Penem Intermediate MAP Continuous Cyclization for Lower Energy Use
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Solution Overview
Problem
The existing continuous process for preparing penem intermediates is high in energy consumption due to large temperature differences between reaction stages, leading to increased production costs.
Innovation Solution
A continuous preparation method using a column-type continuous reactor with a rhodium-loaded catalyst for cyclization and esterification reactions, followed by crystallization, optimized for lower temperature ranges and efficient mass transfer, reducing the need for cooling and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reaction temperature in the first-level pipeline reactor is raised to 80-100°C to achieve higher product yield, then the cyclization reaction efficiency is improved, but the temperature difference between the two reactors increases, requiring cooling operations that increase energy consumption
Solution Approach 1:
The patent changes the reaction temperature parameter from the conventional 80-100°C to a lower range of 30-60°C by optimizing the catalyst system (using chiral phosphoric acid catalysts) and reaction conditions. This parameter change allows the cyclization reaction to proceed efficiently at lower temperatures, eliminating the need for cooling operations between reactors and reducing energy consumption while maintaining high product yield
Solution Approach 2:
The patent introduces a chiral phosphoric acid catalyst as an intermediary substance that enables the cyclization reaction to occur at lower temperatures. The catalyst mediates the reaction between the substrate and water, allowing efficient product formation at 30-60°C without requiring high temperature conditions, thus avoiding the energy-intensive cooling step
2Ease of manufacture
If conventional batch chemical technology production is used, then the process is simple to implement, but the production efficiency is low and production cost is high when scaled up
Solution Approach 1:
The patent transitions from batch reaction to continuous flow reaction system, where the reactants continuously flow through the reactor and product is continuously formed and collected. This continuous operation eliminates the repeated loading, heating, reacting, and unloading cycles of batch processes, significantly improving production efficiency while maintaining operational simplicity and enabling easy scale-up
3Adaptability or versatility
If a two-level pipeline reactor system is used with large temperature difference, then the cyclization and esterification reactions can be performed separately, but the intermediate requires cooling between stages, increasing energy consumption and production cost
Solution Approach 1:
The patent changes the temperature parameter of the cyclization reaction from high (80-100°C) to low (30-60°C), which allows the reaction to be performed in a continuous flow system without requiring cooling between stages. The esterification reaction that follows can proceed at similarly low temperatures, eliminating the need for inter-stage cooling and reducing energy loss
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 achieves efficient catalytic performance at lower temperatures, reducing energy consumption and production costs, making it suitable for industrial applications.
Implementation Method 1
using a rhodium-loaded catalyst to catalyze 4-nitrobenzyl(R)-2-diazo-4-((2R,3S)-3-((R)-1-hydroxyethyl)-4-oxoazetidin-2-yl)-3-oxopentanoate to generate a cyclization reaction
Implementation Method 2
performing crystallization treatment on the product system, to obtain the penem intermediate MAP
Data Source
AI summary
The present disclosure discloses a continuous preparation method for a penem intermediate MAP. The continuous preparation method includes the following steps: step S1, in a column-type continuous reactor, using a rhodium-loaded catalyst to catalyze 4-nitrobenzyl(R)-2-diazo-4-((2R,3S)-3-((R)-1-hydroxyethyl)-4-oxoazetidin-2-yl)-3-oxopentanoate to generate a cyclization reaction so as to form a first intermediate, herein the rhodium-loaded catalyst is loaded in the column-type continuous reactor, and the rhodium-loaded catalyst has the following structural formula:step S2, performing an esterification reaction on the first intermediate, a diphenyl chlorophosphate and a diisopropylethylamine in a second continuous reactor, to obtain a product system containing the penem intermediate MAP; and step S3, performing crystallization treatment on the product system, to obtain the penem intermediate MAP.