A Continuous Vacuum Cooling and Crystallization Device with Lifting Guide

Abstract

The invention discloses a continuous vacuum cooling and crystallization device with a lift guide, which comprises a crystallization chamber, a guide cylinder, a lift cylinder, a forced circulation stirrer, 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 of the crystallization chamber, and the slurry return pipe of the slurry return circulation system is connected with the bottom of the crystallization chamber. The hot material enters from the two hot material inlets at the bottom of the crystallization device, is lifted in the lifting cylinder by the forced circulation agitator, and then vacuum flashes near the liquid level. After flashing, the mother liquor and crystal nuclei enter the lower part of the crystallization chamber along the guide tube to grow crystals Crystal cultivation, the bottom slurry reflux system forms a partial reflux of the slurry. The invention utilizes the internal lifting diversion structure to increase the reaction residence time, reduce the problems of low production efficiency, supersaturation cannot be effectively controlled, and easy fouling in the external circulation heat exchanger and circulation pipe in conventional intermittent production. While producing, the solid content in the crystallization device is effectively maintained, the operation of the equipment is stable, and the cleaning cycle is extended.

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

Images