Phosphorothioate Purification via Acid Treatment
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Solution Overview
Problem
Conventional processes for producing O-(2,6-dichloro-4-methylphenyl)-O,O-dimethyl phosphorothioate result in crude products with high impurity levels, affecting the purity and stability of the final compound, particularly in terms of heat stability.
Innovation Solution
A process involving the use of an acid, preferably an inorganic acid, to purify crude O-(2,6-dichloro-4-methylphenyl)-O,O-dimethyl phosphorothioate, which includes contacting the crude product with an acid followed by recovery, often using an aromatic hydrocarbon solvent like toluene, to achieve a higher purity and improved heat stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional reaction method is used to produce phosphorothioate, then the production process is simple, but the product contains high impurity levels and has poor heat stability
Solution Approach 1:
The production process is divided into three distinct steps: (1) reaction step to produce crude phosphorothioate, (2) purification step using acid treatment, and (3) recovery step. This segmentation allows each step to be optimized independently, achieving high product purity while maintaining reasonable process complexity through modularization of the production流程
Solution Approach 2:
The purification step extracts and removes impurities from the crude phosphorothioate product through acid treatment. By selectively removing impurities in a separate step, the process achieves high product purity without requiring complete redesign of the entire production process, thus balancing purification effectiveness with process complexity
2Stability of the object's composition
If conventional reaction method is used, then the production process is straightforward, but the product shows significant conversion to S-methyl form after heating
Solution Approach 1:
The acid treatment step is performed as a preliminary action before the final recovery step. This preliminary purification removes impurities that would otherwise cause degradation during heating, thereby enhancing heat stability. The preliminary action prevents subsequent problems rather than addressing them after they occur
Solution Approach 2:
The acid treatment step, which adds complexity to the process, converts harmful impurities into beneficial removed substances. The acid treatment transforms the crude product with high impurity content into a purified product with enhanced heat stability, converting the potential harm of impurity-induced degradation into a benefit through selective removal
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process effectively reduces impurity levels and enhances the heat stability of the final product, with less than 5% conversion to S-methyl form even after heating at 60°C for extended periods, compared to conventional methods which show significant conversion.
Implementation Method 1
the first step of bringing a crude O-(2,6-dichloro-4-methylphenyl)-O,O-dimethyl phosphorothioate into contact with an acid
Implementation Method 2
reacting 2,6-dichloro-4-methylphenol and O,O-dimethyl chlorophosphorothioate in the presence of copper chloride in an alkali aqueous solution
Data Source
AI summary
A process for producing a purified O-(2,6-dichloro-4-methylphenyl)-O,O-dimethyl phosphorothioate, the process comprising:the first step of bringing a crude O-(2,6-dichloro-4-methylphenyl)-O,O-dimethyl phosphorothioate into contact with an acid; andthe second step of recovering the purified O-(2,6-dichloro-4-methylphenyl)-O,O-dimethyl phosphorothioate from the mixture obtained in the first step.