Continuous Flow Synthesis of 2-Methyl-4-Amino-5-Aminomethylpyrimidine
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Solution Overview
Problem
Traditional batch reactor methods for synthesizing 2-methyl-4-amino-5-aminomethylpyrimidine are time-consuming, energy-intensive, and pose safety risks with low efficiency and yield, making them unsuitable for industrial application.
Innovation Solution
A full continuous flow preparation method using a micro-reaction system comprising a micro-mixer, microchannel reactor, continuous distillation, oscillating reactor, filtration, and quenching-extraction-separation equipment, which includes steps of mixing cyanoacetamide with catalysts, inorganic bases, and solvents for continuous reaction and purification, significantly reducing reaction time and energy consumption while enhancing safety and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional batch reactor method is used for synthesis, then the process is simple to operate, but the reaction time is long and energy consumption is high
Solution Approach 1:
The patent replaces the traditional batch mechanical stirring system with a continuous flow microchannel reaction system. The microchannel reactor uses fluid dynamics and pressure-driven flow instead of mechanical stirring, eliminating the need for complex stirring mechanisms while achieving superior mixing and heat transfer. This substitution dramatically reduces reaction time from hours to minutes while maintaining operational simplicity through automated continuous flow control.
Solution Approach 2:
The patent implements continuous flow synthesis where reactants continuously flow through the microchannel reactor, allowing the reaction to proceed without interruption. This continuous action eliminates the idle time associated with batch processing (loading, unloading, heating up, cooling down) and maintains optimal reaction conditions throughout the process, significantly reducing total reaction time while improving energy efficiency.
2Device complexity
If traditional batch reactor method is used, then the equipment is simple, but energy consumption is high and safety risk is large
Solution Approach 1:
The patent changes the operating parameters by conducting reactions in a continuous flow regime rather than batch mode. The microchannel reactor operates at controlled flow rates, temperatures, and pressures that optimize reaction efficiency. The small channel dimensions enable precise temperature control and rapid heat exchange, reducing energy consumption while improving safety through better control of exothermic reactions.
Solution Approach 2:
The patent transitions from three-dimensional batch mixing to two-dimensional planar flow in microchannels. This dimensional change provides superior surface-to-volume ratio for heat and mass transfer, enabling more efficient energy utilization and better thermal management, which reduces overall energy consumption and enhances safety by preventing hot spots and runaway reactions.
3Ease of manufacture
If traditional batch reactor method is used, then the process is established, but product yield is low and conversion rate is poor
Solution Approach 1:
The patent creates locally optimized reaction conditions within the microchannel reactor. The continuous flow ensures uniform distribution of reactants and catalysts, creating consistent local environments throughout the reactor. This local quality control eliminates the heterogeneity inherent in batch processes, leading to more complete conversions and higher yields while maintaining process reliability.
Solution Approach 2:
The patent introduces a continuous flow system as an intermediary between reactant feeding and product collection. This intermediary system maintains optimal reaction conditions throughout the process, including controlled residence time, uniform mixing, and stable temperature, which significantly improves conversion rates and product yield compared to traditional batch methods.
4Reliability
If catalytic hydrogenation is performed under high pressure, then the reaction can proceed, but safety risk increases and energy consumption rises
Solution Approach 1:
The patent changes the pressure parameter by conducting hydrogenation reactions at atmospheric or near-atmospheric pressure instead of high pressure. The microchannel reactor's enhanced mass transfer and catalytic efficiency compensate for the reduced pressure, maintaining reaction feasibility while dramatically improving safety by eliminating the need for high-pressure equipment and reducing energy consumption for compression.
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 shortens reaction time, increases product yield from 60% to 90%, improves purity from 95% to 98%, and reduces energy consumption, making it more efficient and safer for industrial production.
Implementation Method 1
allowing the reaction mixture in the first micro-mixer to flow into the microchannel reactor followed by continuous flow reaction
Implementation Method 2
The microchannel reactor has a first part and a second part; a reaction temperature of the first part is -20-80°C, and a reaction temperature of the second part is -20-80°C
Implementation Method 3
feeding the reaction mixture in the second micro-mixer to the continuous oscillating reactor for condensation and cyclization
Implementation Method 4
feeding the reaction mixture in the second micro-mixer to the continuous oscillating reactor for condensation and cyclization
Implementation Method 5
transporting the (dimethylaminomethylene) malononitrile organic solution in the first liquid storage buffer tank and hydrogen gas to the third micro-mixer for mixing, and then allowing the reaction mixture in the third micro-mixer to enter the fixed-bed reactor for continuous catalytic hydrogenation, wherein the fixed-bed reactor is filled with a Raney nickel catalyst
Implementation Method 6
feeding the reaction mixture flowing out of the microchannel reactor, an aqueous solution of an inorganic base and a first organic solvent into the continuous quenching-extraction-separation unit simultaneously for continuous quenching, extraction and separation to collect an organic phase
Implementation Method 7
feeding the reaction mixture flowing out of the continuous oscillating reactor to the continuous filtration unit for continuous filtration to collect a filter cake
Implementation Method 8
subjecting the organic phase to continuous concentration to obtain an oily product
Implementation Method 9
continuous distillation and concentration
Data Source
AI summary
A full continuous flow preparation method of 2-methyl-4-amino-5-aminomethylpyrimidine. A mixed solution of cyanoacetamide, N,N-dimethylformamide and a catalyst is mixed with phosphorus oxychloride in a first micro-mixer, and then the reaction mixture undergoes continuous flow reaction in a microchannel reactor to obtain (dimethylaminomethylene) malononitrile. The reaction mixture is subjected to continuous quenching, extraction and separation, and the organic phase is concentrated, mixed with a methanol solution, and then reacted with an organic base to obtain 2-methyl-4-amino-5-cyanopyrimidine. After the mixed liquid is continuously filtered, the filter cake is dissolved in methanol, mixed with hydrogen in a second micro-mixer, and then transported to a fixed-bed reactor for hydrogenation reaction. The products are concentrated, dried and purified to obtain the desired 2-methyl-4-amino-5-aminomethylpyrimidine.