Ion-Exchange Membrane Suppressor Without Fillers
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Solution Overview
Problem
Conventional ion chromatograph suppressors using ion-exchange membranes are prone to displacement due to pressure differences, leading to unstable chromatograms and increased pressure losses when filled with fillers, which can cause leakage and variations in performance over time.
Innovation Solution
A suppressor design with an ion-exchange membrane supported by wall surfaces on both sides, where the eluate and regenerant channels are arranged in parallel without fillers, preventing membrane displacement and maintaining ion exchange functionality, thereby reducing pressure differences and eliminating the need for increased liquid feed pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If channels are filled with ion-exchange resin as a filler to prevent membrane displacement, then membrane displacement is prevented, but pressure losses in the channels are increased and liquid feed pressures need to be increased
Solution Approach 1:
The invention extracts and removes the filler (ion-exchange resin) from the channel structure, replacing it with a simplified design where the ion-exchange membrane itself forms the functional channel wall. This eliminates the filler material that caused pressure losses while maintaining the membrane's structural stability through direct integration with the channel architecture.
Solution Approach 2:
The invention utilizes the ion-exchange membrane as a thin film structure that directly forms part of the channel wall, eliminating the need for rigid filler materials. The membrane's flexibility and structural integrity allow it to maintain channel geometry and prevent displacement without requiring additional filler support structures that would increase pressure losses.
2Stability of the object's composition
If channels are filled with ion-exchange resin to prevent membrane displacement, then membrane displacement is prevented, but the activity of the ion-exchange resin changes due to repeated use causing changes in ion chromatogram
Solution Approach 1:
The invention removes the ion-exchange resin filler from the channel structure, eliminating the source of performance variation. By using the membrane itself as the functional element without additional filler resin, the system avoids the degradation and activity changes that occur with repeated use of filler materials, ensuring consistent chromatogram results.
Solution Approach 2:
The ion-exchange membrane serves multiple functions simultaneously: it acts as the separation barrier, forms the channel structure, and provides the ion-exchange functionality. This multi-functionality eliminates the need for separate filler resin that would degrade over time, ensuring long-term reliability and consistent performance.
3Loss of energy
If liquid feed pressures are increased to compensate for pressure losses from filler, then pressure losses are compensated, but the load on the ion-exchange membrane increases causing leakage
Solution Approach 1:
The invention removes the filler material that caused pressure losses in the first place, eliminating the need to increase liquid feed pressure. By designing channels without filler, the system maintains lower operating pressures that do not exceed the membrane's structural limits, preventing leakage while maintaining effective ion exchange function.
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 solution effectively prevents ion-exchange membrane displacement, maintains stable ion exchange function, and reduces the risk of liquid leakage, ensuring consistent chromatogram performance without the need for fillers, which would increase pressure and potentially cause leakage.
Implementation Method 1
The suppressor removes nontarget ions contained in an eluate discharged from a separation column to reduce the electrical conductivity of the eluate
Implementation Method 2
the ionic functional groups can move to the eluate channel through the ion-exchange membrane
Data Source
AI summary
A suppressor which comprises: an ion-exchange membrane; an eluate channel which is in contact with one side of the ion-exchange membrane, serves as a channel through which an eluate discharged from a separation column flows, and has inside no obstacle to the flow; a regenerant channel which is in contact with the other side of the ion-exchange membrane, serves as a channel through which a regenerant for regenerating ionic functional groups of the ion-exchange membrane flows, has been disposed so that the regenerant channel has no region facing the eluate channel and extends in parallel to the eluate channel in such a nearby position that the ionic functional groups can move through the ion-exchange membrane, and has inside no obstacle to the flow; and an ion-exchange membrane support member which is in contact at least with that region on one side of the ion-exchange membrane which is opposed to the regenerant channel and with that region on the other side of the ion-exchange membrane which is opposed to the eluate channel to thereby support the ion-exchange membrane with wall surfaces.