Liquid Chromatograph Mobile Phase Pre-cooling for Rapid Column Cooling
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Solution Overview
Problem
Existing temperature adjustment devices for liquid chromatography separation columns take a long time to reduce the temperature after a separating step, making it difficult to prepare the column for the next analysis.
Innovation Solution
A liquid chromatograph system that includes a second temperature adjustment device upstream of the separation column, which adjusts the mobile phase to a lower temperature before the next sample is injected, allowing for quick cooling of the separation column by feeding a mobile phase adjusted to this lower temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cold air circulation-type or aluminum block heat conduction-type temperature adjustment device is used to reduce the temperature of the separation column, then the separation column temperature can be reduced, but it takes a long time to complete the temperature reduction
Solution Approach 1:
The mobile phase is pre-cooled in a cooling chamber before being introduced into the separation column. This preliminary cooling action allows the mobile phase to arrive at the separation column already at the desired lower temperature, significantly reducing the time required to cool the separation column compared to cooling it directly from the outside.
Solution Approach 2:
The mobile phase serves as an intermediary heat transfer medium. Instead of directly cooling the separation column with cold air or through thermal conduction from an aluminum block, the pre-cooled mobile phase flows through the column, efficiently transferring heat from the column interior to the mobile phase, which then carries the heat away. This intermediary approach dramatically accelerates the cooling process.
2Productivity
If the temperature of the separation column is reduced quickly after the separating step, then the analysis time is shortened, but existing temperature adjustment devices are designed for heating or baseline stabilization rather than rapid cooling
Solution Approach 1:
The mobile phase cooling system serves multiple functions: it cools the mobile phase before injection, rapidly cools the separation column after analysis, and maintains the separation column at the optimal temperature during analysis. This multi-functional design allows a single system to handle both heating and cooling requirements, as well as temperature maintenance, thereby reducing analysis time without requiring separate dedicated cooling equipment.
Solution Approach 2:
The mobile phase is pre-cooled in advance in the cooling chamber before being introduced into the separation column. This preliminary cooling prepares the mobile phase for rapid heat exchange with the separation column, enabling quick temperature reduction of the column after the separating step and thus shortening the overall analysis time.
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 significantly shortens the analysis time by rapidly reducing the temperature of the separation column, enabling quicker preparation for the next analysis.
Implementation Method 1
a second temperature adjustment device which is provided upstream of the separation column in the flow channel and adjusts temperature of the mobile phase to a second temperature lower than the first temperature
Implementation Method 2
the mobile phase adjusted to the second temperature is fed to the separation column before the next sample is injected, enabling quicker preparation for the next analysis
Data Source
AI summary
A liquid chromatograph includes a liquid feeding portion, a sample injection portion, a separation column, a first temperature adjustment device which raises temperature of the separation column to a first temperature, a detector, a second temperature adjustment device which is provided upstream of the separation column and adjusts temperature of a mobile phase to a second temperature lower than the first temperature, and a control device which controls at least one of the liquid feeding portion and the second temperature adjustment device. The control device controls at least one of the liquid feeding portion and the second temperature adjustment device such that the mobile phase adjusted to the second temperature is fed to the separation column before a next sample is injected after separation of sample components by the separation column ends.