Preservative-Free Dye Solution for Continuous Washing Agent Production
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Solution Overview
Problem
Continuous methods for preparing liquid washing or cleaning agents face challenges with preservative-free dye solutions, as they require frequent sanitization of the dosing line and generate wasteful production stoppages and wastewater, especially when using non-preserved aqueous dye solutions.
Innovation Solution
A method involving a preservative-free dye solution dissolved in water and subsequently diluted in a non-aqueous organic solvent to at least 70 wt. % content, allowing for continuous dosing without the need for frequent sanitization, as the dye solution is formulated with a high organic solvent concentration to prevent microbiological contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If aqueous dye solutions are used without preservatives, then the production of preservative-free washing agents is improved, but the dosing line requires frequent sanitization and production stoppages occur
Solution Approach 1:
The patent changes the fundamental parameter of the dye solution from aqueous to organic-based, with the organic solvent comprising 30-95 wt.% of the dye solution. This parameter change eliminates the need for preservatives while maintaining microbial stability, allowing continuous operation without frequent sanitization stoppages.
2Object-affected harmful factors
If aqueous dye solutions are used without preservatives, then the use of preservatives is reduced, but wastewater generation increases due to frequent sanitization
Solution Approach 1:
The patent transitions from aqueous to organic dye solutions (30-95 wt.% organic solvent), which eliminates preservative requirements and consequently reduces wastewater generation from frequent sanitization operations, addressing both environmental concerns simultaneously.
3Ease of manufacture
If aqueous dye solutions are used, then the dye solution is easy to prepare, but microbiological contamination occurs requiring preservatives or frequent replacement
Solution Approach 1:
The patent changes the solvent basis from water to organic solvents (30-95 wt.%), which inherently provides microbiological stability without preservatives. The dye is dissolved in the organic solvent at controlled concentrations, maintaining both ease of preparation and reliability.
Solution Approach 2:
The patent creates a composite dye solution system combining dye compounds with organic solvents (such as alcohols, esters, or ketones) at specific concentrations. This composite formulation provides inherent microbial stability while maintaining dye functionality and ease of manufacturing.
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
This approach enables the continuous production of preservative-free washing agents, reducing the frequency of sanitization and waste generation, while maintaining the visual and microbial stability of the dye solution.
Implementation Method 1
the dye first being dissolved in water and this premixture subsequently being diluted in a non-aqueous organic solvent, the content of the organic solvent being at least 70 wt. % based on the total weight of the dye solution
Data Source
AI summary
A continuous method for preparing a liquid washing or cleaning agent which includes at least one surfactant and at least one dye. In this case, the dye solution used in the method according to the invention is free of preservatives. The present invention also relates to washing or cleaning agents which are obtained by way of the method according to the invention.