Method for processing wastewater from nitrochlorobenzene production

A technology for the production of waste water and nitrochlorobenzene, applied in chemical instruments and methods, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem that nitrochlorobenzene is difficult to meet the discharge standards and lacks complete and effective methods, carbon tetrachloride problems and other problems, to achieve stable and reliable treatment effect, easy industrial scale-up, and improve the recovery rate

Active Publication Date: 2012-04-18
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method proposed in this patent does have obvious effects on the separation of nitrochlorobenzene in wastewater, there are still some problems in this method: first, after the extraction operation, the content of nitrochlorobenzene in wastewater is difficult to reach the discharge standards; secondly, the patent only focused on changes in the content of nitrochlorobenzene in wastewater, and did not consider other indicators (such as chromatici

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for processing wastewater from nitrochlorobenzene production
  • Method for processing wastewater from nitrochlorobenzene production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The pH value of nitrochlorobenzene production wastewater in a company is 12.0, the salt content is 2.7%, the content of nitrochlorobenzene is 1180mg / L, and the chroma is 5000 times.

[0029]The temperature in the bottom of the stripper is controlled at 120°C, the pressure (gauge pressure) at the top of the stripper is controlled at 0.08MPa, the theoretical plate number of the stripper is 25, and the outflow of the top of the stripper is 20% of the water entering the tower Under certain conditions, the content of nitrochlorobenzene in the effluent of the stripping tower can be reduced to within 30 mg / L.

[0030] Next, when the temperature of the waste water is 90° C., the pH of the effluent of the stripping tower is adjusted to 2.0 with 5% sulfuric acid.

[0031] Next, the wastewater is subjected to catalytic oxidation treatment, the temperature of the catalytic oxidation reaction system is controlled at 90°C, the pressure is normal pressure, and the amount of 27.5% hydr...

Embodiment 2

[0036] The pH value of nitrochlorobenzene production wastewater from a company is 13.0, the salt content is 2.3%, the content of nitrochlorobenzene is 780mg / L, and the chroma is 4200 times.

[0037] Under the conditions that the temperature of the stripper tower kettle is controlled at 105°C, the pressure at the top of the stripper tower is controlled at normal pressure, the theoretical plate number of the stripper tower is 15, and the outflow of the tower top of the stripper tower is 8% of the water entering the tower, The content of nitrochlorobenzene in the effluent of the stripping tower can be reduced to less than 100 mg / L.

[0038] Next, when the temperature of the waste water is 85° C., the pH of the effluent of the stripping tower is adjusted to 2.5 with 5% sulfuric acid.

[0039] Next, carry out catalytic oxidation treatment to waste water, the temperature control of catalytic oxidation reaction system is 85 ℃, the pressure is normal pressure, the dosage of 27.5% hydr...

Embodiment 3

[0044] The pH value of nitrochlorobenzene production wastewater from a company is 13.0, the salt content is 2.3%, the content of nitrochlorobenzene is 780mg / L, and the chroma is 4200 times.

[0045] Under the conditions that the temperature of the stripper tower kettle is controlled at 105°C, the pressure at the top of the stripper tower is controlled at normal pressure, the theoretical plate number of the stripper tower is 15, and the outflow of the tower top of the stripper tower is 8% of the water entering the tower, The content of nitrochlorobenzene in the effluent of the stripping tower can be reduced to less than 100 mg / L.

[0046] Next, when the temperature of the waste water is 85° C., the pH of the effluent of the stripping tower is adjusted to 4.0 with 5% sulfuric acid.

[0047] Next, carry out catalytic oxidation treatment to waste water, the temperature control of catalytic oxidation reaction system is 85 ℃, the pressure is normal pressure, the dosage of 27.5% hydr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for processing wastewater from nitrochlorobenzene production, comprising the following steps that: 1, wastewater is successively subject to treatment through a slag-water separator and a stripping tower and is discharged from the tower bottom of the stripping tower, then the discharged water is subject to indirect heat exchange and heating through the steam of thetower top of stripping tower, and then the heated product enters into the stripping tower for stripping; 2, the pH value of the output water from the stripping tower bottom, which is subject to indirect heat exchange and cooling through the wastewater from nitrochlorobenzene production, is regulated to acidity; 3, the acid wastewater is subject to catalytic oxidation, wherein, the oxidizing agentis hydrogen peroxide, and the catalyst is a composition of ferric salt and copper salt; 4, the pH value of the output water processed by catalytic oxidation is regulated to neutral or alkalescence to carry out precipitation reaction of dissolved copper and iron and decomposition reaction of residual H2O2 in the water; and 5, slag-water separation is carried out on the reaction effluent, the separated slag is subject to further disposal or comprehensive utilization, and the water reaches the standards of discharge after carrying out indirect heat exchange with the wastewater from nitrochlorobenzene production. The method disclosed herein can effectively reduce the chromaticity, COD and nitrochlorobenzene content of the wastewater, and realize the standard discharge of the wastewater.

Description

technical field [0001] The invention relates to a treatment method of organic chemical wastewater, in particular to a treatment method of refractory organic chemical wastewater, specifically a method for treatment of nitrochlorobenzene production wastewater. Background technique [0002] Nitrochlorobenzene is an intermediate of many fine chemical products such as medicine, pesticide and dye. The production of nitrochlorobenzene is based on chlorobenzene, and the mixed acid of nitric acid and sulfuric acid is used as the nitrating agent for nitration. The crude product obtained by nitration needs to be washed with alkali and water, and then separated and purified by a rectification tower to obtain p-nitrochlorobenzene. Chlorobenzene and o-nitrochlorobenzene. Using the above production process, the production of each ton of nitrochlorobenzene products will produce 1.2 to 1.8 tons of waste water, which mainly contains nitrochlorobenzene, nitrochlorophenol and other pollutants,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/10C02F1/72
Inventor 李正琪莫馗程学文万国晖纪然高凤霞张宾
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap