Treating method for waste liquid produced in production of 2,4-dichlorophenoxyacetic acid

A technology of dichlorophenoxyacetic acid and its treatment method, which is applied in the field of production waste liquid treatment, and can solve problems such as not conforming to the general direction of environmental protection and green production, difficult to recycle and reuse, and high treatment costs

Inactive Publication Date: 2018-09-07
SHANDONG RUNBO BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Because of this, 2,4-dichlorophenoxyacetic acid has a large market demand, but the high-salt wastewater generated during its preparation process has been difficult to recycle and reuse due to the presence of organic matter and industrial salt, and it is difficult to meet the increasingly stringent requirements. Emission standards are not in line with the general direction of today's environmental protection and green production
In the prior art, although the high-salt wastewater of 2,4-dichlorophenoxyacetic acid is recycled and treated, there are defects such as high energy consumption and incomplete treatment, which also lead to high treatment costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Take 1L of 2,4-D production wastewater, detect that the phenol content in it is 2200mg / L, and the sodium chloride content is 65g / L. After 1.5 hours of total reflux, open the reflux ratio controller, set the reflux ratio to 2:1 for sampling, the temperature of the tower bottom is 105-120°C, the temperature of the tower top is 98-100°C, and a total of 400ml is sampled. Detect the phenol content in the bottom wastewater to be 0.2mg / L;

[0095] Get 500ml of waste water at the bottom of the kettle, add it to the membrane treatment experimental device, and detect that the sodium chloride content in the waste water after membrane treatment is 130g / L. Among them, the material of the nanofiltration membrane is cellulose acetate, and the effective membrane area is 7m 2 , with a pore size of 1nm and a water yield of 7m 3 / d, the reflux ratio is 2:1; the reverse osmosis membrane is made of polyamide, and the effective membrane area is 7m 2 , the pore size is 0.2nm, and the water...

Embodiment 2

[0099] Take 1L of 2,4-D production wastewater, detect that the phenol content is 2400mg / L, and the sodium chloride content is 67g / L, add the wastewater to the rectification tower kettle, add 150ml xylene as the extraction agent to the rectification tower kettle, use Atmospheric distillation, after 1 hour of total reflux, open the reflux ratio controller, set the reflux ratio to 3:1 for sampling, the temperature at the bottom of the tower is 105-120°C, the temperature at the top of the tower is 98-100°C, and a total of 300ml is sampled. Detect the phenol content in the bottom wastewater to be 0.1mg / L;

[0100] Get 500ml of waste water at the bottom of the kettle, add it to the membrane treatment experimental device, and detect that the sodium chloride content in the waste water after membrane treatment is 125g / L. Among them, the nanofiltration membrane is made of sulfonated polyethersulfone, and the effective membrane area is 10m 2 , the pore size is 1.5nm, and the water yield...

Embodiment 3

[0104] Take 1L of 2,4-D production wastewater, detect that the phenol content in it is 2100mg / L, and the sodium chloride content is 70g / L. After 2 hours of total reflux, open the reflux ratio controller, set the reflux ratio to 1:1 for sampling, the temperature of the tower bottom is 105-120°C, the temperature of the tower top is 98-100°C, and a total of 280ml is sampled. The content of phenol in the bottom wastewater was detected to be 0.3mg / L;

[0105] Take 500ml of waste water at the bottom of the kettle, add it to the membrane treatment experimental device, and detect that the sodium chloride content in the waste water after membrane treatment is 140g / L. Among them, the nanofiltration membrane is made of polyamide, and the effective membrane area is 15m 2 , the pore size is 2nm, and the water production rate is 14m 3 / d, the reflux ratio is 3:1; the material of the reverse osmosis membrane is polyvinyl alcohol, and the effective membrane area is 20m 2 , the pore size is...

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Abstract

The invention provides a treating method for waste liquid produced in production of 2,4-dichlorophenoxyacetic acid. The treating method comprises the following steps: subjecting the waste liquid produced in production of 2,4-dichlorophenoxyacetic acid and an extractant to rectification so as to obtain preliminarily-treated waste liquid and phenolic substances; subjecting the preliminarily-treatedwaste liquid obtained in the previous step to membrane filtration so as to obtain a concentrate; and carrying out evaporation treatment on the concentrate obtained in the previous step so as to obtainan industrial salt. According to the invention, main organic matters, i.e., the phenolic substances, in the waste liquid produced in production of 2,4-dichlorophenoxyacetic acid are recovered in virtue of extraction and rectification technology based on the content and composition of waste in the waste liquid; membrane technology is employed for further removing organic matters in the waste waterand reducing cost for subsequent dehydration of the waste water; and evaporation treatment is carried out, so concentration waste liquid and dangerous waste are not produced, treatment cost is not needed, and the industrial salt with high purity can be obtained and can be industrially applied to chlor-alkali, soda ash, snow-melting agents, etc.

Description

technical field [0001] The invention belongs to the technical field of preparation of 2,4-dichlorophenoxyacetic acid, and in particular relates to a method for treating production waste liquid of 2,4-dichlorophenoxyacetic acid. Background technique [0002] 2,4-dichlorophenoxyacetic acid, also known as 2,4-D, (2,4-dichlorophenoxy)acetic acid or 2,4-D acid, etc., the molecular formula is C 8 h 6 Cl 2 o 3 , with a melting point of 140.5°C and a boiling point of 160°C, a white rhomboid crystal, soluble in most organic solvents such as alcohol, ether or ketone, and almost insoluble in water. [0003] 2,4-Dichlorophenoxyacetic acid compounds are a very important class of compounds. They are the longest-used organic synthetic herbicides in the world and are still widely used. They are mainly used as herbicides in agriculture Or the use of plant growth agents, in the field of analysis, for the determination of carbon and hydrogen standards for organic trace analysis. [0004] ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C02F9/10C07C37/70C07C39/30C01D3/04C02F101/12C02F101/34C02F103/36
CPCC02F9/00C01D3/04C01P2006/80C02F1/04C02F1/048C02F1/26C02F1/441C02F1/442C02F2101/12C02F2101/345C02F2103/36C07C37/009C07C39/30
Inventor孙国庆侯永生凌晓光赵广理陈桂元
OwnerSHANDONG RUNBO BIOTECH CO LTD