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Extracting and separating method and device for waste acid generated in production procedure of m-dinitrobenzene

A technology for the production process of m-dinitrobenzene, which is applied in the field of extraction, separation and installation of waste acid produced in the production process of m-dinitrobenzene, and can solve the problems of high energy consumption cost, high safety, and high content of nitrates , achieve the effect of low energy consumption cost, high separation efficiency and small investment

Inactive Publication Date: 2012-12-26
LIAONING QINGYANG SPECIAL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high nitrate content in waste acid after traditional kettle extraction, high energy consumption cost and high safety of follow-up treatment, and proposes a method for producing waste acid in the production process of m-dinitrobenzene Extraction separation method and device

Method used

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  • Extracting and separating method and device for waste acid generated in production procedure of m-dinitrobenzene
  • Extracting and separating method and device for waste acid generated in production procedure of m-dinitrobenzene

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A kind of extraction separation method that produces waste acid in the m-dinitrobenzene production process of the present invention, concrete steps are as follows:

[0026] Step 1, put benzene and waste acid with a mass concentration of 68% into the injector 5 for mixing, the volume ratio of benzene and waste acid is 7:1, and a mixed solution is obtained;

[0027] Step 2. Spray the mixed solution obtained in Step 1 to the static mixing tube 6 with the injector 5. The temperature in the static mixing tube is 20-22° C., fully mixed, and the extraction process is completed at the same time, and the mixed solution extracted by benzene will be obtained;

[0028] Step 3, the benzene-extracted mixed solution in step 2 flows into the inclined plate separator 7 for separation, and the angle of inclination of the inclined plate separator 7 is 30°, so as to obtain acidic benzene and the extracted waste acid solution;

[0029] Step 4, the acidic benzene obtained in step 3 is transf...

Embodiment 2

[0034] Step 1, put benzene and waste acid with a mass concentration of 70% into the injector 5 for mixing, the volume ratio of benzene and waste acid is 7.5:1, to obtain a mixed solution;

[0035] Step 2. Spray the mixed solution obtained in Step 1 to the static mixing tube 6 with the injector 5. The temperature in the static mixing tube is 24-28° C., fully mixed, and the extraction process is completed at the same time, and the mixed solution extracted by benzene will be obtained;

[0036] Step 3, the benzene-extracted mixed solution in step 2 flows into the inclined plate separator 7 for separation, and the angle of inclination of the inclined plate separator 7 is 45°, so as to obtain acidic benzene and the extracted waste acid solution;

[0037] Step 4, the acidic benzene obtained in step 3 is transferred to the acidic benzene transfer tank 8, and the extracted waste acid solution obtained in step 3 is transferred to the waste acid storage tank 9, and its nitrate content is ...

Embodiment 3

[0042] Step 1, put benzene and waste acid with a mass concentration of 73% into the injector 5 for mixing, the volume ratio of benzene to waste acid is 8:1, and a mixed solution is obtained;

[0043] Step 2. Spray the mixed solution obtained in Step 1 to the static mixing tube 6 with the injector 5. The temperature in the static mixing tube is 27-31° C., fully mixed, and the extraction process is completed at the same time, and the mixed solution extracted by benzene will be obtained;

[0044]Step 3, the benzene-extracted mixed solution in step 2 flows into the inclined plate separator 7 for separation, and the angle of inclination of the inclined plate separator 7 is 40°, so as to obtain acidic benzene and the extracted waste acid solution;

[0045] Step 4, the acidic benzene obtained in step 3 is transferred to the acidic benzene transfer tank 8, and the extracted waste acid solution obtained in step 3 is transferred to the waste acid storage tank 9, and its nitrate content i...

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Abstract

The invention relates to an extracting and separating method and a device for waste acid generated in the production procedure of m-dinitrobenzene, which belong to the technical field of chemical engineering. By applying the principle of an extraction technology, the invention provides a process for finishing the extraction of a nitro compound in waste acid generated in the production procedure of m-dinitrobenzene by utilizing an ejector and a static mixing pipe and also realizing liquid-liquid separation by a tilted plate separator. According to the extracting and separating method and the device for the waste acid generated in the production procedure of the m-dinitrobenzene, waste acid with the mass concentration of 68 to 75 percent, which is generated in the production procedure of benzene and m-dinitrobenzene, is mixed by the ejector, is mixed by the static mixing pipe and is separated by the tilted plate separator, so that nitrobenzene and dinitrobenzene in the waste acid are extracted, and the content of nitro matters and nitric acid in the waste acid is lowered. According to the extracting and separating method and the device for the waste acid generated in the production procedure of the m-dinitrobenzene, liquid is ejected in a fog shape after the liquid passes through the ejector, and is also mixed by the static mixing pipe fully so as to finish an extraction reaction. The content of a nitrated compound in the waste acid with the m-dinitrobenzene is lowered below 0.1 percent after separation from 0.6 to 0.7 percent before separation, the waste acid after being extracted is in concentrating treatment again, the energy consumption and the cost are low, and the pollution of the environment is lowered.

Description

technical field [0001] The invention relates to an extraction and separation method and device for waste acid produced in the production process of m-dinitrobenzene, and belongs to the technical field of chemical industry. Background technique [0002] m-Dinitrobenzene is one of the important organic intermediates, and its current production process mainly includes three main processes: first-stage nitration, second-stage nitration and refining. Among them, the process waste acid produced by the second-stage nitration is used for the first-stage use. After the first-stage nitration, the waste acid with a mass concentration of 68-75% still contains nitrates with a mass concentration of 0.6%-0.7%. Concentrated treatment of waste acid, only part of the nitrates are digested, and most of the nitrates and nitrogen oxides are brought into the decompression water, causing the concentration of nitrates in the decompression water to exceed the standard, forming a pollution source. I...

Claims

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Application Information

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IPC IPC(8): B01D11/04
Inventor 缪承蛟吕文方董俊旭樊吉全树新王宝忠
Owner LIAONING QINGYANG SPECIAL CHEM
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