Hydroxamic Acid Detergent for Earthenware Spotting and Environmental Safety
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Solution Overview
Problem
There is a need for environmentally friendly, phosphate-free, and phosphonate-free machine dishwash detergent compositions that effectively reduce spotting on earthenware dishes while maintaining cleaning performance, as phosphate-based builders have led to environmental issues like eutrophication and traditional phosphonates have slow biodegradability.
Innovation Solution
A machine dishwash detergent composition comprising non-ionic surfactants, aminopolycarboxylates, and hydroxamic acid or its salts, with specific weight percentages to minimize spotting on earthenware, while being highly biodegradable and free from phosphates and phosphonates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphonates are used to reduce spotting incidence, then spotting reduction is improved, but biodegradability deteriorates and environmental harm increases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing phosphonates with hydroxamic acid (0.1-5.0 wt%) in combination with specific builders (phosphates 5-30 wt% or phosphonates 0.1-5 wt% at reduced levels). This parameter change maintains spotting reduction effectiveness while improving biodegradability and reducing environmental harm from phosphorus discharge.
Solution Approach 2:
The patent employs readily biodegradable substances that break down quickly in the environment, replacing persistent phosphonates. The hydroxamic acid and associated builders are selected for their short environmental half-life, ensuring they perform their anti-spotting function during washing but degrade rapidly afterward, preventing long-term environmental accumulation.
2Productivity
If phosphates are used as builders, then cleaning performance is improved, but environmental harm increases due to eutrophication
Solution Approach 1:
The patent modifies the builder system by using phosphates at controlled levels (5-30 wt%) combined with hydroxamic acid, or alternatively uses phosphonates at much lower levels (0.1-5 wt%). This parameter adjustment maintains effective cleaning performance while reducing the total phosphorus load discharged to the environment, thereby mitigating eutrophication risks.
3Use of energy by moving object
If phosphonates are used to achieve eco-performance, then energy consumption is reduced, but biodegradability deteriorates
Solution Approach 1:
The patent replaces slow-biodegrading phosphonates with hydroxamic acid and associated builders that are readily biodegradable. These substances maintain the low-energy washing performance enabled by phosphonates while breaking down quickly in the environment, thus resolving the contradiction between energy efficiency and biodegradability.
4Object-generated harmful factors
If phosphate-free and phosphonate-free compositions are used, then environmental friendliness is improved, but spotting incidence increases
Solution Approach 1:
The patent introduces hydroxamic acid as an intermediary substance that mediates between the conflicting requirements of environmental friendliness and spotting reduction. Hydroxamic acid, in combination with specific builders, provides the necessary water softening and anti-spotting functions without the environmental drawbacks of traditional phosphonates, thus serving as an effective intermediary solution.
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 composition achieves a superior reduction in spotting on earthenware compared to traditional phosphonate-based detergents, such as HEDP, and is environmentally friendly due to its biodegradability and absence of phosphates and phosphonates.
Implementation Method 1
To reduce the negative effects of calcium and magnesium ions on stain/soil removal so called 'builders' (complexing agents) are commonly applied in detergent compositions.
Implementation Method 2
Surfactants are employed to remove stains and soil and to disperse the released components into the cleaning liquid.
Implementation Method 3
Enzymes help to remove stubborn stains of proteins, starch and lipids by hydrolyzing these components.
Implementation Method 4
Bleach is used to remove stains by oxidizing the components that make up these stains.
Data Source
AI summary
A machine dishwash detergent composition comprising from 0.1 to 20 wt. % non-ionic surfactant; and from 0.5 to 40 wt. % of free acid equivalent of aminopolycarboxylate; and from 0.5 to 3.8 wt. % of free acid equivalent of selected hydroxamate, wherein the amount of phosphate is at most 1.0 wt.%; and wherein the amount of phosphonate is at most 1.0 wt. %.