Method for removing acetic acid in disperse red dye wastewater

A dye wastewater and disperse red technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve problems such as secondary pollution of sulfuric acid, increase esterification rate, increase reaction speed, increase The effect of esterification reaction rate

Active Publication Date: 2021-11-05
DESIGN ENG OF SYRICI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methyl acetate is generated, and the separated ester is hydrolyzed to recover acetic acid and methanol. The disadvantage of this method is that sulfuric acid is generated to cause secondary pollution.

Method used

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  • Method for removing acetic acid in disperse red dye wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, a cutting coil with stirring function is installed in the reactor, and one end of the coil is connected by a wire to form a closed loop. The reactor is equipped with a magnetic pole, and the two magnetic poles are connected by a wire, and a heating device is installed at the bottom of the reactor; among them, the cutting coil and the speed control connected to the device. Turn on the tachometer 5 to control the coil cutting speed and stirring speed. The outlet of reaction kettle 1 is connected to the feed port of rectification tower 6 through pipelines, and the inlet on one side of rectification tower 6 is connected to reboiler 8; In the tower body, the low-boiling volatile fraction enters the condenser 7, and after the reflux is controlled by the reflux valve 9, the fraction flows out of the condenser.

[0022] Approach:

[0023] The COD of the disperse red dye wastewater to be treated is 17000mg / L, and the acetic acid content is about 1%....

Embodiment 2

[0028] The difference from Example 1 is:

[0029] Approach:

[0030] The COD of the disperse red dye wastewater to be treated is 17000mg / L, and the acetic acid content is about 1%.

[0031] The disperse red dye waste water and methanol to be treated are entered successively through the feed port of the rectification reactor, 1 kg of disperse red dye waste water, and 0.25 kg of methanol (analytical pure), in order to avoid the surfactant in the waste water from producing a large amount of foam during the rectification process , and then add 0.05 g of silicone defoamer. Turn on the electromagnetic equipment, the reflux temperature rises to 65°C, the magnetic field strength is 0.5T, and the temperature rises to reflux for magnetoelectric catalysis. The electric field generated inside the reactor can change the internal potential difference of the electrolyte to promote the esterification reaction. After 10 minutes of the esterification reaction, the Pressure (0~0.2MPa), when th...

Embodiment 3

[0034] The difference from Example 1 is:

[0035] Approach:

[0036]The COD of the disperse red dye wastewater to be treated is 17000mg / L, and the acetate content is 1%. The disperse red dye waste water and methanol to be treated are entered successively through the feed port of the rectification reactor, 1 kg of disperse red dye waste water, and 0.5 kg of methanol (analytical pure), in order to avoid the surfactant in the waste water from producing a large amount of foam during the rectification process , and then add 0.05 g of silicone defoamer. Turn on the electromagnetic equipment, the reflux temperature rises to 65°C, the magnetic field strength is 0.4T, and the temperature rises to reflux for magnetoelectric catalysis. The electric field generated inside the reactor can change the internal potential difference of the electrolyte to promote the esterification reaction. After 10 minutes of the esterification reaction, the Pressure (0~0.2MPa), when the temperature of the ...

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Abstract

The invention relates to the field of chemical environmental protection, and in particular, relates to a method for removing acetic acid in disperse red dye wastewater. Disperse red dye wastewater is used as a raw material, alcohol is added, acetic acid and alcohol in the wastewater are subjected to an esterification reaction through magnetoelectric catalysis, and then acetic acid in the wastewater is separated and removed through rectification. According to the method disclosed by the invention, the addition of strong acid in the esterification reaction process is replaced under the magnetoelectric catalytic action, the generation of carnallite at the tail end of the wastewater is avoided, the esterification reaction efficiency is improved, and the target of separating acetic acid from the wastewater is effectively realized.

Description

technical field [0001] The invention is designed in the field of chemical industry and environmental protection, and in particular relates to a method for removing acetic acid in disperse red dye wastewater. Background technique [0002] In the production process of disperse dyes, affected by the production process of diazotization coupling reaction, a large amount of mother liquor wastewater and washing water are produced, and contain a large amount of acetic acid and organic compounds. This wastewater has the characteristics of strong acidity, high chroma and high COD mass concentration. It is difficult to achieve standard discharge or resource reuse in biochemical treatment. The existence of acetic acid in wastewater increases the cost of neutralizing alkali. Therefore, the separation of acetic acid is the main problem in solving wastewater. [0003] The main methods for treating acetic acid at this stage are: electrodialysis technology, which utilizes the selective perme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C25B3/07C02F101/30C02F101/38
CPCC02F9/00C25B3/07C02F1/481C02F1/46104C02F1/461C02F1/048C02F1/20C02F2101/308C02F2101/38C02F2303/12C02F2209/08
Inventor 姜雪松马文静杨洪新胡金玲
Owner DESIGN ENG OF SYRICI
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