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Method and system for recovering ammonia from byproduct ammonium chloride of potassium nitrate technology

A technology of potassium nitrate and ammonium chloride, applied in the field of chemical technology, can solve the problems of large desiccant, high energy consumption, cumbersome process flow of ammonia gas recovery process, etc., and achieve the effects of reducing consumption, reducing consumption and simple process

Inactive Publication Date: 2019-06-25
CHINA TIANCHEN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ammonia gas recovery process is cumbersome and consumes a lot of energy. Drying with calcium oxide will consume a lot of desiccant

Method used

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  • Method and system for recovering ammonia from byproduct ammonium chloride of potassium nitrate technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The atmospheric pressure of the place where the implementation case is located is 73KPaA.

[0042] After dissolving the wet ammonium chloride produced in the potassium nitrate process, 80kg / h of ammonium chloride solution containing 15wt% ammonium chloride at 25°C (the net ammonia content is about 3.81kg / h) is sent into the heat exchange system and steamed with ammonia The ammonia-containing gas discharged from the top of the tower is exchanged for heat. After the heat exchange, the ammonium chloride solution is 73°C, and the ammonia-containing gas at the top of the tower is cooled from 78°C to 57.3°C. The ammonium chloride solution after heat exchange is sent to the top of the ammonia distillation tower, and at the same time, 29kg / h of milk of lime containing 200tt active CaO at 85°C is added to the pre-ash bucket, and 13kg of fresh saturated steam of 0.5MPaG is fed into the bottom of the ammonia distillation tower / h. Control the operating pressure at the top of the ...

Embodiment 2

[0053] The atmospheric pressure of the place where the implementation case is located is 73KPaA.

[0054] After dissolving the wet ammonium chloride produced in the potassium nitrate process, 50kg / h of ammonium chloride solution containing 17wt% ammonium chloride at 25°C (the net ammonia content is about 2.70kg / h) is sent into the heat exchange system to be steamed with ammonia The ammonia-containing gas discharged from the top of the tower is exchanged for heat. After the heat exchange, the ammonium chloride solution is 50°C, and the ammonia-containing gas at the top of the tower is cooled from 71.3°C to 62.3°C. The ammonium chloride solution after heat exchange is sent to the top of the ammonia distillation tower, and at the same time, 24.8kg / h of lime milk containing 160tt active CaO at 85°C is added to the pre-ash bucket, and fresh saturated steam of 0.2MPaG is fed into the bottom of the ammonia distillation tower 10kg / h. Control tower top operating pressure -0.01MPaG.

...

Embodiment 3

[0065] The atmospheric pressure of the place where the implementation case is located is 73KPaA.

[0066] After dissolving the wet ammonium chloride produced in the potassium nitrate process, 50kg / h of ammonium chloride solution containing 17wt% ammonium chloride at 25°C (the net ammonia content is about 2.70kg / h) is sent into the heat exchange system to be steamed with ammonia The ammonia-containing gas discharged from the top of the tower is exchanged for heat. After the heat exchange, the ammonium chloride solution is 70°C, and the ammonia-containing gas at the top of the tower is cooled from 80.6°C to 66.8°C. The ammonium chloride solution after heat exchange is sent to the top of the ammonia distillation tower, and at the same time, 28.4kg / h of milk of lime containing 140tt active CaO at 85°C is added to the pre-ash bucket, and 0.1MPaG fresh saturated steam is fed into the bottom of the ammonia distillation tower 11kg / h. Control the operating pressure at the top of the t...

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Abstract

The invention provides a method and a system for recovering ammonia from a potassium nitrate technology byproduct ammonium chloride, and especially relates to a method for recycling ammonia gas recovered from the byproduct ammonium chloride of a technology for preparing potassium nitrate through a double decomposition process of nitric acid, ammonia and potassium chloride. The method comprises thefollowing steps: wet ammonium chloride or an ammonium chloride solution generated after centrifuging in the technology for preparing potassium nitrate through the double decomposition process is pretreated to prepare an ammonium chloride solution with a certain concentration; (2) the pretreated ammonium chloride solution goes through a heat exchange system, then is sent into an ammonia distillingsystem, and reacts with lime milk and steam; (3) an ammonia-containing gas generated in the ammonia distilling system is cooed by the heat exchange system, is dehydrated, and then is sent into a compressor; and (4) compressed ammonia gas in the compressor is sent into an ammonium nitrate workshop section, and reacts with nitric acid to prepare ammonium nitrate, and the generated ammonium nitrateis used as a raw material in the technology for preparing potassium nitrate through the double decomposition process. The method and the system have the characteristics of continuousness and stabilityin running, simple flow, reduction of the byproduct ammonium chloride, and reduction of the consumption of ammonia.

Description

technical field [0001] The invention belongs to the field of chemical technology, and in particular relates to a recycling process for recovering ammonia from the by-product ammonium chloride product of the potassium nitrate process prepared by nitric acid, ammonia and potassium chloride double decomposition method, and simultaneously preparing high-purity calcium chloride solution. Background technique [0002] The production method of potassium nitrate mainly consists of sodium nitrate-potassium chloride conversion method, ammonium nitrate-potassium chloride double decomposition method, ammonium nitrate-potassium chloride ion exchange method, nitric acid-potassium chloride solvent extraction method, etc., wherein ammonium nitrate-potassium chloride Potassium chloride double decomposition method has the advantages of convenient source of raw materials, simple process equipment, low energy consumption, less types of by-products and no pollution, and has become the main proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/18C01C1/02C01F11/28C01D9/10
Inventor 李黎峰陈学峰张沫胡书亚李相福李林方华东胡斌冯青天
Owner CHINA TIANCHEN ENG
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