Continuous Imidodisulfuryl Preparation via Segmented Flow
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Solution Overview
Problem
Current methods for preparing imidodisulfuryl compounds require long reaction times, high costs due to phosphorus chemistry, and pose safety risks due to exothermic decomposition at elevated temperatures, limiting scalability and purity.
Innovation Solution
A continuous reaction method at elevated temperatures above the decomposition onset of imidodisulfurylhalides, using a halosulfonyl isocyanate with a halosulfonic acid in a three-step process involving heating, cooling, and back pressure regulation, avoiding decomposition and enabling high yields and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If batch reaction at temperatures below decomposition onset is used, then safety is improved, but reaction time increases and productivity decreases
Solution Approach 1:
The batch reaction process is segmented into continuous flow stages with separate temperature control zones. The reaction is divided into mixing zone, heating zone, and cooling zone, allowing each segment to be optimized independently for both safety and efficiency.
Solution Approach 2:
The system transitions from static batch temperature control to dynamic continuous flow temperature control. Temperature profiles are dynamically adjusted along the flow path, enabling the reaction mixture to pass through elevated temperature zones quickly while maintaining overall safety through continuous monitoring and control.
2Productivity
If batch reaction at elevated temperatures above decomposition onset is used, then reaction time is reduced and productivity is improved, but safety risk increases due to exothermic decomposition
Solution Approach 1:
The reaction mixture is pre-cooled and reagents are pre-mixed before entering the heating zone. This preliminary preparation ensures that when the mixture reaches elevated temperatures, the reaction proceeds rapidly and controllably without excessive heat buildup that could trigger decomposition.
Solution Approach 2:
The continuous flow system allows the reaction mixture to rapidly pass through the elevated temperature zone above decomposition onset, minimizing the time spent at dangerous temperatures. The mixture is quickly heated through the reaction zone and then immediately cooled, effectively 'skipping' the dangerous temperature plateau that would occur in batch processing.
3Ease of manufacture
If phosphorus chemistry is used for preparation, then reaction pathway is available, but cost increases and environmental impact worsens
Solution Approach 1:
The invention replaces expensive and environmentally problematic phosphorus-based reagents with cheaper, greener alternatives. The new methodology uses readily available reagents that do not require phosphorus chemistry, eliminating the associated costs and environmental concerns while maintaining effective reaction pathways.
4Reliability
If long reaction times are used in batch process, then safety is maintained, but productivity decreases and equipment utilization is reduced
Solution Approach 1:
The invention transitions from discontinuous batch processing to continuous flow processing. The reaction operates continuously without the start-stop nature of batch cycles, maintaining productive action throughout. This continuous operation significantly improves equipment utilization while safety is maintained through inherent flow-based control mechanisms.
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
This method allows for safe, high-yield production of imidodisulfurylhalides with short reaction times and high purity, enabling large-scale production without phosphorus chemistry and ensuring safe handling.
Implementation Method 1
in device (DevS1) the mixture of compound of formula (II) and compound of formula (III) is heated to a temperature (TempS1), temperature (TempS1) is of from 180 to 300° C., where the reaction (ReacS1) takes place
Implementation Method 2
the reaction mixture is cooled to a temperature (TempS2) by the effects on the reaction mixture of device (DevS2) or of device (DevS3) or of a combination of device (DevS2) and device (DevS3), temperature (TempS2) is of from 0 to 150° C.
Data Source
AI summary
The invention relates to a method for the preparation of imidodisulfuryl compounds in a continuous reaction at elevated temperatures.