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Waste water treatment method in preparation of para-amiophenyl by electrolytic process

A technology of p-aminophenol and a treatment method, applied in the field of wastewater treatment, can solve the problems of environmental pollution, insufficient rationality and economy of treatment process, loss of PAP and the like

Inactive Publication Date: 2005-05-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

About 13 tons of waste water is produced for every ton of PAP produced. If it is directly discharged, it will not only pollute the environment, but also cause (NH 4 ) 2 SO 4 and loss of PAP
[0003] At present, regarding the treatment method of this type of waste water, only see the method reported in the patent document CN1168865A, although this treatment method has considered to (NH 4 ) 2 SO 4 and PAP recovery treatment, but the entire treatment process is still insufficient in terms of rationality and economy

Method used

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  • Waste water treatment method in preparation of para-amiophenyl by electrolytic process
  • Waste water treatment method in preparation of para-amiophenyl by electrolytic process

Examples

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Effect test

Embodiment 1

[0016] 1. Take 65L of waste water, light yellow, pH = 7.0, specific gravity 1.12. This batch of waste water is made of 6.25 kg of nitrobenzene, 6.8 kg of sulfuric acid and an appropriate amount of water to participate in the electrolysis reaction, after treatment, purification and separation of PAP.

[0017] 2. After adsorbing PAP through the adsorption column of fruit shell activated carbon [1kg, divided into 3 levels, each level is 1m (the working section is 0.7m), the particle size of the fruit shell activated carbon is 8-20 mesh (the linear velocity of wastewater in the adsorption column is 0.15- 0.3m / s, the adsorption temperature is 55~60℃), the solution is colorless and transparent, the specific gravity is 1.12, pH=7.0, based on the adsorption raw material liquid PAP inlet concentration of 1.3g / L, the actual adsorption liquid PAP outlet concentration is less than 10 -4 g / L, the PAP adsorption rate is greater than 99%.

[0018] 3. Send the above-mentioned liquid obtained ...

Embodiment 2

[0025] Repeat the first item of Example 1, 1 kg of fruit shell activated carbon is equally divided into 5 parts, and cross-flow adsorption is performed in a stirred tank. After 5 stages of cross-flow adsorption, the PAP concentration is 0.24g / l. In this case, the adsorption solution is as described in Example 1. Middle 3-5 step method processes, reclaims gained (NH 4 ) 2 SO 4 The quality does not meet the requirements of industrial purity, its organic content> 0.1%, (NH 4 ) 2 SO 4 The color of the skin is white at first, and becomes slightly brownish red after 1 day, and becomes darker and darker after a few days.

Embodiment 3

[0027] Repeat the 1st to the 5th item of embodiment one, but the 6th step gac regeneration, adopt 18%H 2 SO 4 The aqueous solution flows through the activated carbon adsorption column continuously and slowly for desorption, adopts the leaching method for desorption and the leaching time is less than 5 hours, and other conditions are not within the scope of the operating conditions of step 6 in Example 1. Facts have proved that the regeneration rate of activated carbon at this time is <70%, and it cannot be recycled.

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Abstract

The invention discloses a wastewater treatment method in an electrolysis process of p-aminophenol. In the method, the p-aminophenol is removed by adsorption of fruit shell activated carbon, and then the waste water is evaporated and concentrated to recover industrial-grade ammonium sulfate, and the recovery rate of the ammonium sulfate is greater than 98%. The evaporated water is used to prepare 18% sulfuric acid aqueous solution and enters the electrolytic cell as electrolyte to realize the closed circulation of water. The fruit shell activated carbon that adsorbs p-aminophenol can use 18 (wt)% sulfuric acid aqueous solution as a desorption agent to regenerate the activated carbon (the unit consumption of activated carbon is about 50 kg / ton PAP), and the desorption solution can be returned to the electrolytic cell to participate in electrolysis reaction, therefore, the waste water treatment method of the present invention is a zero discharge, environmentally friendly waste water treatment method.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for treating waste water produced in the process of preparing p-aminophenol by electrolysis. Background technique [0002] The wastewater produced in the process of preparing p-aminophenol by electrolysis mainly contains (NH 4 ) 2 SO 4 , about 13-18 (wt)%; p-aminophenol (PAP), about 1.3g / l; its pH=6.9-7.1, and its specific gravity is 1.12. About 13 tons of waste water is produced for every ton of PAP produced. If it is directly discharged, it will not only pollute the environment, but also cause (NH 4 ) 2 SO 4 and PAP loss. [0003] At present, regarding the treatment method of this type of waste water, only see the method reported in the patent document CN1168865A, although this treatment method has considered to (NH 4 ) 2 SO 4 And PAP recovery treatment, but its whole treatment process is still insufficient in terms of rationality and economy. Therefore, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04C02F1/28
Inventor 张秋香赵培陈敏恒
Owner EAST CHINA UNIV OF SCI & TECH
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