Inversely feeding ammonium chloride producing process in serial system

A technology of ammonium chloride and reverse feed, applied in the direction of ammonium halide, etc., can solve the problems of easy to produce defective products, the quality of ammonium chloride is average, and the inability to produce refined ammonium, so as to achieve the effect of increasing production and improving the quality of agricultural ammonium products

Inactive Publication Date: 2003-05-14
TIANJIN BOHUA YONGLI CHEM IND
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0002] Compared with the combined process of ammonium chloride production in the traditional combined soda production process, the reverse material process has good operational stability, and more salt can be added in the system, which can reduce the mother liquor equivalent and increase the ammonium chloride yield. At the same time It can provide high-quality alkali-making mother liquor and ammonia mother liquor II for the alkali-making process, but its disadvantage is that it cannot produce refined ammonium
Combined material process is good at producing refined ammonium while producing agricultural ammonium, but it cannot reflect the above-mentioned advantages of reverse material process
When the two processes coexist, the total output of ammonium chloride is relatively low. Although there are refined ammonium products, the refined ammonium output is relatively low, and the quality of agricultural ammonium chloride is also very general. Defective

Method used

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  • Inversely feeding ammonium chloride producing process in serial system
  • Inversely feeding ammonium chloride producing process in serial system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Send the cold ammonia I mother liquor into two cold crystallizers respectively and cool down to 7°C to precipitate ammonium chloride crystallization through cold analysis, and then take out the solid-liquid apparent volume ratio of 20% in the first cold crystallizer. The slurry is sent into the first thickener for thickening until the solid-liquid apparent volume ratio is 70%, and the thickened crystal slurry can be separated into solid-liquid 1 and dried 1 to obtain refined ammonium products; The clear liquid overflowed from the two cold crystallizers is sent to two salting crystallizers for salting out and mixing. The sodium ion concentration in the mixed liquid is 75tt. Under the action of salting out, the mixed liquid further precipitates ammonium chloride crystals , and then the magma with a solid-liquid apparent volume ratio of 35% in the two crystallizers is sent to the second thickener to be thickened until the solid-liquid apparent volume ratio is 70%, and then ...

Embodiment 2

[0011] Send the cold ammonia I mother liquor into two cold crystallizers respectively, and then cool down to 12°C to precipitate ammonium chloride crystals through cold analysis, and then take out all the solid-liquid apparent volume ratios of 15% in the first cold crystallizer. The magma is sent into the first thickener for thickening until the solid-liquid apparent volume ratio is 70%, and the thickened magma can be separated into solid-liquid 1 and dried 1 to obtain refined ammonium products; The salt and the clear liquid overflowed from the two cold crystallizers are respectively sent to two salting crystallizers for salting out and mixing. The sodium ion concentration in the mixed liquid is 72tt. Under the action of salting out, the mixed liquid further precipitates ammonium chloride crystallization, and then the magma that the solid-liquid apparent volume ratio of taking out in the two crystallizers is 30% is sent into the second thickener together to be thickened until t...

Embodiment 3

[0013] Send the cold ammonia I mother liquor into two cold crystallizers respectively and cool down to 9° C. to precipitate ammonium chloride crystallization, and then take out the solid-liquid apparent volume ratio of 30% in the first cold crystallizer. The slurry is sent into the first thickener for thickening until the solid-liquid apparent volume ratio is 60%, and the thickened crystal slurry can be separated into solid-liquid 1 and dried 1 to produce refined ammonium products; The clear liquid overflowed from the two cold crystallizers is sent to two salting crystallizers for salting out and mixing. The sodium ion concentration in the mixed liquid is 74tt. Under the action of salting out, the mixed liquid further precipitates ammonium chloride crystals , and then the magma with a solid-liquid apparent volume ratio of 45% in the two crystallizers is sent to the second thickener to be thickened until the solid-liquid apparent volume ratio is 60%, and then sent to the second ...

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Abstract

The ammonium chloride producing process in a serial system includes the following steps: feeding cold ammonia mother liquid into two cooling and separating crystallizers to separate ammonium chloride; densifying the crystal slurry of the first cooling and separating crystallizer, solid-liquid separation and drying to obtain refined ammonium chloride; feeding the clear liquid from washing salt andtwo cooling and separating crystallizers into two salt-separating crystallizers, densifying crystal slurry from the two salt-separating crystallizers in a second densifier, mixing the densified crystal slurry with cold ammonia in the second cooling and separating crystallizer; mixing, washing and densifying the crystal slurry from the crystallizer and the mother liquid from the first cooling and separating crystallizer in a third-densifier.

Description

technical field [0001] The invention relates to a method for producing ammonium chloride, in particular to a method for producing ammonium chloride in a combined soda production process. Background technique [0002] Compared with the combined process of ammonium chloride production in the traditional combined soda production process, the reverse material process has good operational stability, and more salt can be added to the system, which can reduce the mother liquor equivalent and increase the ammonium chloride yield. At the same time It can provide high-quality alkali-making mother liquor ammonia mother liquor II for the alkali-making process, but its disadvantage is that it cannot produce refined ammonium. The combined process is good at producing refined ammonium while producing agricultural ammonium, but it cannot reflect the above-mentioned advantages of the reverse material process. When the two processes coexist, the total output of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16
Inventor 张宝祥
Owner TIANJIN BOHUA YONGLI CHEM IND
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