Dynamic Pressurization Rate Limiting in Supercritical Chromatography
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Solution Overview
Problem
Current chromatographic techniques face challenges in controlling and stabilizing pressure in supercritical fluid chromatography systems, particularly in CO2-based systems, which affects the separation efficiency and throughput of chiral and achiral compounds, and requires improved methods for pressure management to enhance resolution and reduce cycle times.
Innovation Solution
Implementing a system with a column manager, pump, pressure regulator, and controller to measure and dynamically limit the rate of pressurization based on a relationship between the flow rate and closed system rate of pressurization, using a ratio to set a dynamic limit for each system configuration, allowing for stable pressure control and efficient solvent use across varying system volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the system volume is increased to improve separation efficiency, then the resolution is improved, but the rate of pressurization increases causing unstable pressure control
Solution Approach 1:
The patent applies dynamics by making the pressurization rate limit configurable based on system volume. The controller dynamically adjusts the maximum pressurization rate according to the detected column configuration, allowing the system to optimize between separation efficiency and pressure stability for each specific setup.
Solution Approach 2:
The patent changes the parameter of pressurization rate limit based on system volume. By detecting the column volume and calculating an appropriate pressurization rate limit, the system adapts the operating parameters to maintain stable pressure control while achieving desired separation efficiency.
2Productivity
If the pressurization rate is increased to reduce cycle time, then the productivity is improved, but the pressure stability deteriorates affecting separation quality
Solution Approach 1:
The system dynamically determines the maximum pressurization rate based on the specific column configuration and system volume. This dynamic adjustment allows the system to achieve optimal throughput for each configuration while maintaining pressure stability, rather than using a fixed conservative limit.
Solution Approach 2:
The controller detects the column configuration and system volume, then uses this feedback to calculate and set an appropriate pressurization rate limit. This feedback mechanism ensures that the pressurization rate is optimized for each specific system setup, balancing productivity and pressure stability.
3Reliability
If a fixed conservative pressurization rate limit is used to ensure pressure stability, then the reliability is improved, but the productivity decreases due to extended cycle times
Solution Approach 1:
Instead of using a fixed conservative pressurization rate limit, the system dynamically determines the appropriate limit based on the detected column configuration and system volume. This eliminates the need for overly conservative fixed limits while maintaining pressure stability through configuration-specific optimization.
Solution Approach 2:
The pressurization rate limit parameter is changed based on system volume and column configuration. By calculating the appropriate limit for each configuration, the system maintains reliability through stable pressure control while improving productivity by avoiding unnecessarily conservative limits.
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 provides improved control over pressure in pressurized flow systems, enhancing the separation efficiency and throughput of CO2-based chromatography by maintaining stable pressure and reducing solvent consumption, thereby increasing laboratory efficiency and integrating with other detection methods like Mass Spectrometry.
Implementation Method 1
pumping a solvent through the system at a flow rate and pressurizing the system to a set pressure
Implementation Method 2
controlling a rate of pressurization of the system
Data Source
AI summary
Exemplary embodiments of the present disclosure are directed to limiting a rate or pressurization in a reconfigurable pressurized flow system for which different system configurations can have different system volumes. In exemplary embodiments, the system can determine a limit for the rate of pressurization by configuring the system for a closed system rate of pressurization, measuring the closed system rate of pressurization at a set flow rate, and determining a relationship between the closed system rate of pressurization and the flow rate. The system can use the relationship to dynamically set the limit for different flow rates in the system.