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Treatment method for sewage produced in caprolactam ammoximation process

A technology for caprolactam amidoxime and sewage production, which is applied in the directions of oxidized water/sewage treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of high equipment investment and complicated operation, and reduce investment and operating costs. , No secondary pollution, low consumption effect

Inactive Publication Date: 2015-04-29
CHINA TIANCHEN ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can improve the utilization efficiency of oxidants, save treatment costs and meet the discharge standards of treated wastewater, it needs to use a special enhanced mass transfer oxidation reactor and MBR biofilm reactor, and the oxidation reaction environment is limited to specific pH conditions Under the circumstances, the equipment investment is too high and the operation is complicated

Method used

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  • Treatment method for sewage produced in caprolactam ammoximation process
  • Treatment method for sewage produced in caprolactam ammoximation process
  • Treatment method for sewage produced in caprolactam ammoximation process

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Under alkaline reaction conditions, the main oxidant is the sewage produced in the anthraquinone hydrogen peroxide production process, and the auxiliary oxidant is H 2 o 2 , the catalyst is Fe 2+ .

[0023] The caprolactam ammoximation production process sewage of a chemical enterprise has a COD of 5500mg / L, a B / C of 0.010, and a pH of 10.3.

[0024] The caprolactam ammoximation production process sewage is processed according to the following steps,

[0025] 1) Introduce the sewage generated by the ammoximation in the caprolactam plant and the hydrogen peroxide production process into the regulating tank respectively. The residence time of sewage in the regulating tank is 10 hours to ensure the stability of water quality and water quantity;

[0026] 2) The sewage in the adjustment tank is pumped to the advanced oxidation reaction tank, the reaction environment is alkaline (pH=10.3), and a certain amount of FeSO is added at the same time 4 solution and H 2 o 2 , ...

Embodiment 2

[0029] Under alkaline reaction conditions, the main oxidant is the sewage produced in the anthraquinone hydrogen peroxide production process, and the catalyst is Fe 2+ , without the use of co-oxidants.

[0030] The water quality of the caprolactam ammoximation production process sewage is the same as that of Example 1, that is, its COD is 5500 mg / L, B / C is 0.010, and pH=10.3.

[0031] The caprolactam ammoximation production process sewage is processed according to the following steps,

[0032] 1) Introduce the sewage generated by the ammoximation in the caprolactam plant and the hydrogen peroxide production process into the regulating tank respectively. The residence time of sewage in the regulating tank is 10 hours to ensure the stability of water quality and water quantity;

[0033] 2) The sewage in the adjustment tank is pumped to the advanced oxidation reaction tank, the reaction environment is alkaline (pH=10.3), and a certain amount of FeSO is added at the same time 4...

Embodiment 3

[0036] Under acidic reaction conditions, the main oxidant is the sewage produced in the anthraquinone hydrogen peroxide production process, and the auxiliary oxidant is H 2 o 2 , the catalyst is Fe 2+ .

[0037]The water quality of caprolactam ammoximation production process wastewater is the same as that of Example 1 except for pH, that is, its COD is 5500 mg / L, B / C is 0.010, and pH=4.6.

[0038] The caprolactam ammoximation production process sewage is processed according to the following steps,

[0039] 1) Introduce the sewage generated by the ammoximation in the caprolactam plant and the hydrogen peroxide production process into the regulating tank respectively. The residence time of sewage in the regulating tank is 10 hours to ensure the stability of water quality and water quantity;

[0040] 2) The sewage in the adjustment tank is pumped to the advanced oxidation reaction tank, the reaction environment is acidic (pH=4.6), and a certain amount of FeSO is added at the ...

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Abstract

The invention provides a treatment method for sewage produced in a caprolactam ammoximation process. The treatment method is characterized in that sewage produced by a hydrogen peroxide production process is utilized as a main oxidizing agent, under the combined action of a small quantity of other auxiliary oxidizing agents and a catalyst, or only the action of the main oxidizing agent, organic pollutants capable of causing biochemical system impact in sewage can be oxidized and degraded through an advanced oxidation reaction. According to the treatment method provided by the invention, the sewage produced in the hydrogen peroxide process in a caprolactam device is effectively and comprehensively utilized to realize the treatment of wastes with the wastes and the consumption of the oxidizing agents and the catalysts required by the advanced oxidation pretreatment of the sewage produced in the ammoximation process is greatly reduced; meanwhile, the method does not comprise the step of adjusting pH repeatedly, so that the running cost is greatly reduced, the environmental pollution is reduced, the operation is simple and easy to realize, and good economic and environmental benefits are realized.

Description

technical field [0001] The invention relates to the technical field of production wastewater treatment methods, in particular to a treatment method for production wastewater in a caprolactam ammoximation process. Background technique [0002] Caprolactam (CPL) is an important monomer for the production of nylon-6 fibers (nylon) and nylon-6 engineering plastics, and is widely used in the fields of nylon fibers, engineering plastics, and plastic films. Caprolactam production sewage is one of the most difficult production sewage in the petrochemical industry. Its main pollutants are cyclohexanone, cyclohexane, cyclohexanol, benzene, cyclohexanone oxime, organic acids, caprolactam, ammonia nitrogen, etc. In particular, the process sewage of the ammoximation unit has problems such as large water volume, high COD, low B / C ratio, complex composition, and difficult biochemical treatment, which is the most difficult problem in the treatment of caprolactam sewage. [0003] At present...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F9/14
CPCC02F1/722C02F1/52C02F1/725C02F9/00C02F2103/36
Inventor 吕威鹏赵斌李树华赵敏伟梁军湘谢蕊闫哲李荣杨克俭张媛王绍伟孙承宇陈凯华李明赵嫱
Owner CHINA TIANCHEN ENG
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