As a high-purity pesticide intermediate, the post-production treatment of acetochlor needs to solve the problems of inorganic salt residue, removal of unreacted raw materials, solvent recovery, etc. The traditional gravity separation method has the defects of low separation efficiency, easy emulsification, and long time consumption. The centrifugal extractor uses high-speed centrifugal force to achieve rapid mixing and separation of two-phase liquids with different densities and immiscible with each other, breaking through the bottleneck of traditional processes.
Improved mass transfer efficiency: The centrifugal extractor rotates the drum at high speed to make the acetochlor reaction liquid fully contact with the washing water, and the mass transfer efficiency is improved by 3-5 times.
Emulsification inhibition: The centrifugal force forced separation characteristics can avoid the retention of emulsions caused by changes in interfacial tension during acid/alkali washing, and reduce the loss of intermediates.
Continuous production: Supports multi-stage countercurrent washing (such as four-stage acid washing + three-stage water washing), and the processing capacity of a single device reaches 10-50m³/h, meeting the needs of large-scale production.
Application of Centrifugal Extractor in Post-treatment of Acetochlor
- Acid washing and alkali washing process: precise removal of impurities
Acid washing and impurity removal: Mix the reaction solution with dilute sulfuric acid, and use the centrifugal extractor to quickly separate and remove unreacted acidic impurities such as chloroacetyl chloride, with a pH control accuracy of ±0.2.
Alkaline washing and neutralization: Neutralize the residual acid solution with sodium hydroxide solution. After centrifugal separation, the purity of the organic phase of acetochlor can be increased to more than 98%, which is 15% higher than the traditional process. - Multi-stage water washing process: deep purification
Three-stage water washing: use deionized water to wash continuously for 3 times to remove inorganic salts and water-soluble impurities. The centrifuge single separation time is less than 2 minutes, and the water consumption is reduced by 40%.
Four-stage enhanced water washing (optional): For high-purity demand scenarios (such as medical-grade acetochlor), add a first-stage water washing to reduce the conductivity index to below 10μS/cm. - Solvent recovery and recycling
Solvent-water phase separation: After extraction, the mixed liquid is separated by a centrifuge, and the recovered organic solvent (such as toluene) has a purity of 99.5% and can be directly reused in the previous reaction process.
Energy saving and consumption reduction: A technical transformation case of a pesticide factory shows that the solvent recovery rate increased from 75% to 92% after the use of the centrifugal extractor, saving more than 2 million yuan in annual costs.
Operational Optimization and Future Technology Trends
- Control of key operating parameters
Speed regulation: Dynamically adjust the drum speed (usually 2000-4000rpm) according to the viscosity of the material to avoid blockage caused by high viscosity.
Temperature management: Maintain the washing liquid temperature at 30-40℃ to reduce the viscosity of the organic phase of acetochlor and improve separation efficiency. - Technology development direction
Intelligent control system: integrated pH and turbidity online monitoring modules to achieve adaptive adjustment of washing stages.
Green process integration: coupled with membrane separation technology, building a "centrifugal extraction-membrane concentration-solvent regeneration" closed-loop system to achieve zero wastewater discharge.
The centrifugal extractor has significantly improved product quality and production efficiency while reducing environmental impact by innovating the post-treatment process of acetochlor. With the deep integration of intelligent and green manufacturing technologies, it will show greater application potential in the field of pesticide intermediates.
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