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Method for producing high-purity ammonium chloride from industrial-grade ammonium chloride

An ammonium chloride, industrial-grade technology, applied in the field of purification of industrial-grade ammonium chloride, can solve problems such as being unable to be used directly and failing to meet requirements, and achieve the effects of reducing environmental protection pressure, reducing the generation of by-products, and simplifying the process flow

Pending Publication Date: 2020-12-29
湖北兴福电子材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above three methods not only produce waste liquid and put a certain pressure on the environment, but also the metal ions in the ammonium chloride after treatment are still as high as 50ppm and above, which still cannot meet the requirements in the electronic industry and cannot be used directly.

Method used

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  • Method for producing high-purity ammonium chloride from industrial-grade ammonium chloride
  • Method for producing high-purity ammonium chloride from industrial-grade ammonium chloride
  • Method for producing high-purity ammonium chloride from industrial-grade ammonium chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Take 800g of deionized water, weigh 524.8g of industrial grade ammonium chloride according to the solubility of ammonium chloride at 80°C, place the beaker containing deionized water and ammonium chloride in a constant temperature water bath and heat it to 80°C ℃, and kept stirring to completely dissolve the ammonium chloride to obtain a saturated ammonium chloride solution;

[0046] (2) Place the saturated ammonium chloride solution at room temperature and slowly cool down to crystallize the ammonium chloride. When the temperature reaches room temperature, put it into a low-temperature constant temperature water bath to continue crystallization until the temperature reaches 5° C.;

[0047] (3) The ammonium chloride crystallized in step (2) is kept at the crystallization temperature and filtered through a sand core funnel to obtain ammonium chloride crystals, and the ammonium chloride mother liquor obtained by filtering is collected for processing;

[0048] (4) The ...

Embodiment 2

[0053] The steps are the same as in Example 1, except that the washing time in steps (4) and (6) is 3 minutes.

Embodiment 3

[0055] The steps are the same as in Example 1, except that the washing time in steps (4) and (6) is 5 minutes.

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Abstract

The invention discloses a method for producing high-purity ammonium chloride from industrial-grade ammonium chloride. According to the method industrial-grade ammonium chloride is used as a raw material, and the method comprises: removing metal ions such as potassium, sodium, magnesium, iron and the like by twice crystallization leaching according to different solubility and different solubility changes of ammonium chloride salt and other metal chlorides at different temperatures, then heating and concentrating by steam to obtain ammonium chloride with higher purity, and purifying the treatedammonium chloride again through cation exchange resin, so that the content of metal ions in the ammonium chloride is lower than 100 ppb, and the grade of the ammonium chloride which can be applied toelectronic-grade products is achieved. According to the treatment method, the yield of ammonium chloride can reach 80-90%, no new chemical substance is introduced in the treatment process, no new pollutant is brought to an original ammonium chloride system, meanwhile, collected leacheate and filtered mother liquor are collected, finally low-grade ammonium chloride is obtained and used for fertilizer and other industries, and application of resources is maximal.

Description

technical field [0001] The invention relates to a purification method of industrial-grade ammonium chloride, in particular to a method for removing metal ions of industrial-grade ammonium chloride. Background technique [0002] As an important source of nitrogen, ammonium chloride has important applications in agriculture and has low requirements for metal ions. However, in the application of the electronic industry, the metal ions contained in it, such as potassium, sodium, calcium, magnesium, iron, etc., will have a great impact on the products of the applied industry. [0003] At present, the methods for removing metal ions in ammonium chloride include organic solvent extraction, adding other chemical substances for chemical reaction and ion exchange. [0004] Organic solvent extraction and addition of other chemical substances reacted to remove metal ions in ammonium chloride. This method introduces a new chemical substance, which is likely to cause pollution to the or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16C05C3/00
CPCC01C1/164C01P2006/80C05C3/00
Inventor 王书萍郝晓斌贺兆波张庭冯凯尹印万杨阳钟昌东李鑫
Owner 湖北兴福电子材料股份有限公司
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