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A method for synergistic resource treatment of acrylonitrile-containing waste gas and waste high-ammonia nitrogen water

A treatment method, acrylonitrile technology, applied in degassed water/sewage treatment, neutralized water/sewage treatment, textile industry wastewater treatment, etc., can solve the problem of increasing operating costs and investment, affecting equipment service life, secondary pollution of nitrogen oxides and other problems, to achieve the effect of low cost, convenient operation and simple process

Active Publication Date: 2022-03-22
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above patent removes acrylonitrile and produces new pollution source ammonia and absorption liquid at the same time, and ammonia gas severely corrodes the incineration equipment, seriously affects the service life of the equipment, and produces secondary pollution nitrogen oxides, and the absorption liquid needs further treatment. Increased operating costs and investment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A company produces acrylonitrile waste gas in the production process of dye intermediates, with a gas volume of 500Nm 3 / h, acrylonitrile content 1650mg / m 3 , benzene concentration 0.1mg / m 3 , The high ammonia nitrogen wastewater produced by another dye workshop, the ammonia nitrogen is 2000mg / L, and the sodium chloride content is 10%.

[0032] (1) Alkali hydrolysis stripping: adjust the pH of the waste water to 10, raise the temperature of the waste water to 50°C, and feed acrylonitrile waste gas at a gas-liquid ratio of 100:1, the acrylonitrile content of the outlet gas is not detected, and the benzene is not detected. Ammonia nitrogen in wastewater is 300mg / L;

[0033] (2) polymerization evaporation: the above-mentioned waste water is added with hydrochloric acid to adjust pH to 5 and then add a certain amount of sodium persulfate, enter the evaporation system, the evaporation temperature is 85 ° C, the vacuum degree is 0.5 Mpa, and the sodium chloride salt and con...

Embodiment 2

[0036] A company produces acrylonitrile waste gas in the production process of dye intermediates, with a gas volume of 500Nm 3 / h, acrylonitrile content 1650mg / m 3 , benzene concentration 0.1mg / m 3 , The high ammonia nitrogen wastewater produced by another dye workshop, the ammonia nitrogen is 2000mg / L, and the sodium chloride content is 10%.

[0037] (1) Alkali hydrolysis stripping: adjust the pH of the waste water to 11, raise the temperature of the waste water to 60°C, and feed acrylonitrile waste gas at a gas-liquid ratio of 300:1, and the outlet gas acrylonitrile content is 0.2 mg / m 3 , benzene was not detected, and the ammonia nitrogen in the wastewater was 80 mg / L;

[0038] (2) polymerization evaporation: the above-mentioned waste water is added with hydrochloric acid to adjust pH to 5 and then add a certain amount of sodium persulfate, enter the evaporation system, the evaporation temperature is 85 ° C, the vacuum degree is 0.5 Mpa, and the sodium chloride salt and c...

Embodiment 3

[0041] A company produces acrylonitrile waste gas in the production process of dye intermediates, with a gas volume of 500Nm 3 / h, the content of acrylonitrile is 1650mg / m3, the concentration of benzene is 0.1mg / m3, and the high ammonia nitrogen wastewater produced by another dye workshop, the ammonia nitrogen is 2000mg / L, and the sodium chloride content is 10%.

[0042](1) Alkaline hydrolysis stripping: adjust the pH of the waste water to 11, raise the temperature of the waste water to 60°C, and feed acrylonitrile waste gas at a gas-liquid ratio of 300:1, the outlet gas acrylonitrile content is 0.2 mg / m3, and benzene is not detected , wastewater ammonia nitrogen is 80mg / L;

[0043] (2) polymerization evaporation: the above-mentioned waste water is added with hydrochloric acid to adjust pH to 5 and then add a certain amount of sodium persulfate, enter the evaporation system, the evaporation temperature is 85 ° C, the vacuum degree is 0.5 Mpa, and the sodium chloride salt and c...

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Abstract

The invention discloses a method for synergistic resource treatment of acrylonitrile-containing waste gas and high-ammonia nitrogen waste water. The method of the present invention is mainly aimed at acrylonitrile waste gas and waste water with high ammonia nitrogen, and adopts the method of combining alkaline solution blow-off, polymerization evaporation, nitrogen recovery and tail gas treatment, which can not only remove toxic and harmful substances such as acrylonitrile, but also realize the purification of waste water. governance, and at the same time recover the nitrogen source for agricultural and industrial production.

Description

technical field [0001] The invention belongs to the technical field of waste gas and waste water treatment, in particular to a method for synergistic resource treatment of acrylonitrile-containing waste gas and high ammonia nitrogen waste water. Background technique [0002] Acrylonitrile is an important chemical raw material for the production of three synthetic materials of fiber, rubber and plastic, and is widely used. However, due to the limitations of the current process conditions, the exhaust gas often contains a certain amount of acrylonitrile. If this waste gas is directly discharged into the atmosphere, it will inevitably cause serious pollution to the environment. The maximum allowable emission concentration of acrylonitrile gas in the Comprehensive Emission Standard of Air Pollutants is 22mg / m 3 , With the increasing problem of environmental pollution, this standard is bound to continue to increase, which puts forward higher requirements for the effective treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10B01D53/75B01D53/78B01D53/54B01D53/58C02F101/16C02F103/30
CPCC02F9/00B01D53/75B01D53/78B01D53/54B01D53/58C02F1/66C02F1/02C02F2103/30C02F1/20C02F1/048C02F2101/16C02F2303/22B01D2257/408
Inventor 李晓伟王安龙陈丽娜毛兵赵忠
Owner ZHEJIANG QICAI ECO TECH CO LTD