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Production method of high-purity food-grade potassium chloride

A production method and technology of potassium chloride, applied in chemical instruments and methods, lithium halide, inorganic chemistry, etc., can solve problems such as complex process flow, high energy consumption, and increased cost, and achieve simple process flow, stable chemical properties, The effect of low running cost

Inactive Publication Date: 2017-03-15
江苏润普食品科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, the multi-stage crystallization method is used for impurity removal. Although this method can produce potassium chloride that meets the quality requirements, the production cost is high, the energy consumption is high, and the production cannot be continuous, resulting in low yield. The crystal particles of potassium chloride are small and uneven. easy to agglomerate
Although there are many patents to continuously improve the evaporation and crystallization process and devices, which reduces the energy consumption of producing potassium chloride and improves the product quality, but the process is relatively complicated, and some of them have added chemical anti-caking to prevent product agglomeration. block, resulting in limited product application
[0004] CN 105668592A discloses a production method of low-sodium high-purity potassium chloride. In order to strictly control the content of impurity ions such as calcium, magnesium and sodium in the mother liquor, fresh saturated potassium chloride solution is continuously replenished during the crystallization process. The process is complicated, the output of the product is low, the cost is high, and the impurity ions cannot be well controlled within a certain range, the product quality is unstable, and the effect is average
CN 105060315A discloses a method for producing food-grade potassium chloride using an adsorption process, including processes such as dissolving, filtering, multi-stage macroporous resin adsorption purification, activated carbon adsorption, concentrated crystallization, solid-liquid separation, and drying. Purification, combined with activated carbon to remove octadecylamine, dodecylmorphine and 2# oil in industrial potassium chloride, and to remove heavy metals such as sodium ions, magnesium, calcium ions, etc., is to form a precipitate by adding new substances to the system After filtration, this simple treatment cannot control the content of sodium ions and heavy metal ions in potassium chloride products in a low range, not only can not meet the requirements of edible potassium chloride, but also to remove new substances added to impurities, so that the entire process flow complex, costly

Method used

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  • Production method of high-purity food-grade potassium chloride

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put potassium chloride with a content (weight content) ≥ 96% into the dissolving tank at room temperature, dissolve under stirring to obtain a potassium chloride solution, store the solution in a buffer tank after filtering through a filter, and pump the potassium chloride solution into Weakly acidic cation exchange resin column for adsorption, flow control 10m 3 / h, the pH is controlled at 11, the replacement time is 0.5h, the absorbed potassium chloride solution is sent to the crystallizer, and concentrated crystallization is carried out at a temperature of 120°C, and the crystallized potassium chloride slurry is discharged into the centrifuge for further In the dehydration operation, the centrifuged mother liquor is transported to the dissolution tank for recycling. After the potassium chloride product after centrifugal dehydration is through fluidized bed drying, obtains the edible grade potassium chloride of purity ≥ 99.1%, wherein sodium content is 0.3%, heavy met...

Embodiment 2

[0023] Put potassium chloride with a content (weight content) ≥ 96% into the dissolving tank at room temperature, dissolve under stirring to obtain a potassium chloride solution, store the solution in a buffer tank after filtering through a filter, and pump the potassium chloride solution into Strongly acidic cation exchange resin column for adsorption process, flow control 25m 3 / h, the pH is controlled at 9, the replacement time is 2.0h, the absorbed potassium chloride solution is sent to the crystallizer, concentrated and crystallized at a temperature of 120°C, and the crystallized potassium chloride slurry is discharged into the centrifuge for further In the dehydration operation, the centrifuged mother liquor is transported to the dissolution tank for recycling. After the potassium chloride product after centrifugal dehydration is through fluidized bed drying, obtains the edible grade potassium chloride of purity ≥ 99.5%, wherein sodium content is 0.2%, and heavy metal co...

Embodiment 3

[0025] Put potassium chloride with content (weight content) ≥ 96% in the dissolving tank at room temperature, dissolve under stirring to obtain potassium chloride solution, store in the buffer tank after the solution is filtered through a filter, use the potassium chloride solution pump Into the strong acidic cation exchange resin column for adsorption process, flow control 15m 3 / h, the pH is controlled at 11, the replacement time is 2.0h, the absorbed potassium chloride solution is sent to the crystallizer, and concentrated crystallization is carried out at a temperature of 70°C, and the crystallized potassium chloride slurry is discharged into the centrifuge for further In the dehydration operation, the centrifuged mother liquor is transported to the dissolution tank for recycling. After the potassium chloride product after centrifugal dehydration is through fluidized bed drying, obtains the edible grade potassium chloride of purity ≥ 99.3%, wherein sodium content is 0.2%, ...

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Abstract

The invention discloses a production method of high-purity food-grade potassium chloride. The production method comprises the steps of dissolving, filtering, adsorption and purification with ion exchange resin, concentration crystallization, centrifugal separation, and drying, wherein the high-purity food-grade potassium chloride is obtained after impurities are removed by virtue of the adsorption of the ion exchange resin. Industrial potassium chloride is purified by virtue of the adsorption and purification of the ion exchange resin to produce the food-grade potassium chloride. The ion exchange resin is high in processing capacity, capable of selectively removing sodium ions and heavy metal ions, reusable, long in service life, and relatively low in operation expense. The process flow is simple, and top-grade potassium chloride with large and uniform particles can be obtained.

Description

technical field [0001] The invention relates to a production method of high-purity food-grade potassium chloride, which belongs to the field of chemical manufacturing. Background technique [0002] Food grade potassium chloride is colorless elongated rhombohedral or cubic crystal or white crystalline powder, odorless, salty, soluble in water, soluble in glycerin, slightly soluble in ethanol. With the improvement of people's living standards, there is an increasing need for high-grade refined potassium chloride, especially food-grade and pharmaceutical-grade potassium chloride. Sodium ions and heavy metals in industrial potassium chloride have a great impact on product quality. For example, there are a large number of salt lakes in the Qaidam area of ​​Qinghai Province, especially the salt lake brine in the Chaerhan area is a chloride-type brine, which produces a large amount of carnallite. When local enterprises adopt the conventional flotation method to produce potassium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/04
CPCC01D15/04C01P2006/80C01D3/145
Inventor 熊新国王虎臣刘宗飞梁艳芳赵茂明
Owner 江苏润普食品科技股份有限公司