Chromatography Sample Injection Mixing Chamber
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Solution Overview
Problem
In highly compressible fluid chromatography, introducing a liquid sample into a mobile phase like carbon dioxide leads to significant peak distortion due to solvent mismatch, resulting in performance losses in both analytical and preparative systems.
Innovation Solution
The use of two or one valve systems that draw the liquid sample into a metering device and mix it with the mobile phase, such as carbon dioxide, before injection into a chromatography column, minimizing the solvent-mismatch issue and allowing for sharper peaks and increased sample injection volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid sample is introduced directly into the mobile phase (mixed-stream injection), then the injection process is simple and fast, but severe peak distortion occurs due to solvent mismatch
Solution Approach 1:
The patent applies preliminary action by pre-mixing the liquid sample with the mobile phase (carbon dioxide) in a mixing chamber before injection. This pre-mixing step ensures that the sample solvent is already compatible with the mobile phase when introduced into the chromatography system, preventing peak distortion while maintaining efficient injection.
Solution Approach 2:
The patent introduces a mixing chamber as an intermediary component between the sample injection port and the chromatography column. This mixing chamber serves as a mediator where the liquid sample and mobile phase are combined and homogenized before entering the column, resolving the solvent mismatch problem without compromising injection speed.
2Manufacturing precision
If sample is prepared with carbon dioxide based solvent to match mobile phase, then peak distortion is prevented, but sample preparation becomes more complex and costly
Solution Approach 1:
The patent extracts the mixing function from the sample preparation step and relocates it to the chromatography system itself. By providing a mixing chamber within the injection system, the patent eliminates the need for complex pre-preparation of carbon dioxide-based sample solvents, while still achieving peak shape improvement.
Solution Approach 2:
The chromatography system performs the solvent matching function itself through the integrated mixing chamber, rather than requiring external sample preparation. The system self-adjusts by mixing the liquid sample with mobile phase in situ, reducing both device complexity and operational burden.
3Productivity
If larger injection volumes are used to increase productivity, then more sample can be analyzed, but peak distortion becomes more severe
Solution Approach 1:
By pre-mixing the sample with mobile phase in the mixing chamber before injection, the patent enables larger injection volumes without peak distortion. The preliminary mixing ensures that even large volumes of liquid sample are already compatible with the supercritical mobile phase when introduced into the column.
Solution Approach 2:
The patent changes the physical state parameters of the mobile phase (maintaining it in supercritical state) and uses this to dissolve and mix with the liquid sample in the mixing chamber. This parameter change allows larger injection volumes to be accommodated while maintaining peak shape integrity.
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 results in sharper peaks for improved resolution in analytical systems and increased productivity in preparative systems, while reducing system complexity and cost by minimizing the number of components needed.
Implementation Method 1
mixing a liquid sample with a highly compressible fluid (for example, carbon dioxide) to mix and pressurize the liquid sample
Implementation Method 2
mixing a liquid sample with a highly compressible fluid (for example, carbon dioxide) to mix and pressurize the liquid sample
Data Source
AI summary
The disclosure relates to a system for liquid sample introduction into a chromatography system. The system includes a metering device for drawing up the liquid sample, a first multi-port valve in fluid communication with a first end of the metering device and the liquid sample, a second multi-port valve in fluid communication with a second end of the metering device and a chromatography column, and a pump in fluid communication with the second multi-port valve and a mobile phase. When the valves are in a first position the metering device draws up the liquid sample filling a portion of the metering device. When the valves are in a second position, a remaining portion of the metering device is filled with the mobile phase thereby mixing with and pressurizing the liquid sample. When the valves are in a third position, the mixed and pressurized sample flows to the chromatography column.