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A method for extracting m-aminobenzenesulfonic acid from dye intermediate waste water

A technology of m-aminobenzenesulfonic acid and dye intermediates, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve the problems of increasing waste water treatment costs, waste of resources and the like, and achieves solutions to waste of resources and low cost. , the effect of stable process

Active Publication Date: 2021-02-05
自然资源部天津海水淡化与综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, electrolysis, ion exchange, incineration and biochemical treatment are usually used to treat this type of wastewater. The above treatment technologies all degrade the organic matter in the wastewater through oxidation-reduction reactions, which increases the cost of wastewater treatment and causes huge waste of resources
For example, m-aminobenzenesulfonic acid in dye intermediate wastewater has high economic value, and the existing wastewater treatment methods have failed to make it effectively utilized

Method used

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  • A method for extracting m-aminobenzenesulfonic acid from dye intermediate waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment a

[0025] S1a, adjust pH

[0026] Under continuous stirring, adding a mass concentration of 30% NaOH aqueous solution to 3487g (3L) m-aminobenzenesulfonic acid wastewater to adjust the wastewater pH to 10;

[0027] S2a, evaporation and concentration

[0028] Evaporate and concentrate the wastewater after pH adjustment of S1a to a solid content of about 40%. At this time, the temperature of the evaporation system is 108°C;

[0029] S3a, cooling and crystallization

[0030] After slowly cooling the evaporation system of S2a to room temperature, solid-liquid separation obtained 546 g of crude salt and 827 g of evaporated mother liquor;

[0031] S4a, frozen crystallization

[0032] The evaporated mother liquor obtained by solid-liquid separation of S3a was frozen at -5°C for 6 hours, and 19 g of frozen salt and 808 g of frozen mother liquor were obtained by solid-liquid separation;

[0033] S5a, acidification precipitation

[0034] Slowly add sulfuric acid aqueous solution with ...

Embodiment b

[0038] S1b, adjust pH

[0039] Under continuous stirring, mix the acidified mother liquor 776g and the refined mother liquor 328g with 3487g (3L) initial m-aminobenzenesulfonic acid wastewater in Example a, and add a NaOH aqueous solution with a mass concentration of 30% therein to adjust the pH of the wastewater to 10;

[0040] S2b, evaporation and concentration

[0041] Evaporate and concentrate the wastewater after adjusting the pH of S1b to a solid content of about 48%. At this time, the temperature of the evaporation system is 108.2°C;

[0042] S3b, cooling and crystallization

[0043] After slowly cooling the S2b evaporation system to room temperature, solid-liquid separation obtained 771 g of crude salt and 824 g of evaporated mother liquor;

[0044] S4b, frozen crystallization

[0045] The evaporated mother liquor obtained by solid-liquid separation of S3b was frozen at -5°C for 6 hours, and 21 g of frozen salt and 803 g of frozen mother liquor were obtained by soli...

Embodiment c

[0051] S1c, adjust pH

[0052] Under continuous stirring, 777g of the acidified mother liquor and 386g of the refined mother liquor in Example b were mixed uniformly with 3487g (3L) of the initial m-aminobenzenesulfonic acid wastewater, and the aqueous solution of NaOH with a mass concentration of 30% was added thereto to adjust the pH of the wastewater to 10;

[0053] S2c, evaporation and concentration

[0054] Evaporate and concentrate the waste water after pH adjustment by S1c to a solid content of about 52%. At this time, the temperature of the evaporation system is 108.5°C;

[0055] S3c, cooling and crystallization

[0056] After slowly cooling the evaporation system of S2c to room temperature, solid-liquid separation obtained 877g of crude salt and 816g of evaporated mother liquor;

[0057] S4c, frozen crystallization

[0058] The evaporated mother liquor obtained by solid-liquid separation of S3c was frozen at -5°C for 6 hours, and 16 g of frozen salt and 800 g of fr...

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Abstract

The invention discloses a method for extracting m-aminobenzenesulfonic acid from dye intermediate waste water, adding lye to the dye intermediate waste water to adjust the pH of the waste water, evaporating and concentrating the waste water after pH adjustment, and evaporating and concentrating the waste water Cool to room temperature, separate solid-liquid to obtain crude salt and evaporated mother liquor, freeze evaporated mother liquor to obtain frozen salt and frozen mother liquor, further remove organic impurities, add acid to the frozen mother liquor to adjust pH to acidify and precipitate, and separate solid-liquid to obtain meta-amino Crude benzenesulfonic acid and acidified mother liquor, adding the crude m-aminobenzenesulfonic acid to water for washing, solid-liquid separation to obtain m-aminobenzenesulfonic acid product and refined mother liquor, the acidified mother liquor produced during the acidification process and the refined mother liquor produced during the refining process are returned to the initial wastewater recycling. The m-aminobenzenesulfonic acid product extracted by the method has high purity and good recovery rate, helps to solve environmental pollution and resource waste, greatly improves the economic benefits of wastewater treatment, and is suitable for industrial production.

Description

technical field [0001] The invention relates to high-salt wastewater resource utilization technology, in particular to the resource utilization of dye intermediate wastewater, in particular to a technical method for extracting m-aminobenzenesulfonic acid from dye intermediate wastewater. Background technique [0002] With the rapid development of my country's industry, more and more high-salt wastewater is produced in the daily production of petroleum, chemical, metallurgical and electric power industries. The chemical oxygen demand (COD) index and salt content of wastewater are very high. pose a great threat to the ecological environment. In addition to its high salt content, industrial wastewater also contains a large amount of toxic and refractory organic matter. At present, electrolysis, ion exchange, incineration, and biochemical treatment are usually used to treat this type of wastewater. The above treatment technologies degrade the organic matter in the wastewater thr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/44C07C309/46
CPCC07C303/44C07C309/46
Inventor 李涛王泽江郝晓翠段梦姗张欣骆碧君张琦黄西平
Owner 自然资源部天津海水淡化与综合利用研究所