Micro Reaction System for Continuous 2-Methyl-4-Amino-5-Cyanopyrimidine Synthesis
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Solution Overview
Problem
Existing methods for preparing 2-methyl-4-amino-5-cyanopyrimidine are limited by low yield, long synthesis routes, high costs, and energy consumption, making them unsuitable for industrial application.
Innovation Solution
A micro reaction system comprising a micromixer and an agitating microchannel reactor is used to facilitate a continuous condensation-cyclization reaction between acetamidine hydrochloride and (dimethylaminomethylene)malononitrile, optimizing reaction conditions such as temperature, flow rates, and mixing to enhance yield and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional batch reaction methods are used with multiple synthesis steps, then the synthesis route is established, but the yield is low and the process is complex
Solution Approach 1:
The traditional multi-step batch synthesis process is segmented into discrete micro-reaction modules including a micromixer for rapid mixing of reactants, followed by sequential micro-reactors for each transformation step. This modular segmentation allows independent optimization of each step, improving overall yield while maintaining manageable process complexity through standardized module replication.
Solution Approach 2:
The patent implements continuous flow synthesis where reactants flow continuously through the micro-reaction system rather than batch processing. This continuity eliminates idle time between steps, maintains optimal reaction conditions throughout, and enables steady-state operation that improves yield consistency while reducing the complexity of process control compared to repeated batch cycles.
2Productivity
If traditional synthesis methods with long reaction times are used, then complete reaction is achieved, but productivity is low and energy consumption is high
Solution Approach 1:
The micro-reaction system employs dynamic control of flow rates, temperature, and residence times to optimize reaction efficiency. By dynamically adjusting these parameters through automated flow control, the system achieves complete conversion in shorter times without excessive energy input, as each parameter can be precisely tuned to the specific reaction requirements rather than using fixed batch conditions.
Solution Approach 2:
The patent utilizes parameter changes including temperature gradients along the micro-reactor, variable flow rates, and pressure control to enhance reaction kinetics. These parameter variations enable faster reaction rates and improved productivity while the precise control minimizes energy consumption by avoiding unnecessary heating or prolonged reaction times.
3Loss of time
If conventional mixing and reaction methods are used, then adequate mixing is achieved, but mixing efficiency is low and reaction time is long
Solution Approach 1:
The micromixer design transitions from conventional bulk mixing to micro-scale three-dimensional flow patterns. Reactants are introduced at different locations and heights within the micro-channel, creating complex flow trajectories that enhance mixing efficiency. This dimensional approach to mixing in the micro-scale reduces reaction time significantly compared to traditional two-dimensional surface mixing or bulk stirring methods.
Solution Approach 2:
The system employs hydraulic flow dynamics within the micro-channels to achieve rapid and homogeneous mixing. By controlling fluid pressure and flow rates through the narrow channels, the system generates controlled turbulence and flow patterns that enhance mixing efficiency without mechanical agitation, reducing reaction time while maintaining ease of operation through pump control.
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 method significantly reduces reaction time, increases yield to over 90%, simplifies operations, and lowers energy consumption, making the process more industrially viable with high automation and reduced costs.
Implementation Method 1
pumping an acetamidine hydrochloride solution and a (dimethylaminomethylene)malononitrile solution separately into the micromixer at the same time followed by mixing
Implementation Method 2
subjecting the reaction mixture to condensation-cyclization reaction
Implementation Method 3
subjecting the reaction mixture to condensation-cyclization reaction
Data Source
AI summary
Disclosed herein relates to pharmaceutical engineering, and more particularly to a micro reaction system and a method for preparing 2-methyl-4-amino-5-cyanopyrimidine using the same. An acetamidine hydrochloride solution and an (dimethylaminomethylene)malononitrile solution are separately pumped into the micro reaction system including a micromixer and an agitating microchannel reactor in communication at the same time for a continuous condensation-cyclization reaction to obtain 2-methyl-4-amino-5-cyanopyrimidine.