then crystals are precipitated. The crystals continue to grow under the drive of supersaturation, and finally form a crystalline product. . [0003] The cooling and crystallization process is a process of cooling (heat exchange...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects and deficiencies in the existing cooling and crystallization production process, the present invention provides a continuous vacuum cooling and crystallization device with lifting and diversion. The diversion cylinder with a built-in lifting cylinder is installed in the crystallization chamber to realize continuous cooling during the lifting and diversion process. Crystallization, which combines vacuum flash cooling without refrigerant and controllable solid content in the crystallization device to solve the problems caused by traditional equipment due to scaling on the inner wall of the jacket and the outer wall of the inner refrigerant circulation pipe, as well as scaling and blockage of the heat exchanger Problems such as short operation cycle and frequent need to stop production for cleaning

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