Magnesium EDDS Salt Peroxide Stability
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Solution Overview
Problem
Current compositions using ethylenediamine disuccinic acid (EDDS) as chelating agents in bleaching processes, such as laundry and pulp and paper, face challenges in maintaining the stability of peroxide bleaching agents, which affects cost-effectiveness and performance.
Innovation Solution
Development of magnesium-containing salts of EDDS, specifically dimagnesium ethylenediamine disuccinic acid, which provides improved stability of hydrogen peroxide and other peroxygen-containing compounds by forming a composition with a high alkaline earth metal to EDDS ratio, enhancing their stability in alkaline solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sodium salts of EDDS are used as chelating agents in bleaching compositions, then the composition provides basic chelating functionality, but the stability of peroxide bleaching agents deteriorates over time
Solution Approach 1:
The patent changes the cation parameter from sodium (Na+) to alkaline earth metals (Mg2+, Ca2+), which have different charge densities and coordination properties. This parameter change fundamentally alters the chelating mechanism and its effect on peroxide stability, transforming the system from poor stabilizer to effective stabilizer
Solution Approach 2:
The invention creates a composite chelating system where alkaline earth metal ions coordinate with EDDS to form a composite structure that interacts differently with peroxide molecules. This composite material exhibits synergistic effects where the metal-EDDS complex provides enhanced stabilization compared to simple sodium salts
2Reliability
If higher concentrations of traditional chelating agents are used to improve peroxide stability, then stability increases, but the cost and complexity of the composition increases
Solution Approach 1:
By changing the cation type to alkaline earth metals, the invention achieves superior peroxide stability at lower concentrations compared to traditional sodium salts. This parameter change increases the efficiency of the chelating agent, reducing the amount needed while maintaining or improving performance
3Reliability
If magnesium-containing salts with high alkaline earth metal to EDDS ratio are used, then peroxide stability significantly improves, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies particular molar ratios (at least 1.6, preferably at least 1.75, most preferably approximately 2 moles of alkaline earth metal per mole of EDDS) to optimize the balance between manufacturing feasibility and performance. These parameter specifications provide clear manufacturing targets while achieving superior peroxide 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
The magnesium-containing salts of EDDS significantly increase the stability of hydrogen peroxide, with at least 15% additional peroxide remaining after one hour compared to compositions without the salt, and outperform traditional sodium salts in maintaining peroxide concentration, making them more effective and cost-efficient in bleaching applications.
Implementation Method 1
EDDS is an effective chelating agent, particularly of heavy metals and transition metals... magnesium-containing salts of EDDS... provides improved stability of hydrogen peroxide and other peroxygen-containing compounds by forming a composition with a high alkaline earth metal to EDDS ratio
Data Source
AI summary
The present invention provides a salt of ethylenediamine disuccinic acid comprising at least 1.6 mole of alkaline earth metal per mole of ethylenediamine disuccinic acid. Salts of the invention have been found to be useful in providing compositions comprising hydrogen peroxide having improved stability.