Capillary Ion Chromatography Suppressor with Permselective Membrane
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Solution Overview
Problem
Capillary ion chromatography systems using chemical regenerants for suppressors face issues with high dead volume, chemical handling costs, and potential leakage, which affect detection sensitivity and chromatographic performance.
Innovation Solution
A capillary ion chromatography system with a suppressor comprising flow-through ion exchange packing and capillary tubing made of a permselective ion exchange membrane, where the tubing is partially disposed in a housing, allowing for continuous regeneration using recycled aqueous sample liquid and reducing the need for external chemical regenerants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical regenerants are used for suppressor regeneration, then continuous suppression capacity is maintained, but dead volume increases and detection sensitivity decreases
Solution Approach 1:
The patent extracts the chemical regenerant from the system by implementing electrolytic regeneration using electrodes. The suppressor is regenerated in-situ by applying electrical current to generate H+ ions directly at the suppressor location, eliminating the need for external chemical regenerant reservoirs and delivery systems, thereby reducing dead volume while maintaining continuous suppression capacity.
Solution Approach 2:
The patent introduces an electrical field as an intermediary mechanism to enable suppressor regeneration. Instead of using chemical regenerants that require physical transport through tubing and chambers, electricity serves as the mediator to generate regenerant ions in-place, reducing the volume required for regeneration while maintaining continuous operation.
2Reliability
If chemical regenerants are used for suppressor regeneration, then suppression capacity is maintained, but chemical handling costs and potential leakage increase
Solution Approach 1:
The suppressor performs self-regeneration through electrolytic generation of H+ ions using electrodes positioned within or adjacent to the suppressor bed. The system uses the eluent itself as the medium for electrolysis, generating the necessary regenerant in-situ without requiring external chemical supplies, handling infrastructure, or disposal systems, thereby eliminating chemical handling costs and leakage risks.
Solution Approach 2:
The patent replaces the mechanical/chemical system of regenerant storage, pumping, and delivery with an electrical system. Instead of mechanically transporting chemical regenerants through tubing and valves, electricity is used to generate H+ ions directly at the suppressor, eliminating the harmful factors associated with chemical handling while maintaining suppression capacity.
3Reliability
If traditional suppressor designs are used, then suppression function is achieved, but system complexity and operational intervention increase
Solution Approach 1:
The patent merges the suppression and regeneration functions into a single integrated unit. The electrodes are positioned within or adjacent to the suppressor bed, allowing both suppression ion exchange and electrolytic regeneration to occur in the same location simultaneously, thereby simplifying the overall system architecture and reducing the number of separate components required.
Solution Approach 2:
The suppressor design achieves multi-functionality by combining suppression, regeneration, and eluent delivery in a single component. The same suppressor structure that performs ion exchange for suppression also contains the electrodes for electrolytic regeneration, eliminating the need for separate regeneration systems and reducing operational 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 configuration minimizes dead volume, reduces chemical handling costs, and enhances detection sensitivity by continuously regenerating the suppressor with minimal interference, improving chromatographic efficiency and reliability.
Implementation Method 1
capillary tubing having an inlet and an outlet and formed of a permselective ion exchange membrane, said tubing being at least partially disposed in said ion exchange packing
Implementation Method 2
a suppressor comprising flow-through ion exchange packing in a housing including a packing inlet and a packing outlet
Data Source
AI summary
An apparatus for capillary ion chromatography having a suppressor having flow-through ion exchange packing in a housing and capillary tubing formed of a permselective ion exchange membrane, and at least partially disposed in said ion exchange packing. Also, a recycle conduit for aqueous liquid from the detector to the packing. Further, the capillary tubing may have weakly acidic or weakly basic functional groups. Also, a method for using the apparatus.