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Method for treating phenolic wastewater in high-concentration hydrochloric acid

A treatment method and technology for phenolic wastewater, applied in water/sewage treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult wastewater treatment, high operating cost, and complicated process, and achieve The effect of the treatment effect is stable

Pending Publication Date: 2021-09-07
湖北兴发环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of ultraviolet absorbers, trichlorotoluene and resorcinol are used as raw materials. During the production process, due to the hydrolysis of trichlorotoluene, high-concentration hydrochloric acid will be produced, and there will be unreacted resorcinol and newly produced All kinds of phenolic compounds, these two substances exist in the production wastewater at the same time, which makes it difficult to treat this kind of wastewater. At present, the method of neutralization + evaporation + biochemical treatment is mainly used for this type of wastewater. Complicated and expensive to run

Method used

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  • Method for treating phenolic wastewater in high-concentration hydrochloric acid

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Effect test

Embodiment 1

[0028] A chemical company produces wastewater in the process of producing ultraviolet absorbers. The content of hydrochloric acid is 20.5%, and the content of phenol is 300mg / L. This method is adopted for treatment. The specific treatment steps are as follows:

[0029] Step 1): Heating the waste water to 70°C, constant temperature,

[0030] Step 2): Dosing formaldehyde solution in the phenolic reaction kettle, the dosage is 1.1 times the mass of phenol in the wastewater, and the reaction lasts for 4 hours;

[0031] Step 3): Filter the product after the reaction in the previous step with a filter press.

[0032] Step 4): The filtrate after press filtration is treated with a resin column with a height-to-diameter ratio of 10:1 and an operating flow rate of 1.5BV / h.

[0033] After being treated by this method, the content of phenol in the terminal effluent is 0.5 mg / L, and the content of hydrochloric acid is 20.5%, and the hydrochloric acid can be recycled to production for reus...

Embodiment 2

[0035] A chemical company produces wastewater in the process of producing ultraviolet absorbers. The content of hydrochloric acid is 20%, and the content of phenol is 350mg / L. This method is adopted for treatment. The specific treatment steps are as follows:

[0036] Step 1): Heating the waste water to 70°C, constant temperature,

[0037] Step 2): Dosing formaldehyde solution in the phenolic reaction kettle, the dosage is 1.2 times the mass of phenol in the wastewater, and the reaction lasts for 4 hours;

[0038] Step 3): Filter the product after the reaction in the previous step with a filter press.

[0039] Step 4): The filtrate after press filtration is treated with a resin column with a height-to-diameter ratio of 10:1 and an operating flow rate of 1.5BV / h.

[0040] After being treated by this method, the content of phenol in the terminal effluent is 0.8 mg / L, and the content of hydrochloric acid is 20%, and the hydrochloric acid can be recycled to production for reuse. ...

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Abstract

The invention relates to a method for treating phenol-containing wastewater in high-concentration hydrochloric acid, the concentration of hydrochloric acid in the phenol-containing wastewater in the high-concentration hydrochloric acid is as high as 15-25%, and the phenol content is 250-350mg / L. The method comprises the following steps: heating the high-concentration hydrochloric acid phenol-containing wastewater to 70 DEG C, keeping the temperature constant, then adding a formaldehyde solution for reaction, carrying out filter pressing after the reaction is completed, and treating the filter pressing liquid after filter pressing through resin. According to the method for treating the phenol-containing wastewater in the high-concentration hydrochloric acid, pure hydrochloric acid can be obtained after treatment through the method and reused for production, and meanwhile, the removal rate of phenolic substances reaches up to 98% or above. The treatment method has the advantages of obvious phenol-containing organic matter removal effect, low treatment cost, stable and reliable process and the like.

Description

technical field [0001] The invention relates to the field of comprehensive wastewater treatment, in particular to a method for treating wastewater containing phenol in high-concentration hydrochloric acid. Background technique [0002] In the production process of ultraviolet absorbers, trichlorotoluene and resorcinol are used as raw materials. During the production process, due to the hydrolysis of trichlorotoluene, high-concentration hydrochloric acid will be produced, and there will be unreacted resorcinol and newly produced All kinds of phenolic compounds, these two substances exist in the production wastewater at the same time, which makes it difficult to treat this kind of wastewater. At present, the method of neutralization + evaporation + biochemical treatment is mainly used for this type of wastewater. Complicated and expensive to run. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention provides a met...

Claims

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Application Information

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IPC IPC(8): C02F9/04C08G8/08C01B7/07C02F101/34C02F101/12
CPCC02F1/58C02F1/001C08G8/08C01B7/0706C02F2101/345C02F2101/12
Inventor 袁木平张波郑巍刘舜杨超龙崔建宇屠宏飞刘超宇胡柏
Owner 湖北兴发环保科技有限公司
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