Fluoroolefin Stabilizer Composition Against Heat and Oxidation
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Solution Overview
Problem
Fluoroolefins used as working fluids in refrigeration and air-conditioning systems degrade due to instability at high temperatures and oxidation by air, limiting their practical application.
Innovation Solution
Incorporating specific stabilizers such as ascorbic acid, terephthalate, or nitromethane into fluoroolefin compositions to enhance stability and prevent degradation caused by temperature extremes and oxygen exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoroolefins are used as working fluids in refrigeration and air-conditioning systems, then low global warming potential and excellent refrigeration performance are achieved, but degradation occurs due to instability at high temperatures and oxidation by air
Solution Approach 1:
The patent introduces stabilizers (ascorbic acid, terephthalate, or nitromethane) as intermediary substances that protect fluoroolefins from degradation. These stabilizers act as mediators between the fluoroolefins and harmful factors (high temperature and oxygen), preventing direct harmful interactions and thus resolving the contradiction between maintaining reliability and avoiding degradation.
Solution Approach 2:
The stabilizers create a protective chemical environment around the fluoroolefins, effectively creating an 'inert' chemical atmosphere that prevents oxidation and thermal degradation. This chemical protection layer isolates the fluoroolefins from reactive oxygen and extreme temperature conditions, allowing the system to maintain reliability without degradation.
2Reliability
If stabilizers are added to fluoroolefins to prevent degradation, then stability and reliability are improved, but device complexity increases
Solution Approach 1:
The patent modifies the chemical composition parameters of the fluoroolefin system by adding small amounts of specific stabilizer compounds. This parameter change (adding stabilizers) directly improves reliability by preventing degradation, while the controlled addition of specific compounds keeps the complexity increase manageable and justified by the performance improvement.
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 addition of these stabilizers significantly reduces degradation, maintaining the refrigeration performance and stability of fluoroolefin-based working fluids in refrigeration and air-conditioning systems.
Implementation Method 1
the degradation may be caused by oxidation in the presence of air that has inadvertently leaked into the system
Data Source
AI summary
The present disclosure relates to compositions comprising at least one fluoroolefin and an effective amount of a stabilizer comprising at least one ascorbic acid, terephthalate, or nitromethane, or mixtures thereof. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.