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Pretreatment method for wastewater produced in o-isopropoxyphenol production process

A technology for ortho-isopropoxyphenol and wastewater production, which is applied in water/sewage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of high oxidant cost, complex process, and high cost , to achieve the effect of low operating cost, simple operation and small investment

Active Publication Date: 2017-12-26
HUNAN HAILI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For wastewater with low content (COD=200-300ppm), it is acceptable to use activated carbon or resin for adsorption, but it is not feasible to use adsorption for high-content wastewater containing phenol; Phenol is basically non-biochemical; the color of water after oxidation of phenol to quinone is difficult to remove, further oxidation requires a large amount of oxidant and the cost is too high; we have used complex extraction to treat the wastewater, the effect is acceptable, but the process is complicated and costly Higher (see complex extraction method to treat phenol-containing wastewater fine chemical intermediates 46(3)52-56)

Method used

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  • Pretreatment method for wastewater produced in o-isopropoxyphenol production process

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Embodiment 1

[0037] A kind of pretreatment method of ortho-propoxyphenol production waste water of the present invention (get the ortho-propoxyphenol production waste water (being called for short OP waste water) 600ml of a pesticide factory in Changde), such as figure 1 shown, including the following steps:

[0038](1) Acidic flocculation: add 10g of hydrochloric acid to adjust the pH to 5, stir at room temperature for 10 minutes, add 6g of wet plant ash and 4.8g of polysilicate iron copper sulfate composition to make the pH of the solution 3.5, continue to stir for 0.5 hours, filter, filter Cake 20.6g, go to solid waste incinerator for incineration;

[0039] (2) Neutralization and flocculation: 600 g of the filtrate obtained in step (1) is poured into a beaker, and 7.63 g of 30% sodium hydroxide is slowly added in 5 minutes to adjust the pH to 8.5, then add plant ash 6 g and stir for 30 minutes, filter to obtain Colorless liquid 595g, filter cake 12g, the main component of the filter ca...

Embodiment 2

[0055] A kind of pretreatment method of the ortho-propoxyphenol production wastewater of the present invention (get the ortho-propoxyphenol production wastewater (600ml for short OP wastewater) of a pesticide factory in Zhuzhou), such as figure 1 shown, including the following steps:

[0056] (1) Acidic flocculation: add 5g of hydrochloric acid to adjust the pH to 6.5, stir at room temperature for 10 minutes, add 9g of wet plant ash, 6g of polysilicate iron copper sulfate composition, make the solution pH 5.5, continue to stir for 0.5 hours, filter, filter cake 32.4g, go to the solid waste incinerator for incineration;

[0057] (2) Neutralization and flocculation: the filtrate filtrate 587g of step (1) gained is poured into a beaker, slowly adds 30% sodium hydroxide 5.38g in 5 minutes, adjusts pH to be 7, adds plant ash 9g and stirs 30 minutes and filters, obtains Colored liquid 581g, filter cake 18g, the main component of the filter cake that this step filters out is plant a...

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Abstract

The invention discloses a pretreatment method for wastewater produced in an o-isopropoxyphenol (OP) production process. The pretreatment method comprises the following steps: a polyferric silicate sulfate copper composition and a first auxiliary filter agent are added into the wastewater produced in the o-isopropoxyphenol production process, then pH is adjusted to 3.5-5.5, stirring is performed, filtration is performed, and therefore wastewater of which phenol is removed is obtained. The pretreatment method has a good removing effect on phenolic compounds, small investment, low operating costs, and is convenient for engineering promotion and application.

Description

technical field [0001] The invention belongs to the technical field of pesticide wastewater pretreatment, and in particular relates to a method for pretreatment of wastewater generated in the production process of o-propoxyphenol. Background technique [0002] Ortho-propoxyphenol, commonly known as OP, is an important intermediate of the insecticide propoxur. The wastewater generated during the production of OP has a large volume, dark color, high COD, pungent smell, and poor biochemical properties. It has always been a difficult problem in wastewater treatment. Its main characteristics are as follows: [0003] Table 1 Composition of o-isopropoxyphenol production wastewater [0004] [0005] Compound 1: Compound 2: [0006] At present, there are mainly oxidation methods, extraction methods (solvent extraction or complex extraction), biochemical methods, and adsorption methods (activated carbon or resin adsorption, etc.) for the removal of phenolic wastewater. For w...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F101/34
CPCC02F1/001C02F1/5236C02F1/66C02F2101/345
Inventor 陈灿邱德跃张燕秦岳军马林干兴利刘欢钟若楠
Owner HUNAN HAILI CHEM IND
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