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A kind of caprolactam industrial wastewater treatment method

A technology for industrial wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of high energy consumption, increased cost, and unsatisfactory caprolactam industrial wastewater treatment effect. and other problems to achieve the effect of reducing consumption, low cost and good treatment effect

Active Publication Date: 2015-10-28
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain by-products with higher added value from wastewater, but in the process of evaporation purification and concentration, vacuum distillation is required, and caprolactam wastewater contains a wide variety of organic matter, and the COD value is between 100-300g / L. Evaporating and concentrating to flammable requires high energy consumption, which virtually increases the cost
[0006] In summary, the prior art is not ideal for the treatment of caprolactam industrial wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 800ml of caprolactam wastewater with an initial COD value of 11000mg / L, adjust the pH value to 2 with concentrated sulfuric acid, and precipitate during the process, remove the precipitate by filtration, and put it into a Hastelloy reactor, and add 10g to the system with a concentration of 30%. (w / w)H 2 O 2 Aqueous solution, add 0.67g FeSO 4 As a catalyst, fill with pure oxygen until the pressure in the reactor reaches 1MPa, heat up to 70°C, and react for 30min at a speed of 800r / min; then heat up to 170°C and react for 2h.

[0017] After the reaction, the COD value in the wastewater was 899 mg / L, and the removal rate was 91.8%.

Embodiment 2

[0019] Get 800ml of caprolactam waste water with initial COD value of 9900mg / L, adjust the pH value to 4 with concentrated sulfuric acid, produce precipitation in the process, load in batch reactor type reactor after filtration, add 15g concentration in the system to be 40% (w / w)H 2 O 2 , 1.22gFe 2 (SO 4 ) 3 As a catalyst, fill with pure oxygen until the pressure in the reactor reaches 1.1MPa, heat up to 80°C, and react for 40min under the condition of rotating speed 1000r / min; then heat up to 180°C and react for 3h.

[0020] After the reaction, the COD value in the wastewater was 473 mg / L, and the removal rate was 95.3%.

Embodiment 3

[0022] Get 800ml of caprolactam waste water with initial COD value of 6600mg / L, adjust the pH value to 5 with concentrated sulfuric acid, produce precipitation in the process, load in batch tank reactor after filtration, add 15g concentration in the system to be 30% (w / w)H 2 O 2 , 1.37gMnCl 2 As a catalyst, filled with ultrapure oxygen at 1.2 MPa, heated to 40 °C, reacted for 10 min at a speed of 1500 r / min, and then heated to 150 °C and reacted for 4 h.

[0023] After the reaction, the COD value in the wastewater was 463 mg / L, and the removal rate was as high as 95.3%.

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PUM

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Abstract

The invention provides a caprolactam industrial waste water treatment method. The method has the characteristics that H2O2 is used as an oxidant on the basis of the traditional wet-type oxidation method, a high-efficient catalyst and appropriate reaction conditions are optimized, a better treatment effect can be achieved compared with the traditional wet-type oxidation method, the COD (chemical oxygen demand) removal rate can reach up to 70 to 90 percent through the two-step reaction, the biodegradability BOD (biological oxygen demand) / COD ratio is improved from 0.1 before the treatment to abount 0.5. In addition, by adopting the technical scheme, compared with the traditional fenton reagent method, the consumption of the H2O2 is remarkably reduced, and the cost is lower.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for treating caprolactam industrial wastewater. Background technique [0002] Caprolactam is an important chemical material whose main purpose is to generate polyurethane through polymerization, which can be further processed into fibers, plastics, films, etc. The main domestic production methods of caprolactam are the toluene method and the benzene method, but in the end, caprolactam is obtained through the liquid-phase Beckmann rearrangement reaction of cyclohexanone oxime. This process has a fast reaction speed and a high conversion rate, but the wastewater produced by it is difficult to treat. larger. The wastewater mainly contains caprolactam, ammonium sulfate, acetic acid, toluene, benzoic acid, cyclohexane carboxylic acid, cyclohexane carboxylic acid sulfonic acid, hexahydrobenzoic acid, cyclohexane and other components. High content, poor biodegradabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 王绍伟刘文孙承宇王元平袁海朋吕威鹏赵斌李树华
Owner CHINA TIANCHEN ENG
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