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Method and system for recovering ammonia from nitrile-containing organic wastewater

A technology for recovering ammonia from organic wastewater, applied in ammonia preparation/separation, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as pipelines affecting the stable operation of devices, and achieve the effect of improving the effect

Pending Publication Date: 2022-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem in the prior art that the blockage of the pipeline by the polymer in the absorption liquid affects the stable operation of the device, and provides a high-ammonia product gas stream from a nitrile (such as propionitrile) compound production device (such as an ammoxidation reactor) Method for recovering tail ammonia in

Method used

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  • Method and system for recovering ammonia from nitrile-containing organic wastewater
  • Method and system for recovering ammonia from nitrile-containing organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1. Preparation of wet oxidation catalyst

[0063] 1.1 Preparation method of catalyst carrier:

[0064] 20g Ba(NO 3 ) 2 Dissolved in 200mL water to prepare solution A, 160g of TiOSO 4 Dissolve in 2L of water to form solution B. At room temperature and at a stirring speed of 300 rpm, slowly add solution A and ammonia water (ammonia concentration 25-28wt%) into solution B slowly, control the final pH of the solution to 7.0, and continue stirring 2h. After the precipitate was filtered, it was washed three times with 500 mL of deionized water, and then dried at 80° C. for 24 h to obtain the precursor of the catalyst carrier. After mixing 100g of the powdered precursor with 5g of CMC, 10g of nitric acid, and 30g of water evenly, extrude into a strip, dry at room temperature for 48h, and roast at 500°C for 4h to obtain the catalyst carrier.

[0065] 1.2 Preparation method of catalyst

[0066] 0.5g H 2 PtCI 6 It was dissolved in 30 g of water, and 100 g of the catalyst ...

Embodiment 2

[0070] 1. Catalytic wet oxidation catalyst preparation

[0071] 1.1 Preparation method of catalyst carrier:

[0072] 30g Ba(NO 3 ) 2 Dissolved in 200mL water to prepare solution A, 160g of TiOSO 4 Dissolve in 2L of water to form solution B. At room temperature and at a stirring speed of 300 rpm, slowly add solution A and ammonia water (ammonia concentration 25-28wt%) into solution B slowly, control the final pH of the solution to 9.0, and continue stirring 2h, a precipitate formed. After the precipitate was filtered, it was washed three times with 500 mL of deionized water, and then dried at 80° C. for 24 h to obtain the precursor of the catalyst carrier. 100g of the powdered catalyst carrier precursor was uniformly mixed with 5g of CMC, 10g of sulfuric acid, and 30g of water, extruded, dried at room temperature for 48 hours, and calcined at 500°C for 4 hours to obtain the catalyst carrier.

[0073] 1.2 Preparation method of catalyst

[0074] 0.5gH 2 PtCl 6 It was diss...

Embodiment 3

[0078] 1. Catalytic wet oxidation catalyst preparation

[0079] 1.1 Preparation method of catalyst carrier:

[0080] 30g Ba(NO 3 ) 2 Dissolved in 200mL water to prepare solution A, 160g of TiOSO 4 Dissolve in 2L of water to form solution B. At room temperature and at a stirring speed of 300 rpm, slowly add solution A and 1M sodium carbonate solution dropwise to solution B respectively, control the final pH of the solution to 9.0, and continue stirring for 2 hours to form a precipitate thing. After the precipitate was filtered, it was washed three times with 500 mL of deionized water, and then dried at 80° C. for 24 h to obtain the precursor of the catalyst carrier. 100g of the powdered catalyst carrier precursor was uniformly mixed with 5g of CMC, 10g of sulfuric acid, and 30g of water, extruded, dried at room temperature for 48 hours, and calcined at 550°C for 4 hours to obtain the catalyst carrier.

[0081] 1.2 Preparation method of catalyst

[0082] 0.5gH 2 PtCl 6 I...

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Abstract

The invention relates to a method and a system for recovering ammonia from nitrile-containing organic wastewater. The method comprises the following steps: S1, allowing high-ammonia product gas flow from an ammoxidation reactor to contact with low-COD ammonium-poor absorption liquid in a quench tower, and absorbing unreacted ammonia in the high-ammonia product gas flow to obtain nitrile-containing organic wastewater and low-ammonia product gas flow; S2, removing heavy components from the nitrile-containing organic wastewater in a filtering and separating system, removing oil and enriching light components in an air floatation system by virtue of air floatation gas, conducting heating in a desorption column and carrying out stripping by stripping gas in the desorption column so as to obtain crude ammonia gas flow and high-COD ammonium-poor absorption liquid; and S3, reacting the high-COD ammonium-poor absorption liquid with an oxidant in a wet oxidation reactor with a wet oxidation catalyst bed to obtain a low-COD ammonium-poor absorption liquid, and returning the low-COD ammonium-poor absorption liquid to a quench tower for absorption of unreacted ammonia. According to the method, polymers, especially suspended solids, in the absorption liquid are effectively separated, and the effect of reducing COD in the absorption liquid through subsequent wet oxidation is enhanced.

Description

technical field [0001] The invention belongs to the technical field of ammonia recovery from nitrile-containing organic wastewater, in particular to a method and system for recovering ammonia from nitrile-containing organic wastewater. Background technique [0002] During the production of nitriles, large amounts of unreacted ammonia need to be absorbed and separated from the reactant stream. Although the prior art can reduce the ammonia content at the outlet of the reactor, 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 into sulfuric acid and returned to the system for recycling. There are also some patents that...

Claims

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Application Information

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IPC IPC(8): C01C1/12C01C1/02C02F9/10B01J27/053C02F101/38
CPCC01C1/12C01C1/024C02F9/00B01J27/053C02F1/001C02F1/24C02F1/02C02F2101/38Y02P20/52
Inventor 郭宗英陈航宁吴粮华郑育元许丹丹
Owner CHINA PETROLEUM & CHEM CORP
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