A new process for the green synthesis of thiodicarb
By using sulfur chloride and excess pyridine as raw materials and solvents, eliminating water washing, and employing methanol washing and pyridine recovery technology, the problems of large wastewater volume and high cost in the synthesis of thiodicarb are solved, achieving efficient, low-cost, and green synthesis with product quality superior to traditional methods.
CN116874401BActive Publication Date: 2026-01-27SHANDONG FIRST MEDICAL UNIV & SHANDONG ACADEMY OF MEDICAL SCI
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Patent Information
- Application Number
- CN202310798697.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-30
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2043-06-30
AI Technical Summary
Technical Problem
The existing thiodicarb synthesis process generates a large amount of wastewater, is costly, and produces unstable product quality, posing a potential environmental pollution hazard.
Method used
Using sulfur chloride instead of sulfur dichloride as raw material, and using excess pyridine as solvent and catalyst, the water washing process is eliminated, and methanol washing and alcohol washing processes are adopted. Combined with pyridine recovery technology, the process flow is simplified.
Benefits of technology
It significantly reduces wastewater generation, lowers production costs, improves product purity and stability, and produces products with uniform particle size and color, meeting national standards.
✦ Generated by Eureka AI based on patent content.
Abstract
The application discloses a novel green synthesis process of thiodicarb, which uses chlorinated sulfur, methomyl and pyridine as raw materials to prepare thiodicarb, replaces sulfur dichloride in the traditional process with low-cost chlorinated sulfur, reduces the cost of raw materials, uses pyridine as alkalizing agent and solvent, dissolves methomyl in pyridine, makes the reactants in the liquid phase system, is beneficial to mass transfer, heat transfer and improves the reaction effect, removes the water washing process, uses methanol as a washing agent to wash the product, and avoids the problem of large amount of waste water in the conventional process. Under the process operation condition, the conversion rate of methomyl reaches 98.5%, the yield of thiodicarb reaches more than 92.1%, and no waste water is generated in the main process. The prepared thiodicarb is white powder, the colors of products of each batch are consistent, the content is greater than 97.6%, the thermal decomposition rate is less than 2.4%, and the appearance, content and thermal storage stability of the product meet the product standards.
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