Aqueous Hydrogen Peroxide Measurement Under High Dissolved Oxygen
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Solution Overview
Problem
Conventional methods struggle to accurately measure low levels of hydrogen peroxide in aqueous solutions with high dissolved oxygen backgrounds, particularly in industrial applications where concentrations below 20 ppb are required, and existing detection methods are time-consuming and prone to interference.
Innovation Solution
A method and system that involves removing oxygen and hydrogen peroxide from a sample using vacuum degasification, gas transfer membranes, oxygen scavenging media, and catalyst-driven hydrogen peroxide destruction processes, followed by dissolved oxygen analysis to calculate hydrogen peroxide concentration using a control module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional dissolved oxygen analysis methods are used, then measurement simplicity is maintained, but measurement precision deteriorates due to interference from high dissolved oxygen backgrounds when measuring low hydrogen peroxide concentrations
Solution Approach 1:
The measurement process is divided into distinct stages: oxygen removal stage, hydrogen peroxide destruction stage, and measurement stage. This segmentation allows each stage to be optimized independently, with oxygen removal preparing the sample and hydrogen peroxide destruction creating a measurable signal, thereby improving measurement precision without requiring a completely complex new system.
Solution Approach 2:
Dissolved oxygen is removed from the sample before hydrogen peroxide measurement. This preliminary action eliminates the background interference that would otherwise mask low hydrogen peroxide concentrations, enabling accurate detection of trace levels down to 2 ppb while using standard measurement equipment.
2Measurement precision
If oxygen removal and hydrogen peroxide destruction processes are implemented, then measurement precision improves for low hydrogen peroxide detection, but device complexity increases
Solution Approach 1:
The system maintains continuous flow of the aqueous solution through the measurement cell, with oxygen removal and hydrogen peroxide destruction occurring continuously rather than in batch processes. This continuous operation minimizes measurement time while maintaining precision, as the solution is constantly being prepared and measured without interruption.
3Measurement precision
If multiple treatment processes are used to remove oxygen and hydrogen peroxide, then measurement precision improves, but device complexity increases
Solution Approach 1:
The measurement system is designed to perform multiple functions within a single integrated platform: oxygen removal, hydrogen peroxide destruction, and dissolved oxygen measurement. This multi-functionality allows the system to achieve high measurement precision through multiple treatment processes while avoiding the need for separate independent systems for each 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
Enables accurate detection of hydrogen peroxide concentrations as low as 2 ppb or less, even in high dissolved oxygen backgrounds, suitable for industrial applications such as semiconductor manufacturing and wastewater treatment.
Implementation Method 1
removing oxygen from at least a portion of the aqueous solution to produce a first sample
Implementation Method 2
directing the at least a portion of the aqueous solution to an oxygen removal process selected from a vacuum degasification process, a gas transfer membrane
Implementation Method 3
removing hydrogen peroxide from at least a portion of the first sample to produce a second sample... directing the at least a portion of the first sample to a catalyst-driven hydrogen peroxide destruction process
Implementation Method 4
at least one of determining the first sample concentration of dissolved oxygen and determining the second sample concentration of dissolved oxygen may comprise directing the first sample or the second sample to at least one dissolved oxygen analyzer
Data Source
AI summary
A method of determining composition of an aqueous solution is disclosed. The method includes obtaining the aqueous solution, removing oxygen from the aqueous solution, determining concentration of dissolved oxygen, removing hydrogen peroxide from the aqueous solution, and determining concentration of dissolved oxygen. The method includes calculating the difference between the concentrations of dissolved oxygen to determine concentration of hydrogen peroxide. A system for determining composition of an aqueous solution is also disclosed. The system includes a feed line connectable to a source of the aqueous solution, an oxygen removal unit, a hydrogen peroxide removal unit, and dissolved oxygen analyzers.