Xanthydrol Detection Reagent for Urea Analysis in Semiconductor Water
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Solution Overview
Problem
Current membrane technologies are inadequate for detecting and removing urea from reclaimed water, as it is a neutral small molecule that is difficult to detect and remove, posing challenges for semiconductor production and water quality testing, especially when urea concentrations exceed 5 ppb, which can affect photolithography processes and product quality.
Innovation Solution
A detection reagent formed by reacting a catalyst, such as Pt, Ru, or Rh loaded on a support, with xanthydrol is used to detect primary amide compounds like urea, allowing for the formation of a product that can be separated and analyzed to confirm concentration, with the reagent being more stable and efficient compared to strong acid-catalyzed reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If membrane technology is used to remove urea from reclaimed water, then water purification is achieved, but urea removal is ineffective because urea is a neutral small molecule that cannot be removed by current membrane technology
Solution Approach 1:
The invention changes the chemical state of urea by converting it from a neutral molecule to a charged complex through chemical reaction with xanthydrol. This parameter change (from neutral to charged) enables the converted urea to be effectively removed by membrane technology, resolving the contradiction between membrane technology effectiveness and urea removal efficiency
Solution Approach 2:
The invention introduces xanthydrol as an intermediary substance that reacts with urea to form a detectable and removable complex. This intermediary enables both detection and removal functions that were previously impossible with membrane technology alone, addressing both the detection and removal effectiveness issues
2Measurement precision
If strong acid-catalyzed reaction is used to detect urea, then detection capability is achieved, but reagent stability deteriorates and by-products increase
Solution Approach 1:
The invention changes the catalytic parameter from strong acid to metal catalyst (Pt, Ru, or Rh), which maintains the ability to catalyze the reaction between xanthydrol and urea while significantly improving reagent stability and reducing by-product formation. This parameter change resolves the contradiction between detection capability and reagent stability
Solution Approach 2:
The invention replaces the unstable strong acid catalyst with a more stable metal catalyst system that can be used repeatedly without rapid degradation. This substitution creates a longer-lived, more stable reagent system that maintains detection precision over extended periods
3Measurement precision
If conventional detection methods are used for urea, then detection is attempted, but detection precision is insufficient for concentrations as low as 3 ppb
Solution Approach 1:
The invention utilizes fluorescence emission as a detectable signal change that occurs when xanthydrol reacts with urea in the presence of metal catalyst. This optical signal change enables highly sensitive detection at concentrations as low as 3 ppb, overcoming the limitations of conventional detection methods and achieving the required measurement precision for semiconductor industry standards
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 detection reagent enables accurate detection of urea at concentrations as low as 3 ppb, is more stable with minimal by-products, and can be stored for extended periods, simplifying the detection process and ensuring compliance with water quality specifications, thereby supporting semiconductor production and water recycling efforts.
Implementation Method 1
the catalyst comprises an active component loaded on a support, and wherein the active component comprises Pt, Ru, Rh, or a combination thereof
Data Source
AI summary
Detection reagent is formed by reacting a catalyst and xanthydrol. The catalyst includes an active component loaded on a support, wherein the active component includes Pt, Ru, Rh, or a combination thereof, and the support includes carbon material, silica, alumina, or calcium carbonate. The detection reagent can be used to detect the primary amide compound.