Recovery system of dichloroethane in thiophanate-methyl production
By using a negative pressure distillation vessel and stirring unit in the production of thiophanate-methyl, combined with a demulsifier, the problem of azeotropic reaction between dichloroethane and water was solved, achieving efficient recovery and reduced energy consumption, thus improving the quality and production efficiency of dichloroethane.
Patent Information
- Application Number
- CN202521926431.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-08
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-08
AI Technical Summary
In the existing technology, during the dichloroethane recovery process in the production of methyl thiophanate, atmospheric distillation causes dichloroethane to azeotropically react with water, which increases energy consumption and easily triggers side reactions. Furthermore, the distillation of the water azeotrope wastes steam.
A distillation vessel using a negative pressure pump to provide a vacuum environment, combined with a stirring unit and a demulsifier, reduces the pressure inside the distillation vessel by negative pressure, widens the boiling point difference between dichloroethane and water, reduces the formation of azeotropes, and improves separation efficiency by using a stirring tube and a demulsifier.
This technology enables efficient recovery of dichloroethane, reduces water content and energy consumption, avoids the decomposition of methyl thiophanate due to excessively high temperatures, and improves product quality and production efficiency.