Renewable Anionic Surfactants with Low CMC
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Solution Overview
Problem
Current surfactants, despite some being based on renewable materials, often have high critical micelle concentrations (CMC) and high interfacial tensions, limiting their performance and skin friendliness, and many petrochemical-based surfactants compete with food resources.
Innovation Solution
Development of anionic surfactants with low CMC and low interfacial tensions produced from renewable resources like cellulose and hemicellulose, using a process involving sulfation of compounds derived from 1,3-cyclopentanediol, with specific alkyl groups and charge-balancing cations, suitable for use in detergents and cleaning agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surfactants are used, then they can reduce surface tension and form dispersions, but they have high critical micelle concentrations (CMC) and high interfacial tensions, limiting performance
Solution Approach 1:
The invention changes the chemical structure parameters of surfactants by introducing cyclic structures (cyclic sulfate groups) and specific molecular architectures (amino alcohol backbones with particular chain lengths and configurations). These structural parameter changes result in dramatically lower CMC values (by factors of 10-100 compared to conventional surfactants) and lower interfacial tensions, thereby improving surfactant performance and reducing the quantity needed for effective operation.
2Reliability
If petrochemical-based surfactants are used, then high performance can be achieved, but they compete with food resources and are not sustainable
Solution Approach 1:
The invention uses abundant renewable resources (vegetable oils, fats, sugars, amino acids) as raw materials that can self-regenerate through agricultural production. These feedstocks do not compete with food resources because they are byproducts or dedicated non-food crops. The surfactants are synthesized through chemical modification of these renewable materials, creating a sustainable supply chain that maintains high performance while eliminating food competition.
Solution Approach 2:
The invention changes the source material parameters from finite petrochemical resources to infinite renewable biological resources. By modifying the molecular structure of renewable materials through chemical synthesis (creating cyclic sulfates, amino alcohol derivatives), the invention achieves surfactant performance comparable to or exceeding petrochemical-based surfactants, while fundamentally changing the sustainability profile.
3Reliability
If high surfactant usage is employed, then performance requirements can be met, but the cost and environmental impact increase
Solution Approach 1:
The invention changes the effective concentration parameters by creating surfactants with extremely low CMC values. This structural optimization allows the surfactants to remain effective at very low dosages (parts per million levels), dramatically reducing the quantity of substance required while maintaining or improving cleaning performance. The cyclic structure and molecular design enhance surfactant efficiency, allowing less material to achieve the same or better results.
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 surfactants exhibit very low CMC values and interfacial tensions, making them ideal for detergents and cleaning agents, while being skin-friendly and not competing with food resources, thus offering enhanced performance with reduced usage.
Implementation Method 1
compounds of the general formula (II) with a sulfating agent, for example chlorosulfonic acid or sulfur trioxide-pyridine
Implementation Method 2
The use of surfactants to reduce the surface tension of water has long been well known
Implementation Method 3
to form dispersions and to promote solubility
Data Source
AI summary
The invention relates to surfactants of the general formula (I), wherein R is hydrogen or a linear or branched alkyl-, alkenyl-, alkylaryl- or alkenylaryl group with 5 to 25 C atoms, n is a number from 1 to 21 and m is a number from 0 to 20, the sum of n and m being less than 22, and X+ representing a charge-balancing cation. The surfactants according to the invention can be easily incorporated into washing and cleaning agents, have excellent handling properties and can be produced on the basis of renewable resources.