High-pressure fluid chromatography system using interior-to-exterior column pressure equalization
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Solution Overview
Problem
Existing supercritical fluid systems face issues with Joule-Thomson cooling effects leading to undesired depressurization and plugging of restrictors, and traditional flash chromatography systems require high solvent use and cannot handle higher pressures with disposable plastic cartridges.
Innovation Solution
A cooling loop refrigeration circuit using compressed refrigerant fluid with a positive Joule-Thomson coefficient to absorb thermal energy from supercritical fluids, combined with a pressure equalizing vessel and cyclonic separators to manage high pressures and prevent plugging, while using a chiller to subcool liquefied gas or supercritical gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If Joule-Thomson cooling effect is utilized for refrigeration, then cooling efficiency is improved, but depressurization and restrictor plugging occur
Solution Approach 1:
The patent converts the harmful Joule-Thomson cooling effect at the restrictor tip into a beneficial refrigeration mechanism by deliberately designing a cooling loop where the expansion device is integrated into the refrigeration circuit. The cold refrigerant fluid, generated by the Joule-Thomson effect, is used to cool the supercritical fluid in a heat exchanger, transforming the previously problematic temperature drop into a useful cooling function.
Solution Approach 2:
The patent introduces a refrigerant fluid as an intermediary substance between the expansion device and the supercritical fluid. The refrigerant absorbs thermal energy from the supercritical fluid through a heat exchanger, preventing direct cooling at the restrictor tip that would cause plugging, while still achieving the desired refrigeration effect.
2Productivity
If high pressure is applied in chromatography, then separation efficiency is improved, but disposable plastic cartridges cannot withstand the pressure
Solution Approach 1:
The patent segments the pressure-bearing function from the chromatography separation function. The outer pressure-containing vessel is designed to withstand high system pressures (up to 10,000 psi), while the inner chromatography column can be a disposable plastic cartridge that only experiences balanced pressure, allowing standard low-pressure cartridges to be used in high-pressure systems.
Solution Approach 2:
The patent applies counterbalancing pressure to the outer surface of the chromatography column. By pressurizing the space outside the column with the same fluid at the same pressure, the net pressure differential across the column walls is reduced to near zero, allowing disposable plastic cartridges to withstand the high system pressure without failing.
3Device complexity
If traditional flash chromatography is used, then simplicity is maintained, but high solvent use is required
Solution Approach 1:
The patent changes the physical state and pressure parameters of the mobile phase from ambient-pressure liquid to high-pressure supercritical fluid. This parameter change enables more efficient mass transfer and solubility control during chromatography, reducing the volume of solvent required while maintaining separation efficiency.
Solution Approach 2:
The patent makes the system compatible with standard disposable chromatography cartridges while operating at high pressures using supercritical fluids. This multi-functionality allows the system to combine the simplicity and disposability of traditional flash chromatography with the efficiency of supercritical fluid chromatography, reducing solvent consumption without requiring specialized columns.
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 system achieves repeatable mass flow rates and proportionate pump performance, allowing high-pressure chromatography with disposable plastic cartridges and reduced solvent use, while maintaining efficient thermal management and pressure stability.
Implementation Method 1
the refrigerant absorbs thermal energy from a source of supercritical fluid placed in proximity to the expansion device
Implementation Method 2
the system uses compressed refrigerant fluid flow with a positive Joule-Thomson coefficient from the refrigerant's expansion, and commensurate temperature reduction, as it flows through an expansion device
Implementation Method 3
cyclonic separators to manage high pressures and prevent plugging
Data Source
AI summary
Provided is a high-pressure fluid chromatography system using interior-to-exterior column pressure equalization, and components comprising such a system, including a pressure equalizing vessel which allows for the use of an inner chromatography column that is only able to withstand an interior-to-exterior pressure differential of up to 200 psi.