Chromatography Column Thermal Control via Dynamic Set Points
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Solution Overview
Problem
Chromatography systems face challenges in managing radial thermal gradients within chromatography columns, which can lead to band broadening and diminished performance due to frictional heating and Joule-Thompson cooling effects.
Innovation Solution
The implementation of a chromatography system that includes a vacuum insulating jacket and an inlet heater, along with a controller that estimates the temperature set point for the outlet heater or cooler based on pressure delta, flow rate, and inlet temperature, to maintain optimal thermal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the chromatography column is placed in a column oven to match the column wall temperature, then radial thermal gradients are reduced, but the system complexity and energy consumption increase
Solution Approach 1:
The patent extracts the thermal management function from a conventional column oven and implements it through localized heating elements positioned adjacent to specific zones of the chromatography column. This allows temperature control to be achieved without requiring a full column oven, thereby reducing system complexity while maintaining thermal gradient control.
Solution Approach 2:
The patent applies heating elements at specific locations (inlet and outlet zones) rather than uniformly heating the entire column. This localized heating approach addresses radial thermal gradients in the most critical zones where temperature mismatches occur, reducing overall system complexity compared to omnidirectional heating.
2Temperature
If the chromatography column is insulated with vacuum insulating jackets to reduce radial heat transfer, then radial thermal gradients are reduced, but the ability to actively control temperature at inlet/outlet decreases
Solution Approach 1:
The patent positions heating elements adjacent to the inlet and outlet zones of the column before the mobile phase enters and exits. These pre-positioned heaters proactively adjust the temperature of the mobile phase at the critical transition zones, compensating for thermal effects before they impact chromatographic performance.
Solution Approach 2:
The heating elements act as intermediary devices between the insulated column and the thermal environment. They provide controlled thermal input to the mobile phase at specific locations without requiring direct contact with the column, thus maintaining insulation integrity while enabling active temperature management.
3Manufacturing precision
If heaters are positioned at the inlet and outlet of the chromatography column to avoid temperature mismatch, then band broadening is reduced, but the device complexity increases
Solution Approach 1:
The patent applies heating only to the critical inlet and outlet zones of the column rather than along the entire column length. This partial heating approach addresses the specific problem areas where temperature mismatch causes band broadening, achieving improved chromatographic performance with minimal additional device complexity.
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 effectively reduces radial thermal gradients, improves chromatographic performance by maintaining consistent thermodynamic conditions across the column, and enhances the efficiency of the chromatography system.
Implementation Method 1
A particularly promising approach to insulating the chromatography columns is to use vacuum insulating jackets around all or a substantial portion of a chromatography column.
Implementation Method 2
heaters may be positioned at the inlet and the outlet of the chromatography column
Implementation Method 3
When both flow rate and pressure drop are too large, frictional heating of the mobile phase passing through the column over the stationary phase occurs.
Implementation Method 4
such as with supercritical fluid chromatography (SFC), the center of the column is cooler than the radial portion of the column due to Joule-Thompson cooling.
Data Source
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Figure 3A
AI summary
The exemplary embodiments may determine a temperature set point for an outlet heater or cooler (114) based on available information without requiring user input or requiring only minimal user input. The exemplary embodiments may estimate the temperature set point of the outlet heater (114) based on available information, such as pressure delta along the column (110), temperature at the inlet (6) of the chromatography column (110), and volumetric flow rate. In some instances, the estimate may be normalized for column dimensions, such as length and diameter. Tailing factor may also be used in determining the estimate. The estimate is not computationally burdensome and can be recalculated as the chromatography column is in use.