Supercritical Fluid Chromatography Peak Tailing Reduction
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Solution Overview
Problem
In supercritical fluid chromatography, sequential injection of samples leads to nonlinear column absorption behavior, resulting in peak tailing, which decreases the purity of separated chemical compounds and reduces the treatment amount per unit time, making existing technologies unsuitable for industrial mass production.
Innovation Solution
A method involving the sequential injection of samples into a mobile phase containing a supercritical fluid and a solvent, where the mobile phase composition is changed and then returned to its original state after the peak tailing of the previous sample is reduced, allowing for immediate injection of the next sample, utilizing a solvent injecting device to accelerate the reduction of tailing and improve separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If samples are injected sequentially into the mobile phase, then the treatment amount of separation per unit time is increased, but peak tailing occurs due to nonlinear column absorption behavior, which decreases the purity of separated chemical compounds
Solution Approach 1:
The patent applies parameter changes by adjusting the mobile phase composition (specifically the ratio of supercritical fluid to solvent) during the separation process. By changing the composition parameters dynamically, the system optimizes elution conditions to reduce peak tailing while maintaining high productivity in sequential sample injection mode
Solution Approach 2:
The patent implements dynamics by making the mobile phase composition adjustable and changeable during the separation process. The system transitions from a static mobile phase composition to a dynamic one that can be optimized for each separation step, allowing the system to adapt to different sample loads and reduce peak tailing effects
2Productivity
If samples are injected sequentially without sufficient waiting time for tailing reduction, then productivity is improved, but the next sample's peak becomes contaminated by the previous sample's tailing component
Solution Approach 1:
The patent uses parameter changes by adjusting the mobile phase composition to accelerate the reduction of peak tailing. By optimizing the solvent-to-supercritical fluid ratio during elution, the system reduces the time required for tailing to subside, enabling faster sequential injections without compromising purity
Solution Approach 2:
The patent applies preliminary action by pre-optimizing the mobile phase composition changes to occur during the tailing reduction period. This preliminary preparation of the elution conditions ensures that when the next sample is injected, the column is already in an optimal state for clean separation, preventing contamination
3Manufacturing precision
If the mobile phase composition is changed to reduce peak tailing, then separation efficiency is improved, but additional time is required for returning the composition to the pre-change state
Solution Approach 1:
The patent optimizes parameter changes by carefully controlling the composition adjustment of the mobile phase. By making precise changes to the solvent-to-supercritical fluid ratio, the system achieves effective peak tailing reduction while minimizing the time required to return to the original composition state, thus reducing overall cycle 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 method reduces peak tailing earlier, enabling faster sample reinjection and increasing the treatment amount per unit time, thereby enhancing the separation performance and efficiency of supercritical fluid chromatography.
Implementation Method 1
a supercritical fluid is used as a mobile phase. The supercritical fluid has higher diffusibility and lower viscosity than those of an ordinary solvent
Implementation Method 2
the components of the sample in the mobile phase are separated by regulating a pressure, a temperature, and the like of the mobile phase
Implementation Method 3
a mobile phase is formed by mixing the supercritical fluid with a solvent such as ethanol referred to as an entrainer or a modifier
Data Source
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AI summary
Provided is a method of manufacturing target substances with use of supercritical fluid chromatography, by which the following are achieved: increase in throughput of samples containing the target substances; an increase of a treatment amount of separation per unit time; and improvement of efficiency in separation. The method includes the steps of : injecting the sample containing the target substances into a mobile phase; and returning the composition of the mobile phase to a pre-change state after changing the composition of the mobile phase. The steps of changing the composition of the mobile phase and returning it to its pre-change state are performed during a period of time between detection of the peak of the last target substance of interest to elute from the column and injection of the next sample.