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Method of treating phenol-containing effluent and recovering resource in 2-methyl-4-chlorophenoxyacetic acid producing process

A chlorophenoxyacetic acid and resource recovery technology, applied in the direction of adsorption water/sewage treatment, etc., can solve the problems of undiscovered phenol-containing wastewater treatment and resource recovery and utilization, etc.

Inactive Publication Date: 2004-11-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Before the completion of the present invention, the existing domestic and foreign literature in the last twenty years was searched, and no report was found about the treatment and resource recovery of phenolic wastewater in the production process of 2-methyl-4-chlorophenoxyacetic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 10 mL (about 7.5 grams) of NDA-99 ultra-highly cross-linked macroporous adsorption resin into a jacketed glass adsorption column (φ12×160mm). At room temperature (20-25°C), the light yellow strongly acidic phenol-containing wastewater (pH=0.86) discharged from the production process of 2-methyl-4-chlorophenoxyacetic acid is filtered and passed through the resin bed at a flow rate of 40mL / h Layer, the wastewater treatment capacity is 220mL / batch. The phenol content of the raw wastewater is 2333mg / L, the adsorbed water is colorless and transparent, the phenol content is 2.88mg / L, and the phenol removal rate is >99%.

[0019] Use 20mL 2mol / L NaOH aqueous solution, 10mL 1mol / L NaOH aqueous solution and 20mL tap water to pass through the resin bed at a temperature of 60±5°C at a flow rate of 15mL / h for desorption, and the phenol desorption rate is >99%. The 10mL desorption liquid that just flowed out was brownish red, which was a high-concentration desorption liquid wit...

Embodiment 2

[0021] Put 100mL (about 75g) of NDA-99 resin into a jacketed glass adsorption column (φ32×360mm). At room temperature (25-30°C), the light yellow strongly acidic phenol-containing wastewater (pH=1.02) discharged from the production process of 2-methyl-4-chlorophenoxyacetic acid is filtered and passed through the resin bed at a flow rate of 350mL / h Layer, the wastewater treatment capacity is 2250mL / batch. The phenol content of the raw wastewater is 2387 mg / L, the adsorbed water is colorless and transparent, the phenol content is 3.23 mg / L, and the phenol removal rate is >99%.

[0022] Use 200mL 2mol / L NaOH aqueous solution, 100mL 1mol / L NaOH aqueous solution and 200mL tap water at a temperature of 60±5°C to pass through the resin bed at a flow rate of 100mL / h for desorption, and the phenol desorption rate is >99%. The 100mL desorption liquid that just started to flow out was brownish red, which was a high-concentration desorption liquid with a phenol content of 42358 mg / L. Us...

Embodiment 3

[0024] A) Adsorption process

[0025] Choose 3 adsorption towers with the same specification (φ600×3500mm), and fill each tower with 600 kg (about 800L) of NDA-99 resin. At room temperature (25-30°C), the light yellow strongly acidic phenol-containing wastewater (phenol content 2431mg / L) discharged from the production process of 2-methyl-4-chlorophenoxyacetic acid is pumped into the Adsorption tower, the adsorption adopts the method of I and II towers in series and downstream adsorption, and the adsorption flow rate is 3.2m 3 / h, the processing volume of each batch is controlled at 20m 3 . After the wastewater is treated, the phenol content in the effluent drops to 3.16mg / L, which can reach the discharge standard after biochemical treatment.

[0026] B) Desorption regeneration

[0027] The adsorbed first column I tower is desorbed with NaOH aqueous solution. The specific operation steps are as follows: first drain the residual liquid in tower I, and inject hot water count...

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PUM

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Abstract

The present invention is the method of treating phenol-containing effluent and recovering resource in 2-methyl-4-chlorophenoxyacetic acid (MCPA) as one farm herbicide. The steps includes: filtering of the effluent, macroporous resin adsorption in adsorbing tower and biochemical treatment of the adsorbed water before discharge; desorbing regeneration of adsorbed macroporous resin with orthocresol as desorption agent; and pH regulation and separation of the desorption agent liquid to obtain orthocresol, which is returned to production, water phase, which is returned to waste water treatment, and low concentration desorption liquid, which is reused. The said process can result in phenol concentration in the effluent below 5 mg / L, phenol eliminating rate higher than 99% and phenol recovering rate greater than 80%.

Description

1. Technical field [0001] The present invention relates to a method for the treatment and resource recovery of phenol-containing wastewater in the production process of pesticide herbicides, specifically, the production process of herbicide 2-methyl-4-chlorophenoxyacetic acid (abbreviated as 2-methyl-4-chlorophenoxyacetic acid or MCPA). Treatment and resource recovery methods of phenol-containing wastewater produced in 2. Background technology [0002] 2-Methyl-4-chlorophenoxyacetic acid is a post-emergence hormonal selective herbicide. At present, the traditional synthesis route of o-cresol as raw material through condensation, acidification and chlorination is mainly used in China to produce about 15 tons of strong acid waste water for the production of 2-methyl-4-chlorophenoxyacetic acid, COD cr As high as 20000-30000mg / L, of which the phenol content is 1500-3000mg / L, and also contains about 10% sodium chloride. [0003] Before the completion of the present invention, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28
Inventor 张全兴李洁莹邱宇平陆朝阳潘丙才叶必华苏庆朱兆连金小元陈金龙
Owner NANJING UNIV
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