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Method for treating caprolactam oximation wastewater

A caprolactam oxime and biochemical treatment technology, which is applied in the directions of oxidized water/sewage treatment, water/sewage treatment, anaerobic digestion treatment, etc. The effect of low cost and reduced processing burden

Pending Publication Date: 2018-07-13
LIAOCHENG MEISI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, advanced oxidation uses hydrogen peroxide as the oxidant, ferrous sulfate and ferric sulfate catalyzed Fenton treatment process. This kind of method faces problems in practical application. On the other hand, the treatment effect on organic matter such as cyclohexylamine peroxide, cyclohexixazo, and N-nitrosoamines that develop color in oximation wastewater is poor.

Method used

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  • Method for treating caprolactam oximation wastewater

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Effect test

Embodiment 1

[0022] (1) Caprolactam oximation wastewater 1000L, water inlet conditions: pH 9-14, temperature 30-60°C, add sulfuric acid and stir or blow evenly to adjust the pH of the wastewater to 4.5.

[0023] (2) Add a strong oxidizing agent to the wastewater after pH adjustment, the dosage of perchloric acid is 0.05%, and the dosage of 30% hydrogen peroxide is 50ppm, and it is fully stirred or aerated until uniform.

[0024] (3) at 5m 3 h -1 The volume flow rate enters the fixed-bed reactor, and the catalytic oxidation treatment is carried out through the prepared Fe / activated carbon catalyst with a loading capacity of 5%, and the treated wastewater enters the biochemical treatment system.

[0025] (4) The primary aerobic treatment pool controls the temperature at 20-40°C, pH at 7.2, dissolved oxygen concentration at 3.6 mg / L, and aeration time of 20 hours to further oxidize residual organic matter and decompose organic nitrogen into ammoniacal nitrogen and Nitrate nitrogen.

[0026...

Embodiment 2

[0028] (1) Caprolactam oximation wastewater 1000L, water inlet conditions: pH 9-14, temperature 30-60°C, add sulfuric acid and stir or blow evenly to adjust the pH of the wastewater to 5.2.

[0029] (2) Add a strong oxidizing agent to the wastewater after pH adjustment, the dosage of sodium chlorate is 0.1%, the dosage of 30% hydrogen peroxide is 75ppm, fully stir or aerate until uniform.

[0030] (3) at 5m 3 h -1 The volume flow rate enters the fixed-bed reactor, and the prepared manganese / alumina catalyst with a loading capacity of 3% is used for catalytic oxidation treatment, and the treated wastewater enters the biochemical treatment system.

[0031] (4) In the aerobic aeration stage, the temperature of the SBR tank is controlled at 20-40°C, the pH is 7.6, the dissolved oxygen concentration is 3.3 mg / L, and the aeration time is 25 hours, so as to further oxidize the residual organic matter and decompose the organic nitrogen into ammoniacal nitrogen and nitrate nitrogen. ...

Embodiment 3

[0034] (1) Caprolactam oximation wastewater 1000L, water inlet conditions: pH 9-14, temperature 30-60°C, add sulfuric acid and stir or blow evenly to adjust the pH of the wastewater to 5.0.

[0035] (2) Add a strong oxidant after adjusting the pH of the wastewater, the dosage of ammonium persulfate is 0.15%, the dosage of 30% hydrogen peroxide is 100ppm, fully stir or aerate until uniform.

[0036] (3) at 5m 3 h -1 The volume flow rate enters the fixed-bed reactor, and the catalytic oxidation treatment is carried out through the prepared Fe / ZSM-5 catalyst with a loading capacity of 2%, and the treated wastewater enters the biochemical treatment system.

[0037] (4) The primary oxidation ditch controls the temperature at 20-40°C, pH at 8.0, dissolved oxygen concentration at 3.3 mg / L, and aeration time of 25 hours to further oxidize residual organic matter and decompose organic nitrogen into ammoniacal nitrogen and nitrate nitrogen .

[0038] (5) The concentration of microorgan...

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Abstract

A purpose of the present invention is to provide a method for treating caprolactam oximation wastewater, wherein the used equipment comprises an adjustment pool, a strong oxidation pool, a fixed bed reactor and a biochemical treatment system. According to the method, caprolactam oximation wastewater enters the pH value adjustment tank and is subjected to pH value adjustment, the adjusted wastewater enters the strong oxidation pool and is subjected to oxidation treatment, the treated wastewater is introduced into the fixed bed reactor and is subjected to further catalytic degradation, and finally the degraded wastewater is treated by the biochemical treatment system so as to achieve standard discharge. According to the present invention, the method is only used for the treatment of caprolactam device oximation process wastewater, the key is the selection of the strong oxidant and the fixed bed catalysis, the coloring organic matter in the oximation wastewater is subjected to targeted catalytic degradation, the COD and and the chrominance in the oximation wastewater are reduced, and the treatment burden of the biochemical system is reduced.

Description

technical field [0001] The patent of the present invention relates to waste water treatment, in particular to a method for treating caprolactam oximation waste water. Background technique [0002] Caprolactam (CPL) is an important chemical raw material, mainly used in the production of nylon six fibers and nylon six engineering plastics. In order to improve the defects of long traditional production process of caprolactam, serious equipment corrosion and large pollutant discharge, and realize the atomic economic reaction of industrial production, the new caprolactam production process uses titanium silicon molecular sieve as the catalyst, and cyclohexanone, liquid ammonia and hydrogen peroxide react under the action of the catalyst. High conversion rate (conversion rate of cyclohexanone > 99%), high selectivity (selectivity of cyclohexanone oxime > 99%) to prepare cyclohexanone oxime in one step, and cyclohexanone oxime to prepare caprolactam through Beckmann rearrange...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/10C02F101/16C02F101/30C02F101/34C02F101/38
CPCC02F1/66C02F1/72C02F1/722C02F1/725C02F3/02C02F3/28C02F9/00C02F2101/10C02F2101/16C02F2101/30C02F2101/34C02F2101/38
Inventor 胡大春张照飞赵桂平曹全福
Owner LIAOCHENG MEISI NEW MATERIAL TECH CO LTD
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