Pyridinium Bleach Activators for Flexible Peroxy Acid Generation
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Solution Overview
Problem
Existing bleach activators for hydrogen peroxide do not offer sufficient design flexibility and efficacy enhancement.
Innovation Solution
Development of novel pyridinium compounds represented by specific general formulas that react with hydrogen peroxide to produce organic peroxy acids, enhancing bleaching power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing bleach activators are used, then bleaching function is provided, but design flexibility is insufficient
Solution Approach 1:
The patent modifies the molecular structure of pyridinium compounds by changing parameters such as substituting halogen atoms at different positions (2, 4, or 6) of the pyridine ring, varying the length and composition of alkylene groups (R11, R21, R31), and introducing different functional groups (Z21 options: —COO—R22, —CONH—R23, —CON(R24)(R25)). These structural parameter changes enable design flexibility while maintaining bleaching activator efficacy through systematic exploration of chemical space.
Solution Approach 2:
The patent creates composite molecular structures by combining pyridinium core with various functional groups and alkylene chains. The compounds integrate multiple functional elements (halogen substitution, carboxylate, amide, ester groups, and hydrophobic alkylene chains) to achieve both design flexibility and enhanced bleaching performance through synergistic effects of the composite structure.
2Adaptability or versatility
If novel pyridinium compounds are developed, then design flexibility is improved, but synthesis complexity increases
Solution Approach 1:
The patent segments the molecular structure into distinct modular components: the pyridinium core, halogen substitution patterns, alkylene chain segments (R11, R21, R31), and functional group modules (Z21 options). This segmentation allows independent optimization and simplifies synthesis planning by enabling modular assembly of components rather than requiring complex one-pot syntheses for each variant.
Solution Approach 2:
The patent develops a universal pyridinium compound framework that can serve multiple functions: the same core structure with different substituents can act as bleach activators, and the modular design allows the same synthesis methodology to generate multiple compounds by simply changing substituents. This universality reduces overall synthesis complexity despite the diversity of individual compounds.
3Stability of the object's composition
If pyridinium compounds with long alkylene groups are used, then hydrophobicity is increased, but solubility may be reduced
Solution Approach 1:
The patent applies local quality by placing hydrophobic alkylene groups (R11, R21, R31 with 1-24 carbons) at specific locations on the pyridinium molecule while maintaining polar functional groups (carboxylate, amide, or ester groups at Z21 positions) at other locations. This localized distribution of hydrophobic and hydrophilic characteristics enables fine-tuning of overall solubility while achieving the desired hydrophobicity for membrane penetration or emulsion stability.
Solution Approach 2:
The patent uses intermediate functional groups (carboxylate, amide, ester groups at Z21) as mediators between the hydrophobic alkylene chains and the polar pyridinium core. These intermediary groups can form hydrogen bonds or ionic interactions with water molecules, acting as bridges that reduce the solubility penalty imposed by long hydrophobic alkylene chains while maintaining the necessary hydrophobic character for biological membrane penetration.
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 novel pyridinium compounds provide improved bleaching performance and design flexibility as bleach activators, applicable in various industrial and chemical processes.
Implementation Method 1
react with hydrogen peroxide to produce organic peroxy acids
Implementation Method 2
react with hydrogen peroxide to produce organic peroxy acids (activated species)
Data Source
AI summary
A pyridinium compound represented by the following general formula (1), (2) or (3):wherein X11, X21 and X31 each represent a halogen atom being bonded to a carbon atom at position 2, 4 or 6 of the pyridine ring; R11 is an alkylene group having 1 to 24 carbons and which may contain a heteroatom; Z21 is a group selected from —COO—R22, —CONH—R23 and —CON(R24)(R25), Z21 being bonded to a carbon atom of the pyridine ring different from the carbon atom to which X21 is bonded; R21 is an alkyl group having 3 to 24 carbons and which may contain a heteroatom; R22, R23, R24 and R25 each represent an alkyl group with 3 or more carbons which may contain a heteroatom; R31 is a branched alkyl group having 10 to 24 carbons and which may contain a heteroatom; and A21− and A31− each represent an anion.