Anionic Polymer Concentration Measurement Using Cationic Dye Buffers
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Solution Overview
Problem
Current methods for determining the concentration of anionic water-soluble polymers in industrial water systems face issues such as instability, narrow dynamic range, and interference from naturally occurring components and ionic strength, leading to inaccurate and cumbersome measurements.
Innovation Solution
A method involving the use of a multifunctional buffer solution with masking agents and cationic dyes to measure absorbance changes, allowing for the determination of polymer concentration through calibration equations, while stabilizing agents minimize precipitation and interference from surfactants and other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cationic dyes are used to determine polymer concentration, then measurement capability is provided, but dye instability in aqueous solutions causes measurement inaccuracy
Solution Approach 1:
The patent introduces an intermediary substance (counterion or surfactant) that mediates between the cationic dye and the anionic polymer. This intermediary forms a stable complex with the dye, preventing direct interaction that would cause precipitation, while still allowing the dye to bind to the polymer for measurement. This resolves the contradiction by maintaining both measurement capability and solution stability.
Solution Approach 2:
The patent modifies the chemical parameters of the dye solution by adding specific counterions or surfactants that change the solution's stability characteristics. This parameter change allows the dye to remain stable in aqueous solution while retaining its ability to interact with and measure polymer concentration.
2Measurement precision
If conventional dye methods are used, then polymer detection is possible, but interference from naturally occurring polymers and ionic strength limits measurement reliability
Solution Approach 1:
The patent converts the harmful interference from ionic strength and natural polymers into a beneficial selectivity mechanism. By choosing a specific counterion or surfactant that preferentially interacts with the target anionic polymer over natural polymers, the interference is transformed into enhanced selectivity for the desired measurement.
Solution Approach 2:
The patent applies local quality by selecting specific counterions or surfactants with particular chemical properties that are optimized for interacting with the target polymer while being less responsive to interfering substances. This localized optimization of chemical properties enhances measurement reliability in the presence of interferences.
3Adaptability or versatility
If dynamic range is expanded, then broader polymer concentrations can be measured, but measurement stability decreases
Solution Approach 1:
The patent introduces dynamic adjustability by allowing the concentration of counterion or surfactant to be optimized based on the expected polymer concentration range. This dynamic parameter adjustment enables the system to maintain stability across a broader measurement range, resolving the contradiction between range and stability.
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 provides a more accurate, stable, and reproducible method for determining anionic polymer concentrations, suitable for industrial applications, by selecting dyes with strong interactions and using multifunctional buffers to address interference and stability issues.
Implementation Method 1
the presence of impurities may impact the process in question... compounds that inhibit scale formation are added... water-soluble polymers... based on the interaction between cationic dyes and water-soluble polymers
Implementation Method 2
adding a multifunctional buffer solution to said sample, wherein said multifunctional buffer solution comprises at least one masking agent selected from the group consisting of bivalent manganese salt, ferrous salt, calcium salt, zinc salt, quaternary amine surfactant
Implementation Method 3
measuring absorbance of the admixture of step (b) above at selected wavelength(s) and (d) determining the polymer or oligomer concentration from the absorbance values
Data Source
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AI summary
In one aspect, the invention is directed to a method for determining the concentration of anionic polymers or oligomers in industrial water comprising combining a buffer solution and a cationic dye solution, measuring absorbance of the buffer-dye admixture at selected wavelength(s) and determining the polymer or oligomer concentration from the previously determined absorbance values. In alternate embodiments of the invention, the buffer solution may be a multifunctional buffer solution and may be comprised of multiple buffers, masking agents, and/or stabilizing agents and combinations thereof. Other embodiments provide that multiple dyes may be employed.