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Method and system for removing HCN (hydrogen cyanide) in ammonium sulfate

A technology for removing ammonium sulfate, applied in a method and system field of HCN, can solve problems such as environmental pollution, environmental secondary pollution, and low cyanide content, and achieve the goals of reducing production costs, improving product quality, and reducing pollution Effect

Active Publication Date: 2014-01-08
CHONGQING UNISPLENDOUR INT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because during the evaporation process of the ammonium sulfate solution, part of the HCN escapes with the secondary steam to cause environmental pollution, and a part will remain in the ammonium sulfate product and affect the product quality.
Therefore, the conventional method will not only cause the waste of HCN, but also cause secondary pollution to the environment, so it is necessary to carry out decyanation treatment to the ammonium sulfate solution in order to improve product quality and avoid environmental pollution
[0004] At present, there are few relevant reports on ammonium sulfate decyanation. The common method is to strip HCN in the ammonium sulfate solution after preheating the air, and then use sodium hydroxide or other substances that react easily with HCN to absorb the gas.
The disadvantage of this method is that the ammonia removal rate is low, the investment is large, and a special HCN gas absorption device needs to be built, and the cyanide content in the recovered liquid obtained by absorption is low, which affects its subsequent use.

Method used

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  • Method and system for removing HCN (hydrogen cyanide) in ammonium sulfate

Examples

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Effect test

Embodiment 1

[0047]Angle's method is proposed by German I.G company Androsov (L.Andrussow), and realizes a kind of method of industrialized production of hydrocyanic acid first in Germany. The method uses methane, ammonia and air as raw materials and platinum as a catalyst to produce hydrocyanic acid. At present, the Angle method is one of the main methods for the industrial production of hydrocyanic acid in foreign countries. The Angle method is mature in technology, economical and reasonable, and uses natural gas (methane) as raw material, which is rich in resources.

[0048] In this example, the 1m 3 By-product ammonium sulfate solution, the mass fraction of ammonium sulfate detected by analysis is 31%, and the CN- content is 3g / L.

[0049] Above-mentioned solution is used the method for removing the HCN in the ammonium sulfate of the present invention, comprises the steps:

[0050] S 1 : the ammonium sulfate solution is transported to the heat exchanger with a production pump,

[0...

Embodiment 2

[0061] Angle's method is proposed by German I.G company Androsov (L.Andrussow), and realizes a kind of method of industrialized production of hydrocyanic acid first in Germany. The method uses methane, ammonia and air as raw materials and platinum as a catalyst to produce hydrocyanic acid. At present, the Angle method is one of the main methods for the industrial production of hydrocyanic acid in foreign countries. The Angle method is mature in technology, economical and reasonable, and uses natural gas (methane) as raw material, which is rich in resources.

[0062] In this example, the 1m 3 By-product ammonium sulfate solution, the mass fraction of ammonium sulfate detected by analysis is 30%, and the CN- content is 6g / L.

[0063] Above-mentioned solution is used the method for removing the HCN in the ammonium sulfate of the present invention, comprises the steps:

[0064] S 1 : the ammonium sulfate solution is transported to the heat exchanger with a production pump,

[...

Embodiment 3

[0075] The light oil cracking method uses light oil (or gasoline), liquid ammonia and caustic soda as the main raw materials, and petroleum coke particles and nitrogen as auxiliary raw materials. Firstly, light oil and liquid ammonia are gasified, mixed and preheated in the atomizer according to the proportion, and the three-phase electrode is immersed in the boiling reaction furnace where the petroleum coke particle layer is conductive and heated, and it can be cracked into hydrogen at normal pressure and high temperature. The cracking gas of cyanic acid.

[0076] In this example, the 1m obtained by using the light oil cracking method 3 By-product ammonium sulfate solution, the mass fraction of ammonium sulfate detected by analysis is 30%, and the CN- content is 6g / L.

[0077] Above-mentioned solution is used the method for removing the HCN in the ammonium sulfate of the present invention, comprises the steps:

[0078] S 1 : the ammonium sulfate solution is transported to ...

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Abstract

The invention provides a method and a system for removing HCN (hydrogen cyanide) in ammonium sulfate. The method includes the steps: delivering a produced ammonium sulfate solution to a heat exchanger; heating the ammonium sulfate solution with steam, and then feeding the heated ammonium sulfate solution into a decyanation kettle for flash evaporation; feeding the steam and HCN after flash evaporation into an HCN recycling pipeline, and recycling the HCN. The system comprises an ammonium sulfate circulation tank, an ammonium sulfate heater, the decyanation kettle and a cyclone separator. According to the characteristic that the HCN is low in boiling point and easy to escape from the solution under the condition of high temperature, the ammonium sulfate is subjected to evaporation decyanation through a flash evaporation mode, the removed HCN is recycled, an ammonium sulfate decyanation process and hydrocyanic acid synthesis process are integrated, the problem that HCN-containing gas after flash evaporation is not easy to treat under general conditions is solved, production cost of the HCN is lowered, pollution caused by HCN tail gas emitted by ammonium sulfate evaporation can be reduced, and the method and the system have great significance to waste resource utilization and environmental protection.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method and system for removing HCN in ammonium sulfate. Background technique [0002] Ammonium sulfate is an excellent nitrogen fertilizer, which is suitable for general soil and crops. It can make branches and leaves grow vigorously, improve fruit quality and yield, and enhance crop resistance to disasters. It can be used as base fertilizer, topdressing fertilizer and seed fertilizer. It can carry out metathesis reaction with table salt to produce ammonium chloride, produce refractory materials together with boric acid, etc., and can increase conductivity in heating electroplating solution. [0003] At present, industrial production mainly uses sulfuric acid or ammonia water to absorb by-products or exhaust gas to obtain ammonium sulfate. HCN by-product ammonium sulfate is to absorb NH in HCN synthesis gas with sulfuric acid. 3 be made of. Angle method, light oil cracking me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/24C01C3/02
Inventor 郑伯川徐代行柳亚玲刘丹范倩玉
Owner CHONGQING UNISPLENDOUR INT CHEM
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