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Method for processing of unreacted ammonia in acrylonitrile reaction device

A technology of a reaction device and a treatment method, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of high energy consumption, incomplete absorption of unreacted ammonia, etc., and achieve the effect of reducing energy consumption

Active Publication Date: 2016-06-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of incomplete absorption of unreacted ammonia and high energy consumption in the prior art, and a new treatment method for unreacted ammonia in an acrylonitrile reaction device is provided

Method used

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  • Method for processing of unreacted ammonia in acrylonitrile reaction device
  • Method for processing of unreacted ammonia in acrylonitrile reaction device
  • Method for processing of unreacted ammonia in acrylonitrile reaction device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The high-ammonia product gas stream from the propylene ammoxidation reactor is contacted with the poor ammonium absorption liquid in the quench tower to absorb unreacted ammonia to obtain a low-ammonia product gas stream and a rich ammonium absorption liquid. The S / P molar ratio in the poor ammonium absorption liquid is 0.01, and the phosphorus The mass content of the element is 6.5%, the pH value of the absorption liquid is 2, the temperature of the ammonium-poor absorption liquid is 85° C., and the content of ammonia in the low-ammonia product gas stream obtained through absorption is detected to be 0. The ammonium-rich absorption liquid enters the separation device after being stripped by steam stripping gas in the stripping tower to remove light components and heavy components including catalysts and / or polymers, and then enters the desorption tower for analysis to obtain crude ammonia gas stream and ammonium-poor The absorption liquid, the operating temperature of t...

Embodiment 2

[0033] The high-ammonia product gas stream from the propylene ammoxidation reactor is contacted with the poor ammonium absorption liquid in the quench tower to absorb unreacted ammonia to obtain a low-ammonia product gas stream and a rich ammonium absorption liquid. The S / P molar ratio in the poor ammonium absorption liquid is 0.05, and the phosphorus The mass content of the element is 8.0%, the pH value of the absorption liquid is 3.5, the temperature of the ammonium-poor absorption liquid is 75° C., and the content of ammonia in the low-ammonia product gas stream obtained through absorption is detected to be 0. The ammonium-rich absorption liquid enters the separation device after being stripped by air in the stripping tower to remove light components and heavy components including catalysts and / or polymers, and then enters the desorption tower for analysis to obtain crude ammonia gas flow and ammonium-poor absorption liquid. The operating temperature of the tower is 250°C, a...

Embodiment 3

[0036] The high-ammonia product gas stream from the propylene ammoxidation reactor is contacted with the poor ammonium absorption liquid in the quench tower to absorb unreacted ammonia to obtain a low-ammonia product gas stream and a rich ammonium absorption liquid. The S / P molar ratio in the poor ammonium absorption liquid is 0.1, and the phosphorus The element mass content is 5.0%, the pH value of the absorption solution is 2.5, the temperature of the ammonium-poor absorption solution is 50° C., and the ammonia content in the low-ammonia product gas stream obtained through absorption is detected to be 0. The ammonium-rich absorption liquid enters the separation device after being stripped by nitrogen in the stripping tower to remove light components and heavy components including catalysts and / or polymers, and then enters the analysis tower for analysis to obtain crude ammonia gas flow and ammonium-poor absorption liquid. The operating temperature of the tower is 150°C, and t...

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Abstract

The present invention relates to a method for processing of unreacted ammonia in an acrylonitrile reaction device, and mainly solves the problem of incomplete absorption of the unreacted ammonia in the prior art. By use of the method, the problem can be well solved, and the method is as follows: the unreacted ammonia in a high ammonia product gas stream can be absorbed by contact of the high ammonia product gas stream and a lean ammonium absorbing liquid in a quench tower to obtain an ammonium-rich absorbing liquid and a low ammonia product gas stream; volatile organic components in the ammonium-rich absorbing liquid can be removed by stripping with a stripping tower stripping gas in a stripping tower, light components floating on the upper layer and heavy components sinking into the lower layer can be removed by separation in a separation device, a crude ammonia gas stream and a lean ammonium absorbing liquid can be obtained by heating and stripping with a deabsorption tower stripping gas in a deabsorption tower, and the lean ammonium absorbing liquid is returned to the quench tower to be used for absorption of the unreacted ammonia; by catalytic wet oxidation of the crude ammonia gas stream, an ammonia-free material stream is obtained and is used for device circulation water; and the lean ammonium absorbing liquid comprises at least one absorbent selected from phosphoric acid, ammonium dihydrogen phosphate or sulfuric acid. The method can be used in acrylonitrile production.

Description

technical field [0001] The invention relates to a treatment method for unreacted ammonia in an acrylonitrile reaction device. Background technique [0002] During the production of acrylonitrile, about 10% of unreacted ammonia needs to be absorbed and separated from the reactant stream. Although there are techniques to reduce the ammonia content at the reactor outlet, there is still a large amount of unreacted ammonia. The current production process is mainly to absorb unreacted ammonia through sulfuric acid washing, and the ammonium sulfate wastewater is directly injected into the deep well for treatment, or the crystalline ammonium sulfate is recovered through the ammonium sulfate recovery section, or the ammonium sulfate is incinerated to produce SO 3 , and then absorbed to make sulfuric acid back to the system for recycling. There are also some patents that recover unreacted ammonia through the neutralization of phosphoric acid, ammonium dihydrogen phosphate or a mixtu...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/58B01D53/75
CPCY02A50/20
Inventor 郭宗英陈航宁郑育元吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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