Lithium Salt Stabilization of Phthalimido Percarboxylic Acid
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Solution Overview
Problem
Organic peracids, including phthalimido percarboxylic acids used as bleaching agents in detergents, suffer from low thermal stability, leading to a decrease in active oxygen even under conventional storage conditions, necessitating stabilization, and the use of boric acid for this purpose is becoming undesirable due to regulatory concerns.
Innovation Solution
A mixture comprising phthalimido percarboxylic acid and an inorganic lithium salt, particularly lithium sulfate, is used to stabilize the acid, preventing degradation by blocking nucleophilic reactions and maintaining bleaching activity over time without relying on boric acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If boric acid is used to stabilize phthalimido percarboxylic acid, then long-term stability is improved, but environmental and regulatory concerns worsen
Solution Approach 1:
The patent replaces boric acid with lithium sulfate, a more environmentally acceptable stabilizer. Lithium sulfate achieves comparable stabilization效果 without the environmental and regulatory issues associated with boric acid, allowing the product to meet both stability requirements and environmental concerns
Solution Approach 2:
The patent changes the chemical composition parameter by substituting boric acid with lithium sulfate. This parameter change maintains the stabilizing function while eliminating the harmful aspects of boric acid, resolving the contradiction between stability and environmental concern
2Device complexity
If no stabilizer is used, then formulation simplicity is improved, but active oxygen decrease worsens
Solution Approach 1:
The patent extracts the stabilizing function from complex stabilization systems and implements it through a simple lithium sulfate additive. This single component provides effective stabilization while maintaining formulation simplicity, addressing both the need for stability and ease of formulation
Solution Approach 2:
Lithium sulfate provides self-service stabilization by preventing nucleophilic attack on the percarboxylic acid through its lithium cation. The stabilizer works autonomously to maintain active oxygen levels without requiring complex systems or multiple components
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 lithium salt effectively stabilizes phthalimido percarboxylic acids, ensuring sustained bleaching activity during storage, outperforming traditional stabilization methods like boric acid and sodium sulfate, as demonstrated by long-term stability tests.
Implementation Method 1
preventing degradation by blocking nucleophilic reactions
Data Source
AI summary
The present invention relates to a mixture for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one lithium salt, to a detergent composition comprising said mixture, and to the use of at least one lithium salt for stabilizing a phthalimido percarboxylic acid in a detergent composition.