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Method for treating waste water from meta dinitro benzene production

A technology for the production of m-dinitrobenzene and waste water, which is applied in water/sewage treatment, adsorption water/sewage treatment, neutralized water/sewage treatment, etc. It can solve problems such as high salt content, human health impact, and high toxicity , to achieve good regeneration performance

Inactive Publication Date: 2006-06-07
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high salt content and high toxicity of this waste water, it is difficult to use conventional biochemical and chemical oxidation methods to work. At the same time, because the main component of waste water is nitro compounds, which are strong carcinogens, discharge into water bodies will cause serious damage to human health. Impact
At present, a large amount of m-dinitrobenzene wastewater has not been effectively treated, which is bound to seriously restrict the sustainable development of m-dinitrobenzene production enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Primary adsorption

[0023] 20 mL (about 14 grams) of macroporous complex adsorption resin NDA-1507 was loaded into a jacketed glass adsorption column (Φ12×160 mm). Wastewater COD Cr is 11000mg / L, add H 2 SO 4 After adjusting pH=1.5, let it stand for 24 hours, and after filtration, pass it through the resin bed at a flow rate of 20 mL / h at 15±5 °C, and the treatment capacity is 160 mL / batch. After adsorption by resin, the effluent COD Cr It is 2150mg / L.

[0024] When the adsorption reaches the first leakage point (when the adsorption effluent COD Cr When it reaches about 3000mg / L, it is the first leak point) to stop the adsorption, and 30mL of 6% sodium hydroxide aqueous solution is desorbed through the resin bed at a flow rate of 5mL / h at a temperature of 45±5℃. The desorbed high-concentration nitrobenzene sulfonic acid sodium salt solution can be sent to coal-water slurry or concentrated and sent to incineration. The low-concentration desorption solution is...

Embodiment 2

[0031] (1) Primary adsorption

[0032] 100 mL (about 700 g) of macroporous complex adsorption resin NDA-1507 was loaded into a jacketed glass adsorption column (Φ32×260 mm). Wastewater COD Cr is 15000mg / L, add H 2 SO 4 After adjusting pH=1, it was allowed to stand for 48 hours, and after filtration, it was passed through the resin bed at a flow rate of 120 mL / h at 15±5° C., and the treatment capacity was 700 mL / batch. After adsorption by resin, the effluent COD Cr It is 2560mg / L.

[0033] 100 mL of 10% aqueous sodium hydroxide solution was passed through the resin bed in co-current flow at a temperature of 35±5° C. at a flow rate of 50 mL / h for desorption. The desorbed high-concentration nitrobenzene sulfonic acid sodium salt solution can be sent to coal-water slurry or concentrated and sent to incineration. The low-concentration desorption solution is used to prepare the aqueous sodium hydroxide solution for the next batch of desorption.

[0034] (2) Secondary adsorpti...

Embodiment 3

[0040] (1) Primary adsorption

[0041] 1000 mL (about 7000 g) of macroporous complex adsorption resin NDA-1507 was loaded into a jacketed glass adsorption column (Φ70×500 mm). Wastewater COD Cr is 13000mg / L, add H 2 SO 4 After adjusting pH=4, it was left to stand for 36 hours, and after filtration, it was passed through the resin bed at a flow rate of 500mL / h at 15±5°C, and the treatment capacity was 6000mL / batch. After adsorption by resin, the effluent COD Cr It is 1860mg / L.

[0042] 1500 mL of 6% aqueous sodium hydroxide solution was passed through the resin bed in co-current flow at a temperature of 40±5° C. at a flow rate of 1500 mL / h for desorption. The desorbed high-concentration nitrobenzene sulfonic acid sodium salt solution can be sent to coal-water slurry or concentrated and sent to incineration. The low-concentration desorption solution is used to prepare the aqueous sodium hydroxide solution for the next batch of desorption.

[0043] (2) Secondary adsorption...

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PUM

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Abstract

The process of treating waste water from m-dinitrobenzene production includes the following main steps: regulating acidity of the waste water, standing, filtering and adsorbing in macroporous resin filling adsorption tower; stopping adsorption after reaching the first falloff point and desorption regenerating with sodium hydroxide aqua as desorbent; regulating acidity for the second time and adsorbing in macroporous resin filling adsorption tower for the second time; stopping adsorption after reaching the second falloff point and desorption regenerating with sodium hydroxide aqua as desorbent; and regulating acidity, decolorizing in adsorption tower filled with active carbon to obtain colorless transparent water. The said process can treat waste water from m-dinitrobenzene production to exhaust standard, and the adsorption resin may be regenerated for reuse.

Description

1. Technical field [0001] The invention relates to a method for treating waste water produced in the production process of m-dinitrobenzene, more specifically, a method for separating nitrobenzene sulfonate from waste water of m-dinitrobenzene production. 2. Background technology [0002] Meta-dinitrobenzene is mainly used as intermediates in dyes, pigments and other organic synthesis. Wastewater COD discharged from its production Cr Up to 10000~15000mg / L, containing sodium o-nitrobenzene sulfonate, sodium p-nitrobenzene sulfonate, a very small amount of m-dinitrobenzene and other organic pollutants and Na 2 SO 3 , NaNO 2 and other inorganic pollutants. Due to the high salt content and high toxicity of this wastewater, it is difficult to use conventional biochemical and chemical oxidation methods. At the same time, since the main components of wastewater are nitro compounds, which are strong carcinogens, discharge into water bodies will cause serious harm to human health...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/28C02F1/42C02F1/58C02F1/66
Inventor 潘丙才苏庆韩永忠张全兴陈金龙肖志庆
Owner NANJING UNIV
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