Stable Liquid TAED Composition for Safe Bleaching
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Solution Overview
Problem
The use of peracetic acid in laundry is hindered by its corrosive and flammable properties, as well as a strong odor, necessitating the development of a stable, odor-free, and safer alternative for bleaching compositions.
Innovation Solution
A stable liquid tetraacetylethylenediamine (TAED) composition is created, comprising 15 wt% to 20 wt% TAED, 75 wt% or less water, 0.5 wt% to 2 wt% polymeric sulfonic acid, 1 wt% to 4 wt% buffer system, and 0.5 wt% to 3 wt% additive, which is compatible with peroxides and forms a peroxide solution when contacted in the presence of a reaction medium, offering similar cleaning and disinfection efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peracetic acid is used for bleaching, then cleaning and disinfection properties are improved, but safety and handling become problematic due to corrosive and flammable properties
Solution Approach 1:
The patent divides the bleaching system into separate components: a liquid TAED composition and a peroxide solution, which are dispensed separately and mix in the washing machine. This segmentation allows each component to be stored and handled safely independently, while still achieving the desired bleaching effect when combined.
Solution Approach 2:
TAED acts as an intermediary substance that reacts with peroxide to generate peracetic acid in situ during the wash cycle. This mediator approach allows the system to achieve strong bleaching properties without requiring direct handling or storage of highly reactive peracetic acid, thus improving safety.
2Reliability
If peracetic acid is used for bleaching, then disinfection properties are improved, but odor becomes problematic due to strong vinegar smell
Solution Approach 1:
The system prepares TAED and peroxide separately before use, with TAED being converted to its active form only when needed during the wash cycle. This preliminary preparation allows the disinfection-active peracetic acid to be generated at the right moment while minimizing unnecessary odor exposure during storage and handling.
Solution Approach 2:
TAED serves as an odor-free intermediary that only produces the characteristic vinegar smell of peracetic acid when it reacts with peroxide during the wash cycle. This eliminates odor issues during storage and dispensing while maintaining disinfection efficacy when the reaction occurs.
3Ease of operation
If liquid TAED composition is created, then ease of dispensing is improved, but compatibility with peroxide deteriorates causing instability
Solution Approach 1:
The patent separates the liquid TAED composition and peroxide solution into distinct dispensing systems that operate independently. This segmentation allows both components to maintain their stability individually while enabling easy liquid dispensing, and they only combine in the washing machine where the reaction is desired.
Solution Approach 2:
The patent modifies the chemical parameters of the TAED composition by adding specific additives and adjusting pH levels to create a formulation that remains stable in liquid form and is compatible with peroxide solutions, preventing unwanted reactions during storage and dispensing.
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 liquid TAED composition provides enhanced shelf stability and safe handling, maintaining effective bleaching and disinfection properties comparable to peracetic acid, while eliminating safety and odor concerns, and is suitable for use in automatic dispensing systems.
Implementation Method 1
PAA could be created in situ, by reaction of the weaker bleach, hydrogen peroxide (or derivatives like sodium percarbonate, sodium perborate, and other similar oxygen carrying derivatives), and a bleach activator. For example, PAA could be created in a washer after reacting hydrogen peroxide with tetraacetylethylenediamine (TAED)
Data Source
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AI summary
The presently disclosed subject matter is directed to a stable liquid tetraacetylethylenediamine composition that can be used in hot and cold temperature washes. The disclosed liquid tetraacetylethylenediamine composition comprises tetraacetylethylenediamine, water, polymeric sulfonic acid, a buffer system and at least one additive. Also disclosed is a method for preparing a peroxide solution using a stable liquid tetraacetylethylenediamine composition and a peroxide and a method of using the peroxide solution.