Series Ion Exchangers for Ultrapure Water Metal Analysis
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Solution Overview
Problem
Current methods for analyzing metal impurities in ultrapure water struggle with accurately detecting low concentrations, as ions may not be sufficiently adsorbed and captured by ion exchangers, leading to inaccurate analysis and potential leakage.
Innovation Solution
The method involves passing the liquid through two or more units of the same ion-type ion exchanger in series, with each unit having a volume of 0.5 to 5.0 ml and a differential pressure coefficient of 0.01 MPa/LV/m or less, allowing for effective capture and elution of metal impurities using a monolithic organic porous ion exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the concentration of metal impurities in the liquid is increased to improve detection accuracy, then measurement precision improves, but ions may not be sufficiently adsorbed and captured by the ion exchanger, leading to leakage and inaccurate analysis
Solution Approach 1:
The ion exchanger is divided into multiple units (first ion exchanger and second ion exchanger) connected in series. The liquid passes through each unit sequentially, allowing cumulative adsorption of metal impurities across multiple stages. This segmentation enables complete capture of ions at low concentrations while maintaining detection accuracy.
Solution Approach 2:
The patent transitions from a single ion exchanger to multiple ion exchangers arranged in series, adding a spatial dimension to the adsorption process. This multi-unit configuration increases the total adsorption capacity without requiring excessive concentration of the sample, thus maintaining reliability while improving measurement precision.
2Device complexity
If a single ion exchanger unit is used, then device complexity is reduced, but the adsorption capacity is insufficient for low-concentration metal impurities
Solution Approach 1:
The ion exchanger system is segmented into multiple units with each unit having a volume of 0.5 to 5.0 ml. This segmentation allows the system to achieve high adsorption capacity through cumulative effect while keeping each individual unit compact and manageable, balancing device complexity with functional capacity.
Solution Approach 2:
Multiple ion exchanger units are combined in a series configuration to achieve the total adsorption capacity required for analyzing low-concentration metal impurities. The cumulative adsorption capacity of multiple units provides sufficient quantity of substance for accurate measurement while maintaining reasonable device complexity.
3Quantity of substance
If the volume of the ion exchanger is increased to improve adsorption capacity, then metal impurity capture improves, but the differential pressure increases, affecting flow rate
Solution Approach 1:
The total ion exchanger volume is segmented into multiple units of 0.5 to 5.0 ml each connected in series. This segmentation distributes the pressure drop across multiple smaller units rather than one large unit, maintaining acceptable differential pressure while achieving the required total adsorption capacity through cumulative effect.
Solution Approach 2:
The patent optimizes the volume parameter of each ion exchanger unit to 0.5 to 5.0 ml, balancing adsorption capacity with pressure drop. This parameter optimization ensures sufficient metal impurity capture while maintaining differential pressure within acceptable ranges that do not excessively affect flow rate.
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 enables accurate analysis of metal impurities at concentrations less than 1 ng/L, ensuring reliable detection and minimizing leakage, thereby improving the precision of ultrapure water quality assessment.
Implementation Method 1
passing the liquid through an ion exchanger; eluting and recovering the metal impurity captured in the ion exchanger
Implementation Method 2
The monolithic organic porous ion exchanger has a network-like flow path, and has an action of physically adsorbing or capturing fine particles in addition to an electrostatic interaction
Implementation Method 3
The surface charge density of colloids and fine particles is smaller than that of ions, and they have less electrostatic interaction with ion exchange resins
Data Source
AI summary
A method for more accurately analyzing the content of a metal impurity in a liquid (ultrapure water) containing a low concentration of the metal impurity includes: passing the liquid through an ion exchanger; eluting and recovering the metal impurity captured in the ion exchanger with an eluent; and analyzing the eluent containing the eluted metal impurity and measuring the content of the metal impurity in the eluent, wherein the ion exchanger is used by connecting multiple ion exchangers of the same ion type in series, the volume of the porous ion exchangers per unit is 0.5 to 5.0 ml, and the differential pressure coefficient is 0.01 MPa/LV/m or less.