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Method for improving biodegradability of waste water produced by caprolactam ammoximation

A technology for caprolactam amidoxime and waste water production, which is applied in chemical instruments and methods, water/sewage treatment, neutralized water/sewage treatment, etc. The effect of small size, simple processing method, and easy implementation

Active Publication Date: 2014-08-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN101618919 proposes a method for catalytic oxidation treatment of ammoximation wastewater, which can effectively improve the biodegradability of wastewater, but this method has the disadvantages of large dosage of chemicals and high treatment cost

Method used

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  • Method for improving biodegradability of waste water produced by caprolactam ammoximation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Treatment of caprolactam ammoximation wastewater. The operating conditions are determined as follows: the pH value of the influent water is 2.5, the temperature is 20°C, the dosage of ferrous sulfate is 120mg / L, and the residence time of the wastewater in the reactor is 100 minutes. The water quality indicators of the wastewater before and after treatment are shown in Table 1.

[0025] Table 1

[0026] water quality data

[0027] It can be seen from the data in Table 1 that after the wastewater is treated, the content of similar peroxides is greatly reduced, the biodegradability is greatly improved, and the wastewater meets the requirements of entering the biochemical system for treatment.

Embodiment 2

[0029] Treatment of caprolactam ammoximation wastewater. The operating conditions are determined as follows: the pH value of the influent water is 3, the temperature is 40°C, the dosage of ferric sulfate is 100 mg / L, and the residence time of the wastewater in the reactor is 90 minutes. The water quality indicators of the wastewater before and after treatment are shown in Table 2.

[0030] Table 2

[0031] water quality data

[0032] It can be seen from the data in Table 2 that after the wastewater is treated, the content of substances similar to peroxides is greatly reduced, the biodegradability is greatly improved, and the wastewater meets the requirements of entering the biochemical system for treatment.

Embodiment 3

[0034] Treatment of caprolactam ammoximation wastewater. The operating conditions are determined as follows: the pH value of the influent water is 4, the temperature is 80°C, the dosage of manganese oxide is 80 mg / L, and the residence time of the wastewater in the reactor is 40 minutes. The water quality indicators of the wastewater before and after treatment are shown in Table 3.

[0035] table 3

[0036] water quality data

[0037] raw water

[0038] It can be seen from the data in Table 3 that after the wastewater is treated, the content of substances similar to peroxides is greatly reduced, the biodegradability is greatly improved, and the wastewater meets the requirements of entering the biochemical system for treatment.

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Abstract

The invention relates to a method for improving biodegradability of waste water produced by caprolactam ammoximation. The method comprises that a pH value of waste water is adjusted to 0-7; one or more agents are added into the treated waste water, wherein the one or more agents are selected from ferrous salts, ferric salts, ferrous powder, manganese salts and manganese oxide and a use amount of the one or more agents in 1L of the waste water is in a range of 5 to 500mg; and the mixture undergoes a reaction at a temperature of 0-120 DEG C for 1-600min. The method has the advantages of simple processes, low treatment device investment, low treatment cost and no secondary pollution.

Description

technical field [0001] The invention relates to a method for improving the biodegradability of wastewater produced by caprolactam ammoximation process. Background technique [0002] Caprolactam is a monomer for synthesizing nylon-6 fibers and nylon-6 engineering plastics, and is widely used in the field of polymer materials. COD and BOD in wastewater produced by caprolactam process 5 , ammonia nitrogen and other high content, the main pollutants are cyclohexanone, cyclohexane, cyclohexanol, benzene, cyclohexanone oxime, organic acid, caprolactam, ammonia nitrogen and so on. At present, the treatment of caprolactam wastewater is mainly biochemical method. [0003] In recent years, the research on the production process of caprolactam has made remarkable progress. Many economical and environmentally friendly new processes have been developed and applied. While the application of new processes has brought economic benefits to enterprises, it has also changed the quality and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F1/66
Inventor 高峰张利强
Owner CHINA PETROLEUM & CHEM CORP