Concentrated Surfactant Blends With Low Dioxane and Solvent-Free Flow
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Solution Overview
Problem
Existing processes for making concentrated surfactant blends, particularly for liquid hand dishwashing detergents, face challenges in achieving low viscosity without solvents, controlling viscosity and color, and minimizing 1,4-dioxane by-products, while maintaining sudsing and low-temperature stability.
Innovation Solution
A process involving a blend of alkyl sulfated and alkyl glycol sulfate anionic surfactants is developed, using a specific alcohol stream with controlled ethylene glycol distribution and minimal alkoxylation, followed by sulfation and neutralization to create a surfactant blend with reduced 1,4-dioxane formation and lower viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkyl alkoxylated sulfate anionic surfactants are used to achieve high sudsing and low-temperature stability, then cleaning performance is improved, but viscosity control becomes difficult and 1,4-dioxane by-products increase
Solution Approach 1:
The patent changes the chemical structure parameter by using alkyl glycol sulfates with specific ethylene glycol unit distributions (n=1-3) instead of traditional alkyl alkoxylated sulfates. This structural modification maintains the desired sudsing and low-temperature stability while significantly reducing 1,4-dioxane formation during synthesis and storage.
Solution Approach 2:
The patent converts the harmful effect of 1,4-dioxane formation into a benefit by selecting surfactant structures that inherently resist dioxane formation. The alkyl glycol sulfate structure with controlled ethylene glycol units transforms the synthesis process to produce less harmful by-products while maintaining cleaning performance.
2Ease of operation
If conventional surfactant blends are made to achieve desired viscosity, then processing complexity increases due to solvent addition, but flowability is improved
Solution Approach 1:
The patent extracts and eliminates the need for solvent additives by designing surfactant blends with inherently appropriate viscosity characteristics. The specific combination of alkyl glycol sulfates and alkyl sulfates achieves desired flowability without requiring ethanol or other solvents, thereby reducing processing complexity and safety concerns related to flammable materials.
3Productivity
If higher temperatures are used during sulfation to reduce viscosity, then throughput is improved, but 1,4-dioxane residual amounts increase
Solution Approach 1:
The patent changes the surfactant molecular structure parameter to alkyl glycol sulfates with specific ethylene glycol unit distributions. This structural change allows the sulfation process to proceed at lower temperatures while maintaining high throughput, because the modified structure is less prone to forming 1,4-dioxane even under reduced thermal conditions.
4Object-affected harmful factors
If concentrated surfactant blends are made without solvents to improve environmental sustainability, then environmental profile is improved, but viscosity control becomes challenging
Solution Approach 1:
The patent creates a composite surfactant blend system combining alkyl glycol sulfates and alkyl sulfates in specific ratios. This composite formulation achieves the desired viscosity characteristics without solvents, maintaining both environmental sustainability and manufacturing precision through the synergistic interaction of the two surfactant types.
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 process results in a surfactant blend that is readily flowable, requires minimal solvent, and exhibits improved sudsing, low-temperature stability, and reduced 1,4-dioxane levels, facilitating efficient detergent production with enhanced performance.
Implementation Method 1
sulphating the alcohol stream to provide an alkyl sulfuric acid stream
Implementation Method 2
neutralising the alkyl sulfuric acid stream to provide a concentrated surfactant blend
Data Source
AI summary
The need for processes for forming flowable concentrated anionic surfactant blends having reduced levels of dioxane by-product while avoiding malodour and discoloration, and providing good low temperature stability, and useful for creating detergent composition with high performance and sudsing, without requiring high levels of solvent, is met by first forming an alcohol stream comprising at least one alkyl glycol and at least one alkyl alcohol, and then sulfating and neutralizing the alcohol stream to form the concentrated anionic surfactant blend.