Treatment method for nitric-acid-containing wastewater in adipic acid production technology

A production process and treatment method technology, applied in the field of adipic acid production process wastewater treatment, can solve the problems of secondary pollution, high cost of nitric acid sludge, unsuitable for industrial wastewater treatment, etc.

Active Publication Date: 2015-06-24
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process uses coagulants and coagulants in pretreatment to coagulate and precipitate large-particle pollutants in wastewater, and then carry out biological treatment, which only completes the transfer or concentration of pollutants, causing secondary pollution. Treatment of high-concentration nitric acid sludge also requires high costs, and is not suitable for the treatment of large amounts of industrial wastewater

Method used

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  • Treatment method for nitric-acid-containing wastewater in adipic acid production technology

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Effect test

Embodiment 1

[0023] First, pre-treat the iron filings: soak them in methanol for 10 minutes, and then soak them in 0.05mol / L sulfuric acid solution for 10 minutes for subsequent use.

[0024] Put 1L of adipic acid production wastewater with an initial nitrate concentration of 3365mg / L into the reaction vessel, add 16.825g of pretreated iron filings and 6.73g of urea, and soak for 4 hours at 50°C. After the reaction, the nitrate concentration is 92mg / L, the selectivity of nitrogen is 94.1%.

Embodiment 2

[0026] First, pre-treat the iron shavings: soak them in ethanol for 10 minutes, and then soak them in 0.5mol / L hydrochloric acid solution for 30 minutes for subsequent use.

[0027] Put 1L of adipic acid production wastewater with an initial nitrate concentration of 3365mg / L into the reaction vessel, add 16.825g of pretreated iron shavings and 6.73g of urea, and soak for 6 hours at 20°C. After the reaction, the nitrate concentration is 109mg / L, the selectivity of nitrogen is 93.8%.

Embodiment 3

[0029] First, pre-treat the copper shavings: soak them in methanol for 10 minutes, and then soak them in 0.05mol / L hydrochloric acid solution for 15 minutes for subsequent use.

[0030] Put 1L of adipic acid production wastewater with an initial nitrate concentration of 3365mg / L into the reaction vessel, add 100.95g of pretreated copper filings and 33.65g of urea, and soak for 10 hours at 30°C. After the reaction, the nitrate concentration is 86mg / L, the selectivity of nitrogen is 92.6%.

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Abstract

The invention provides a treatment method for nitric-acid-containing wastewater in an adipic acid production technology. The treatment method comprises the following steps: (1) pretreatment: directly executing the next step according to a condition of active metal waste materials, or executing the next step after oil dirt is removed through immersion by organic low-carbon alcohol, or executing the next step after oxides are removed through inorganic acid leaching, or executing the next step after the oil dirt is removed through immersion by the organic low-carbon alcohol and then the oxides are removed through inorganic acid leaching; (2) treatment for nitric acid: adding the pretreated active metal waste materials into a container filled with the nitric-acid-containing wastewater, adding an additive into the container, generating reaction under an environment with the temperature of 20-50 DEG C for 4-10 hours. The nitric acid in the wastewater is reduced into nitrogen which is harmless to the environment under the joint action of the active metal waste materials and the additive and then is emitted; therefore, the limitation, which is caused by overhigh concentration of the nitric acid, to the subsequent treatment is fundamentally solved, and a requirement on biochemical treatment is met.

Description

technical field [0001] The present invention relates to a treatment method for adipic acid production process wastewater, specifically a waste material that utilizes the principle of chemical denitrification to utilize active metals from nitrate and nitrite in adipic acid industrial production wastewater Reduction with additives, finally reducing the nitrogen of nitric acid to nitrogen gas. Background technique [0002] Adipic acid is an important organic dibasic acid, mainly used to manufacture nylon 66 fiber and nylon 66 resin. In the organic synthesis industry, it is the basic raw material of adiponitrile and hexamethylenediamine, and can also be used to produce lubricants , It can also be used in medicine and other aspects, and has a wide range of uses. Adipic acid mainly produces high-concentration nitric acid wastewater in the production process, and the nitrate concentration can reach 3365mg / L. Through the analysis of its water quality, it can be seen that the bioch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F101/16C02F103/36
Inventor 王元平王绍伟孙承宇刘文王志文张媛袁海朋宋辉
Owner CHINA TIANCHEN ENG
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