Treatment method of 2,4-dinitrochlorobenzene production waste water and equipment implementing method

A technology for dinitrochlorobenzene and waste water production, which is applied in the fields of natural water treatment, adsorption water/sewage treatment, water/sewage multi-stage treatment, etc. In order to achieve the effect of improving product yield, reducing COD value and reasonable connection method

Inactive Publication Date: 2019-03-29
浙江长征化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 2,4-dinitrochlorobenzene and 2,4-dinitrophenol sodium are not biodegradable, and have certain toxicity and inhibition to biochemical sludge
Therefore, without recycling, the yield of the product will also be reduced, and the pollution to the environment will be increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0034] The first embodiment of the present invention provides a kind of treatment method of 2,4-dinitrochlorobenzene production waste water, comprises the following steps:

[0035] Precipitation step: after the 2,4-dinitrochlorobenzene production wastewater is precipitated, the solid component and the liquid component are separated, and the solid component is recovered;

[0036] Wherein, the solid component contains 2,4-dinitrochlorobenzene, and the liquid component contains water, acid and a small amount of 2,4-dinitrochlorobenzene dissolved in the acid.

[0037] Adsorption step: using a resin adsorption device to perform adsorption treatment on the liquid component;

[0038] Desorption step: use a desorption agent to perform desorption treatment on the resin adsorption device after the adsorption treatment, and then separate to obtain a desorption liquid.

[0039] In the desorption liquid obtained in the present invention, different components can be obtained according to t...

no. 2 approach

[0049] The second embodiment of the present invention provides a kind of equipment for implementing the treatment method of 2,4-dinitrochlorobenzene production wastewater of the present invention, including: a connected precipitation device, a first separation device, a resin adsorption device and a second separation device.

[0050] The first separation device and / or the second separation device includes: 2-4 microfilters connected in series in sequence, and the microfilters are equipped with filter screens with a pore size of 30-80 μm; preferably, the first Both the separation device and the second separation device include 2-4 microfilters connected in series in sequence, generally the outlet of the upper stage microfilter is connected to the inlet of the next stage microfilter, and so on. Generally speaking, the inlet of the first separation device or the second separation device is the inlet of the first-stage microfilter, and the outlet of the first separation device or ...

Embodiment 1

[0066] Measure 26500mL of 2,4-dinitrochlorobenzene production wastewater after three-stage precipitation (that is, the liquid component, its 2,4-dinitrochlorobenzene content is 390ppm, and its COD is 2650ppm), and it is continuously connected to a 70mL The activated D101 macroporous adsorption resin exchange column is used for adsorption, the adsorption flow rate is controlled to 1.0BV / h, and the adsorption is continued until the adsorption is saturated. The waste water after adsorption is detected as 2,4-dinitrochlorobenzene by HPLC The content is 15ppm, and its COD is 50ppm.

[0067] With the exchange column equipped with D101 macroporous adsorption resin after adsorption, measure 80ml of hot 5% sodium hydroxide solution for desorption treatment, control the desorption flow rate to be 1.0BV / h, and obtain 85ml of desorption liquid, after analysis The content of sodium 2,4-dinitrophenolate is 11.5%, and the purity of sodium 2,4-dinitrophenolate is 97.6% as detected by HPLC.

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Abstract

The invention provides a treatment method of 2,4-dinitrochlorobenzene production waste water and equipment implementing the method. The treatment method comprises the following steps including a precipitation step: precipitating 2,4-dinitrochlorobenzene production waste water; performing separation to obtain solid ingredients and liquid ingredients; an adsorption step: using a resin adsorption device to perform adsorption treatment on the liquid ingredients; a desorption step: performing desorption treatment on the resin adsorption device subjected to adsorption treatment by using a desorptionagent; performing separation to obtain desorption liquid. The treatment method of the 2,4-dinitrochlorobenzene production waste water can be used for obtaining 2,4-sodium dinitrophenol through recovery, so that the yield of the product is improved; the load impact of the sewage biochemical treatment is reduced. The 2,4-sodium dinitrophenol obtained through recovery can be used for producing vulcanized black dye. In addition, after the waste water is treated, the COD value can be greatly reduced.

Description

technical field [0001] The invention relates to a method for treating waste water produced by 2,4-dinitrochlorobenzene and equipment for implementing the method, belonging to the field of environmental protection. Background technique [0002] 2,4-Dinitrochlorobenzene is an important chemical intermediate in the fields of dyes, pesticides, and medicine. In terms of dye synthesis, 2,4-dinitrochlorobenzene can be used to prepare 6-chloro-2,4-dinitroaniline; 2,4-dinitrochlorobenzene can also be used to synthesize sulfur black dyes. Therefore, 2,4-dinitrochlorobenzene is an important dye intermediate. [0003] 2,4-Dinitrochlorobenzene mainly uses chlorobenzene or p-nitrochlorobenzene as a raw material, and is nitrated with mixed acid, separated and washed with water to obtain 2,4-Dinitrochlorobenzene. During the washing process, there are a small amount of 2,4-dinitrochlorobenzene and 2,4-sodium dinitrophenolate in the waste water which needs to be treated for waste water. Ho...

Claims

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Application Information

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IPC IPC(8): C02F9/02C07C201/12C07C205/23C02F103/36
CPCC02F1/28C02F9/00C02F2001/007C02F2103/36C02F2303/16C07C201/12C07C205/23
Inventor 金永辉阮国涛赵锋高国新王敏
Owner 浙江长征化工有限公司
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