Firefighting Foam Using Deep Eutectic Solvents
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Solution Overview
Problem
Conventional firefighting foams contain perfluorinated surfactants that pose environmental hazards due to their persistence and toxicity, leading to a need for alternative, non-toxic, and non-flammable solvents that can stabilize foams and reduce fluorinated product discharge during testing, while maintaining performance criteria such as stability, spreading ability, and burn back resistance.
Innovation Solution
Development of firefighting foam compositions using deep eutectic solvents, which are mixtures of compounds with lower melting points than their individual components, incorporating natural ingredients like sugars, amino acids, and quaternary ammonium salts, that promote solubility of biopolymers and act as environmentally friendly alternatives in existing foam compositions or as surrogate foams for testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfluorinated surfactants are used in firefighting foams, then burn back resistance and spreading ability are improved, but environmental persistence and toxicity increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing perfluorinated surfactants with fluorine-free alternatives combined with deep eutectic solvents. This substitution maintains the foam's burn back resistance and spreading ability while eliminating the environmental persistence and toxicity associated with perfluorinated compounds.
Solution Approach 2:
The invention creates a composite firefighting foam system combining deep eutectic solvents (formed from hydrogen bond donors and acceptors) with fluorine-free surfactants. This composite approach achieves the performance characteristics of perfluorinated foams while avoiding their environmental harm.
2Productivity
If perfluorinated surfactants are used in firefighting foams, then foaming ability and surface tension reduction are improved, but acute toxicity and environmental accumulation increase
Solution Approach 1:
The patent modifies the chemical parameters by eliminating perfluorinated surfactants and introducing deep eutectic solvents with fluorine-free alternatives. This change preserves the low surface tension and high foaming ability while reducing acute toxicity and preventing environmental accumulation.
3Stability of the object's composition
If polysaccharide loadings are increased to offset decreased performance without perfluorinated surfactants, then foam stability is improved, but foam separation and hazards increase
Solution Approach 1:
The patent introduces deep eutectic solvents as intermediary substances that mediate between the polysaccharides and the fluorine-free surfactants. These solvents enhance foam stability through hydrogen bonding networks while preventing the separation and hazards associated with high polysaccharide loadings.
Solution Approach 2:
The invention creates a composite system where deep eutectic solvents work synergistically with moderate polysaccharide loadings and fluorine-free surfactants. This composite approach achieves foam stability without the excessive polysaccharide content that causes separation and hazards.
4Reliability
If conventional petroleum-based solvents and polymers are used in firefighting foams, then foam performance is maintained, but environmental damage and toxicity increase
Solution Approach 1:
The patent fundamentally changes the solvent and polymer parameters by replacing petroleum-based components with deep eutectic solvents formed from naturally occurring substances. This substitution maintains foam performance while eliminating environmental damage and toxicity.
Solution Approach 2:
The invention adopts biodegradable deep eutectic solvents that can break down naturally after use, replacing persistent petroleum-based solvents. These environmentally friendly solvents maintain performance during use but decompose harmlessly afterward, reducing long-term environmental damage.
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 deep eutectic solvent-based firefighting foams demonstrate excellent solubilizing properties, stability, and environmental sustainability, reducing the environmental impact of fluorinated surfactants and enabling effective fire suppression with reduced waste and toxicity during testing.
Implementation Method 1
The deep eutectic solvents may include a hydrogen bond donor and a hydrogen bond acceptor
Data Source
AI summary
The disclosed invention relates to novel biocompatible firefighting foam compositions that include a deep eutectic solvent. Disclosed are methods of making and using firefighting foams containing deep eutectic solvents, which may also be used in existing fire foam compositions as drop in solvent additives. The deep eutectic solvents may also be used in or as a principle component of surrogate firefighting foam compositions.