Single Resistivity Cell for Ultrapure Water Purity Analysis
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Solution Overview
Problem
Current methods for analyzing the purity of ultrapure water after purification are costly and complex due to the need for multiple resistivity measuring cells, which introduces uncertainty and increases production costs.
Innovation Solution
A water purification device with a single resistivity measuring cell positioned between the oxidation and polishing means, utilizing a check valve and a two-position analysis valve to control fluid circulation, allowing for real-time purity analysis and reducing costs by simplifying the circuit and eliminating the need for multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple resistivity measuring cells are used to measure water purity at different points, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by measuring the resistivity of water at the inlet of the oxidation means before the oxidation process occurs. This preliminary measurement, combined with a mathematical model that accounts for the oxidation process kinetics, allows the system to calculate the resistivity that would be obtained after infinite oxidation time without actually performing the infinite oxidation. This resolves the contradiction by providing accurate purity measurement through a single cell while using predictive modeling to compensate for the lack of multiple measurement points.
Solution Approach 2:
The patent uses a single resistivity measuring cell to measure the inlet water properties, then creates a virtual representation of the outlet water quality through mathematical modeling. The model copies the essential information needed for purity assessment by simulating what the resistivity would be after complete oxidation, based on the inlet measurement and known oxidation kinetics. This eliminates the need for physical duplicate measuring cells while maintaining measurement accuracy.
2Measurement precision
If multiple resistivity measuring cells are positioned in series, then complete purity analysis is improved, but production cost increases
Solution Approach 1:
The invention creates a virtual copy of the outlet measurement through mathematical modeling. Instead of manufacturing multiple expensive resistivity cells, the system uses a single cell to measure inlet water and then computationally generates the equivalent information that would be obtained from multiple cells. This significantly reduces production costs while maintaining complete purity analysis capability through the predictive model.
Solution Approach 2:
The patent changes the approach from physically measuring multiple parameters (resistivity at multiple points) to measuring one parameter (inlet resistivity) and calculating the others through parameter transformation. The mathematical model transforms the inlet resistivity measurement into predicted outlet resistivity values under various oxidation conditions, eliminating the need for multiple physical measuring cells and reducing manufacturing costs.
3Reliability
If multiple measuring cells are used, then measurement reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The system creates a virtual measurement copy through mathematical modeling, which eliminates the operational complexity of managing multiple physical measuring cells. The model automatically processes the single inlet measurement and generates reliable outlet quality predictions, improving ease of operation while maintaining measurement reliability through the robust predictive algorithm.
Solution Approach 2:
The mathematical model performs self-service by automatically calculating the outlet water quality parameters from the inlet measurement without requiring manual intervention or coordination of multiple measuring cells. The system self-corrects and self-optimizes the purity assessment through the predictive model, making the device easier to operate while maintaining high reliability.
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 provides a more economical and user-friendly method for determining the purity of ultrapure water by reducing complexity and costs, while maintaining accurate analysis of organic compound content through real-time resistivity measurements.
Implementation Method 1
it is then passed through a second device in which those organic compounds are oxidized in order to ionize them. During this oxidation the organic compounds are degraded and the atoms of carbon are then present in the form of carbon dioxide gas, which is dissolved in water to form bicarbonate ions
Implementation Method 2
One method commonly employed measures its resistivity at the outlet from the oxidation means, which is directly linked to the dissolved carbon dioxide gas content, i.e. to the number of bicarbonate ions
Implementation Method 3
The third purification step consists in polishing the water, i.e. passing it through an ion exchange resin that blocks the ions created during the preceding step
Data Source
AI summary
This is a device for analyzing the quantity of organic compounds existing in a liquid, such as ultrapure water, at the outlet from a purification device including in series filter means (1), oxidation means (2) and polishing means (3), further including means for measuring the resistivity of water to determine the purity thereof, characterized in that it includes only one resistivity measuring cell (4) and in that the outlet points of said filter means (1) and said oxidation means (2) are connected to said resistivity measuring cell (4) by pipes provided with an analysis valve (6) and/or check valves (5) selectively enabling circulation of said liquid within them.