Preparative Chromatograph Delay Time Adjustment via CO2 Injection
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Solution Overview
Problem
Existing preparative chromatographs require adjustment of flow path switching timing based on the delay time of the mobile phase, which becomes impractical when switching to a mobile phase with a different delay time.
Innovation Solution
A preparative chromatograph that includes a separation column, a detector, and a fractionator with a gas-liquid separator, where carbon dioxide is supplied to the flow path between the separation column and the fractionator to increase the flow velocity of the sample components, thereby adjusting the delay time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mobile phase with a relatively long delay time is used, then the separation efficiency is improved, but the delay time becomes excessively long causing reduced productivity
Solution Approach 1:
The flow path is divided into two segments: the first flow path carrying the mobile phase with long delay time for optimal separation, and the second flow path carrying carbon dioxide with short delay time. This segmentation allows each path to serve its specific function - the mobile phase path optimizes separation while the CO2 path provides rapid component transport to the fractionator.
Solution Approach 2:
Carbon dioxide acts as an intermediary substance that bridges the gap between the mobile phase outlet and the fractionator. The CO2 is introduced at the junction point to carry the separated components from the mobile phase to the fractionator, effectively decoupling the separation process (which benefits from long delay time) from the collection process (which benefits from short delay time).
2Measurement precision
If the flow path switching timing is adjusted for a mobile phase with different delay time, then the delay time accuracy is improved, but the operational complexity increases
Solution Approach 1:
The system changes the physical parameter of the carrier gas by introducing carbon dioxide instead of using the mobile phase alone. This parameter change (switching from mobile phase carrier to CO2 carrier) fundamentally alters the delay time characteristics of the second flow path, allowing accurate and rapid component transport to the fractionator regardless of the mobile phase's delay time characteristics.
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 introduction of carbon dioxide into the flow path allows for the adjustment of delay time, enabling efficient preparative isolation even when using mobile phases with relatively long delay times, similar to those with short delay times.
Implementation Method 1
a fractionator including a gas-liquid separator configured to separate a fluid containing the components of the sample into a gas and a liquid
Data Source
AI summary
A preparative chromatograph includes a separation column, and a detector provided downstream of the separation column. Furthermore, the preparative chromatograph includes a fractionator including a gas-liquid separator configured to separate a fluid containing components of a sample into a gas and a liquid, the fractionator being provided downstream of the detector. The preparative chromatograph is configured to supply carbon dioxide to a flow path between the separation column and the fractionator.