Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Methomyl process wastewater treatment method

A treatment method, the technology of methomyl, is applied in the field of methomyl process wastewater treatment, and can solve the problem of methomyl process wastewater treatment process that has not been seen, the difficulty in the treatment of high-concentration saline wastewater, and the treatment of methomyl waste liquid. Explosion of the device and other problems, to achieve the effect of facilitating subsequent processing, reducing processing difficulty and safety risks, and reducing COD concentration

Active Publication Date: 2021-06-25
湖南海利常德农药化工有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing methomyl preparation process, a large amount of process wastewater containing methomyl has been produced, yet, the treatment process about methomyl process wastewater has not been seen in the prior art
In addition, due to the poor thermal stability of methomyl, it is easy to cause the explosion of methomyl waste liquid treatment device, so domestic and foreign methomyl manufacturers directly give up the recovery of methomyl or use the salting out method to recover methomyl
But, when adopting the salting-out method to reclaim methomyl, there are still following problems: (1) the solubility of industrial salt in water is about 36g, promptly handles 10000 tons of methomyl waste water and needs to add about 3600 tons of industrial salt, increased Production cost and total amount of waste water; (2) the treatment of high-concentration saline waste water after reclaiming methomyl by salting-out method is difficult and costly

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A treatment method for methomyl process wastewater, comprising the following steps:

[0027] In a 2L three-neck flask, add 1000g of methomyl process wastewater and 200g of 1,2-dichloroethane, stir at 25°C for 0.5 hours, then transfer the material to a 2L pear-shaped separatory funnel, and stand still for 20 minutes. The lower organic extract and the upper aqueous phase were separated. Transfer the upper aqueous phase to a 2L three-necked flask, add 200g of 1,2-dichloroethane, repeat the above operation, and perform the second extraction, wherein the concentration of COD in the aqueous phase separated after extraction is greatly reduced, greatly reducing the processing time. Difficulty and security risks. Combine the two separated organic extracts, add them to a 1L three-necked flask, add 100g of tap water and 2g of activated carbon, heat in a water bath to 50°C, filter under reduced pressure to recover 1,2-dichloroethane, filter while hot, The obtained filtrate was cr...

Embodiment 2

[0029] A treatment method for methomyl process wastewater, comprising the following steps:

[0030]In a 2L three-necked flask, add 1000g of methomyl process wastewater and 200g of dichloromethane, stir at 5°C for 0.5 hours, then transfer the material to a 2L pear-shaped separatory funnel, and after standing still for 20 minutes, separate the lower organic extract liquid and the upper aqueous phase. Transfer the upper aqueous phase to a 2L three-necked flask, add 200g of dichloromethane, repeat the above operation, and perform the second extraction. The concentration of COD in the separated aqueous phase after extraction is greatly reduced, which greatly reduces the difficulty of handling and safety risks. Combine the two separated organic extracts, add them into a 1L three-necked flask, add 80g of tap water and 1g of activated carbon, heat in a water bath to 50°C, filter under reduced pressure to recover dichloromethane, filter while it is hot, and cool the filtrate to crystal...

Embodiment 3

[0032] A treatment method for methomyl process wastewater, comprising the following steps:

[0033] In a 2L three-necked flask, add 1000g of methomyl process wastewater and 200g of chloroform, stir at 30°C for 0.5 hours, then transfer the material to a 2L pear-shaped separatory funnel, and after standing still for 20 minutes, separate the lower organic extract liquid and the upper aqueous phase. Transfer the upper aqueous phase to a 2L three-necked flask, add 200g of chloroform, repeat the above operation, and perform the second extraction. The COD concentration in the separated aqueous phase after extraction is greatly reduced, which greatly reduces the difficulty of handling and safety risks. Combine the two separated organic extracts, add them into a 1L three-necked flask, add 50g of tap water and 0.5g of activated carbon, heat in a water bath to 50°C, filter under reduced pressure to recover chloroform, filter while it is hot, and cool the filtrate to crystallize. After f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a methomyl process wastewater treatment method, which comprises : mixing methomyl process wastewater with an organic solvent, extracting, separating, and collecting an organic extraction liquid; mixing the organic extract with water and activated carbon, recovering the organic solvent in the obtained mixed solution, and filtering to obtain filtrate; and crystallizing, filtering and drying the filtrate, and recovering methomyl to complete the treatment of methomyl process wastewater. The methomyl process wastewater treatment method has the advantages of being simple in process, convenient to operate, low in treatment cost, high in safety and the like, effective pretreatment of methomyl process wastewater can be achieved on the premise that the wastewater yield is not increased, the follow-up treatment difficulty of methomyl process wastewater is remarkably reduced, meanwhile, the method has the characteristics of high methomyl recovery rate, recyclability of the organic solvent and the like, the product yield is improved, a high-quality methomyl recovery product is obtained, the treatment cost is reduced, and the method is suitable for industrial popularization.

Description

technical field [0001] The invention relates to a treatment method for methomyl process wastewater. Background technique [0002] Methomyl is an oxime carbamate insecticide, acaricide, nematocide and molluscicide, developed by DuPont Company of the United States in 1966, with contact killing, stomach poisoning and ovicidal effects, and strong lethality , quick effect, wide insecticidal spectrum, low residue, wide range of crops, safe to use, widely used in cotton, cabbage, tobacco, citrus, soybeans, peanuts and more than 30 kinds of crops. Methomyl is a highly pesticide and will be banned soon, but it can still be used as an important intermediate for the synthesis of thiodimethomyl. Thiodicarb, English common name thiodicarb, also known as Lavein, is a second-generation carbamate insecticide, which is one of the low-toxicity derivatives further improved on the basis of methomyl , that is, two methomyl molecules are connected through a thioether chain to form a biscarbamat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C07C319/28C07C323/47C02F103/36C02F1/26C02F1/28C02F1/52C02F101/30
CPCC02F9/00C07C319/28C02F2103/36C02F1/26C02F1/283C02F1/52C02F2001/5218C02F1/001C02F2101/30C02F2209/08C07C323/47Y02A50/30
Inventor 罗先福虞孝云陈明彭军刘卫东臧阳陵尹霖王燕
Owner 湖南海利常德农药化工有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com