Continuous evaporation crystallization system and method for one-step production of large-size food-grade potassium chloride crystals

Abstract

The present invention relates to a continuous evaporation and crystallization system and method for producing large-grain food-grade potassium chloride crystals in one step. The system is composed of two parts: an evaporation system and a crystallization system, and can continuously realize the production of large-grain food-grade potassium chloride in one step. The method includes: The potassium chloride solution is heated and concentrated through the evaporation system, and then pumped to the crystallization system for continuous evaporation and crystallization to obtain the potassium chloride crystal slurry. After the crystal growth is completed, the potassium chloride crystal slurry is discharged and transported to the buffer tank; the conditions include: The feed potassium chloride feed liquid directly enters the circulation pipeline of the separation chamber, mixes with a large amount of potassium chloride concentrated liquid, forms a high-temperature and high-saturated solution through two-effect heat exchange, and then mixes it with a large amount of potassium chloride crystal slurry, and exchanges heat through an external circulation Raise the temperature and pressure of the potassium chloride material, send it to the crystallizer for flash evaporation and concentration, and crystallize and precipitate potassium chloride crystals. According to the method provided by the invention, the obtained food-grade potassium chloride crystal has a large average particle size, uniform particle size distribution and high yield.

Description

technical field [0001] The invention belongs to the technical field of evaporation crystallization, and in particular relates to a continuous evaporation crystallization system and method for producing large-diameter food-grade potassium chloride crystals in one step. Background technique [0002] Food grade potassium chloride is white powder or colorless crystal, odorless, salty, non-toxic, easily soluble in water, soluble in glycerin, slightly soluble in ethanol. Food-grade potassium chloride is mainly used to produce low-sodium salt to meet the direct potassium supplement of the human body. It is used as a salty agent and nutritional supplement to partially replace salt to prevent people from excessive intake of salt; it can be used for oral administration in medicine, and can also be used to prepare water for injection. It plays the role of supplementing or balancing the potassium deficiency of the human body, and it can also make diuretics and prevent potassium deficien...

AI Technical Summary

Problems solved by technology

With the continuous expansion of the scale of industrialization, the equipment and manual operation required for the food-grade potassium chloride crystallization process are relatively large. Due to the influence of unstable factors in manual operation, it is easy to cause the edible potassium chloride crystal product to have small crystals, uneven particle size distribution, The serious coalescence of crystal products makes it more difficult to separate, wash and dry in subsequent processes, and cannot meet the requirements of food potassium chloride manufacturers for the particle size and purity of potassium chloride products

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