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Waste water treatment method in 1-naphthylamine-4-sodium sulfonate production process

A production process and wastewater treatment technology, applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as environmental pollution, re-pollution, expensive treatment costs, etc., to reduce production Cost, solution to pollution, effect of saving raw materials

Inactive Publication Date: 2011-06-29
洛阳市东亮化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, various manufacturers generally use spray drying, drying cylinder drying, etc. to treat waste liquid, but a large amount of mixed salt solids are produced; the energy consumption is high, and the mixed salt composition of the leftovers is complex, which cannot be recycled and easily causes re-pollution
Even if the waste liquid is sent to the sewage treatment plant, the waste liquid is difficult to treat because of its high salt concentration, high organic matter content, COD value of more than 10,000, chromaticity of more than 2,000 times, and high toxicity. Even the treatment cost is very expensive
As a result, many enterprises secretly discharge waste water, causing serious pollution to the environment.
At present, there are many manufacturers of sodium 1-naphthylamine-4-sulfonate in China, and the annual production capacity of each manufacturer is about 3,000 tons. However, there are generally no effective measures for the treatment of wastewater such as crystallization mother liquor.

Method used

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  • Waste water treatment method in 1-naphthylamine-4-sodium sulfonate production process
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  • Waste water treatment method in 1-naphthylamine-4-sodium sulfonate production process

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kettle 1-naphthylamine-4-sodium sulfonate production process waste liquid, which contains 1-naphthylamine-4-sodium sulfonate 10.2%, sodium sulfate 9.9%, sodium carbonate 4.7%, specific gravity is 1.20, and the total weight is 2880kg. Under the condition of 20° C., 127.0 kg of 98% sulfuric acid was added thereto under stirring state, and reacted for 90 minutes to obtain a reaction solution with a pH value of 6.9. Then put the reaction solution into the cooling crystallization pot to cool down to 13°C, and gradually precipitate a large amount of Na 2 SO 4 Crystalline hydrate, the crystallized slurry is placed in a centrifuge to separate Na 2 SO 4 Crystal Hydrate and Crystal Mother Liquor. get Na 2 SO 4 Crystal hydrate 470kg. Na can be washed with water if necessary 2 SO 4 Crystalline hydrate 1-3 times, and continue to dry. 11.7% of sodium 1-naphthylamine-4-sulfonate and 8.6% of sodium sulfate in the crystallization mother liquor have a specific gravity of 1.17...

Embodiment 2

[0032] A kettle 1-naphthylamine-4-sodium sulfonate production process waste liquid, which contains 1-naphthylamine-4-sodium sulfonate 9.9%, sodium sulfate 9.8%, sodium carbonate 5.1%, specific gravity is 1.19, and the total weight is 2720kg. Under the condition of 40° C., 126 kg of 98% sulfuric acid was added thereto under stirring state, and reacted for 90 minutes to obtain a reaction solution with a pH value of 7.05. Then put the reaction solution into the cooling crystallization pot to cool down to 10°C, and gradually precipitate a large amount of Na 2 SO 4 The crystal hydrate is crystallized, and the crystallized slurry is put into a centrifuge to separate the Na 2 SO 4 Crystal hydrate crystallization and crystallization mother liquor. get Na 2 SO 4 530kg of crystal hydrate crystals. Na can be washed with water if necessary 2 SO 4 The crystalline hydrate crystallized 1-3 times, and continued to spin dry. 11.7% of sodium 1-naphthylamine-4-sulfonate and 6.8% of sod...

Embodiment 3

[0034] A kettle 1-naphthylamine-4-sodium sulfonate production process waste liquid contains 10.8% of 1-naphthylamine-4-sodium sulfonate, 9.9% of sodium sulfate, 4.8% of sodium carbonate, a specific gravity of 1.18, and a total weight of 2780kg. Under the condition of 20° C., 125.8 kg of 98% sulfuric acid was added thereto under stirring state, and reacted for 80 minutes. The final temperature was 50° C. to obtain a reaction solution with a pH value of 7.4. Put the reaction solution into the cooling crystallization pot to cool down to 0°C, and gradually precipitate a large amount of Na 2 SO 4 Crystalline hydrate, the crystallized slurry is placed in a centrifuge to separate Na 2 SO 4 Crystal Hydrate and Crystal Mother Liquor. get Na 2 693kg of SO crystal hydrate. The crystallization mother liquor contains 13.7% of sodium 1-naphthylamine-4-sulfonate, 3.8% of sodium sulfate, and a specific gravity of 1.168. The crystallization mother liquor continues to be used as the conc...

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Abstract

The invention introduces a waste water treatment method in 1-naphthylamine-4-sodium sulfonate production process, and is characterized by adding quantitative sulfuric acid in waste water, which contains 1-naphthylamine-4-sodium sulfonate, sodium carbonate and sodium sulfate and is produced by the 1-naphthylamine-4-sodium sulfonate production process, so as to convert sodium carbonate into sodium sulfate, then cooling to precipitate Na2SO4 crystalline hydrate and separate crystallization mother liquor, and continuing to use the mother liquor to neutralize the concentration of the reaction process and the proportion regulating solution. The invention solves the pollution to environment cause by the waste water produced by the 1-naphthylamine-4-sodium sulfonate production process, and basically realizes zero discharge of crystallization mother liquor; the treatment cost is low; the energy consumption is small; Na2SO4 and 1-naphthylamine-4-sodium sulfonate can be recycled; the mother liquor can continue to be used for neutralizing the regulating solution of the reaction process; and the raw material is saved.

Description

technical field [0001] The invention relates to a production technology of 1-naphthylamine-4-sodium sulfonate, in particular to a method for treating wastewater in the production process of 1-naphthylamine-4-sodium sulfonate. Background technique [0002] 1-naphthylamine-4-sodium sulfonate is an azo dye intermediate used in the production of nivenic acid, and can also be used as an antidote for nitrite and iodine poisoning. [0003] At present, the main production method of 1-naphthylamine-4-sodium sulfonate is to be produced by menadylamine sulfonation method, and its main production process is: behind the menaphthylamine dissolving and sulfuric acid are drawn into sulfonation still by vacuum, sulfonation The specific process of the conversion is that menaphthylamine first reacts with sulfuric acid to generate the sulfate salt of menaphthylamine, then converts under heating and vacuum conditions to generate 1-naphthylamine-4-sulfonic acid, and puts water into the neutraliza...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/36C07C303/32C01D5/02C07C309/47C02F1/38
Inventor 段洪涛段冬冬段晓亮
Owner 洛阳市东亮化工有限公司
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