Concentrated Surfactant Blends With Low 1,4-Dioxane and Flowability
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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, formed through a specific alcohol stream with controlled ethylene glycol distribution, followed by sulfation and neutralization, to create a concentrated surfactant blend with reduced alkoxylation and minimal solvent use.
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 controlled ethylene glycol units (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-doxane by-product formation, as the specific glycol structure limits the formation pathways for harmful by-products
Solution Approach 2:
The patent creates a composite surfactant system by blending alkyl glycol sulfates with controlled amounts of alkyl sulfates and alkyl alkoxylated sulfates. This composite approach allows optimization of multiple properties simultaneously: the alkyl glycol sulfates provide low viscosity and reduced dioxane formation, while the other surfactants contribute to sudsing and cleaning performance
2Object-affected harmful factors
If concentrated surfactant blends are made without solvents to improve environmental sustainability, then environmental profile is improved, but viscosity becomes too high for efficient processing
Solution Approach 1:
The patent changes the molecular structure parameters of the surfactant by using alkyl glycol sulfates with specific ethylene glycol unit lengths (n=1-3). This structural modification inherently reduces the blend viscosity compared to traditional surfactants, enabling high-concentration formulations without requiring solvent additives, thus maintaining both environmental sustainability and production efficiency
3Ease of operation
If higher temperatures are used during sulfation to reduce viscosity, then flowability is improved, but residual 1,4-dioxane increases
Solution Approach 1:
The patent changes the chemical composition parameter by using alkyl glycol sulfates with controlled ethylene glycol distribution instead of traditional alkyl alcohols. This compositional change reduces the blend viscosity inherently, allowing adequate flowability at lower sulfation temperatures, thereby preventing the formation of excessive 1,4-dioxane residues that would occur at higher temperatures
4Object-generated harmful factors
If alkyl glycol sulfates with narrow ethylene glycol distribution are used to reduce 1,4-dioxane, then by-product formation is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the molecular architecture by using alkyl glycol sulfates with a controlled narrow distribution of ethylene glycol units (n=1-3, with 90% having n=1). This specific structural parameter change inherently limits the formation of 1,4-doxane by-products while maintaining acceptable manufacturing feasibility through established glycol synthesis and sulfation processes
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 more flowable surfactant blend with reduced 1,4-dioxane formation, lower Krafft point for enhanced solubility, and improved low-temperature stability, allowing for efficient detergent formulation with minimal solvent content.
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.