Countercurrent Crystallizer for High-Purity Pharmaceutical Agents
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Solution Overview
Problem
Conventional crystallization methods face limitations in achieving high-purity pharmaceutical agents due to complex equipment, low efficiency, and exponential yield losses with multiple stages, especially for temperature-sensitive substances, where phase transitions and solubility gradients are challenging, leading to inefficient and costly processes.
Innovation Solution
A compact, automated countercurrent crystallization technology that integrates dissolving, crystallizing, and phase-separating operations within a single heatable stirred reactor, utilizing parallel-operated stages with synchronized supersaturation control through alternating heating and evaporation phases under vacuum, allowing for efficient crystal growth and impurity depletion without external separation equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional crystallization methods are used to achieve high purity, then purification effectiveness is improved, but equipment complexity and process time increase exponentially
Solution Approach 1:
The patent combines multiple crystallization stages into a single integrated crystallizer unit, eliminating the need for separate crystallization chambers, filters, and handling equipment for each stage. This merging of functions reduces equipment complexity while maintaining the ability to achieve high purity through multi-stage crystallization.
Solution Approach 2:
The crystallizer is designed to perform multiple functions: crystallization, filtration, mother liquor handling, and crystal product collection all within a single unit. This multi-functionality eliminates the need for separate dedicated equipment for each operation, reducing overall system complexity.
2Manufacturing precision
If multiple crystallization stages are implemented to increase purification, then crystal purity is improved, but yield losses increase exponentially
Solution Approach 1:
The patent implements continuous crystallization and continuous filtration throughout the process, eliminating idle times and ensuring that material flows continuously through the system. This continuous operation prevents yield losses that would occur during loading, unloading, and cleaning operations between batch stages.
Solution Approach 2:
The system automatically handles mother liquor removal and crystal product transfer without manual intervention. The filtration system self-cleans and the crystal product is automatically collected and sealed, eliminating losses associated with manual handling and reducing the need for intermediate transfer steps.
3Manufacturing precision
If classical continuous process management in column-like arrangements is used, then fractionation effect is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The crystallizer is designed to automatically perform crystallization, filtration, and product transfer without requiring complex external equipment or manual intervention. The system self-regulates the crystallization process and automatically handles the separation of mother liquor from crystal product, simplifying operation while maintaining effective purification.
Solution Approach 2:
The patent extracts and eliminates the need for complex external equipment such as column-like structures, multiple separate crystallization chambers, and elaborate filtration systems. By integrating these functions into a single unit, the operation becomes simpler while the purification effect is maintained through the multi-stage crystallization process.
4Manufacturing precision
If external solid-liquid separation equipment is used for each crystallization stage, then separation efficiency is improved, but device complexity and automation difficulty increase
Solution Approach 1:
The patent combines the crystallization and filtration functions into a single integrated crystallizer unit. The internal filtration system is built into the crystallizer structure itself, eliminating the need for separate external filtration equipment and reducing overall system complexity.
Solution Approach 2:
The crystallizer is designed as a multi-functional unit that performs crystallization, filtration, mother liquor removal, and crystal product collection all within one device. This universal design eliminates the need for multiple separate pieces of equipment, reducing complexity while maintaining separation efficiency.
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 approach achieves high reproducibility and compliance in yield and purification effects, reducing manual effort and equipment complexity, enabling quasi-continuous operation with improved yield and purity, independent of temperature-dependent solubility, and preventing crystalline depositions.
Implementation Method 1
the same amount of solvent, proportional to the quantity used, continuously evaporates from all crystallizers in parallel operation under the same temperature and pressure conditions during the crystallization phase
Implementation Method 2
the continuous evaporation is performed under vacuum and the evaporation heat required for this process is withdrawn from the suspension volume that cools down correspondingly
Implementation Method 3
the evaporation heat is led to the suspension volume before the crystallization phase
Implementation Method 4
A compact, automated countercurrent crystallization technology that integrates dissolving, crystallizing, and phase-separating operations within a single heatable stirred reactor
Data Source
AI summary
An arrangement and a method for producing high-purity crystals, such as temperature-sensitive pharmaceutical agents, in a countercurrent crystallization process. The arrangement comprises a plurality of crystallizers, mother liquor lines, each of which has a shut-off valve, and crystallization product lines, each of which has a shut-off valve, so that a mother liquor flow can be generated which is directed from a crystallizer to the second-next crystallizer in the direction of decreasing purity, and a crystallization product flow can be generated which is directed from a to dissolved crystallization product that is about to crystallize to the next crystallizer in the direction of higher purity.