Low Hydrogen Ionic Liquid Cooling Medium for High Temperature Safety
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Solution Overview
Problem
Ionic liquid cooling media form flammable or non-flammable gaseous decomposition products when heated above their thermal decomposition point, leading to increased pressure and potential hazards in closed systems, especially in high-temperature environments.
Innovation Solution
Using ionic liquids with a hydrogen content of 0% to 8.5% by weight, which significantly reduces sputtering and explosive reaction behavior, thereby minimizing the formation of hazardous gaseous products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ionic liquids are used as cooling media in high temperature environments, then safety is improved due to non-flammability below decomposition point, but hazardous gaseous decomposition products are formed when heated above thermal decomposition point
Solution Approach 1:
The patent changes the chemical composition parameters of the ionic liquid by selecting cations and anions with specific properties (e.g., imidazolium, pyridinium, pyrrolidinium cations with sulfate, phosphate, halide, fluorinated anions) to achieve low hydrogen content and high thermal stability, thereby preventing formation of flammable gaseous decomposition products at elevated temperatures
Solution Approach 2:
The patent creates composite ionic liquid formulations combining specific cation-anion pairs that exhibit synergistic effects, where the composite structure provides both thermal stability and resistance to forming hazardous decomposition products, overcoming the limitations of individual ionic liquid components
2Temperature
If ionic liquids are heated above thermal decomposition point, then cooling capability is maintained, but pressure increase and explosive reactions occur due to gaseous decomposition products
Solution Approach 1:
The patent modifies the thermal decomposition parameters of the ionic liquid by selecting chemically stable cation-anion combinations that resist decomposition even at temperatures above 100°C, thereby maintaining liquid phase stability and preventing pressure buildup from gaseous decomposition products in closed cooling systems
3Ease of operation
If conventional molecular liquids are used for cooling, then ease of operation is good, but flammability hazard exists at temperatures below thermal decomposition point
Solution Approach 1:
The patent creates an inert cooling environment by using ionic liquids that do not form flammable vapor atmospheres during cooling operations, replacing conventional molecular liquids with ionic compounds that maintain chemical stability and non-flammability across the operating temperature range
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 low hydrogen content ionic liquids exhibit reduced reactivity and flame volume, making them safer for use in high-temperature environments, preventing destructive explosions and ensuring safer operation in technical devices and industrial processes.
Implementation Method 1
In combustion experiments it can be seen, that a typical ionic liquid starts to burn after the bulk phase has reached the flashpoint temperature and that in many cases the combustion only continues, if a quite high input of external heat from a heat source is given.
Implementation Method 2
When heated up above their thermal decomposition temperature, however, they form gaseous, molecular decomposition products, which are flammable.
Data Source
AI summary
Cooling medium comprising an ionic liquid with a hydrogen content of 0% to 8.5% by weight and its use.