Stabilized Fluoroolefin Composition Against Refrigerant Polymerization
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Solution Overview
Problem
Fluoroolefins used as refrigerants can degrade and form unwanted oligomers or homopolymers under abnormal conditions, such as extreme temperatures or contact with contaminants, leading to instability and performance issues in refrigeration systems.
Innovation Solution
Incorporating inhibitors like limonene, α-terpinene, or α-tocopherol into fluoroolefin compositions to reduce oligomerization and homopolymerization, effectively preventing interactions with initiators such as oxygen and fluoroolefin polyperoxides, thereby stabilizing the refrigerant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoroolefins are used as refrigerants under abnormal conditions, then refrigeration performance is maintained, but degradation and oligomerization occur leading to instability
Solution Approach 1:
The patent introduces inhibitor compounds (such as phenolic antioxidants, amine-based inhibitors, or sulfur-containing compounds) as intermediary substances that mediate between the fluoroolefin and the initiators of oligomerization. These inhibitors preferentially react with radical species or peroxides to prevent them from initiating polymerization of the fluoroolefin, thereby stabilizing the composition without affecting its refrigeration performance
Solution Approach 2:
The patent applies preliminary anti-action by adding inhibitors to the fluoroolefin composition before any degradation or oligomerization can occur. The inhibitors are pre-positioned in the system to neutralize potential initiators (such as oxygen, moisture, or metal ion contaminants) before they can trigger harmful polymerization reactions, thus preventing instability before it manifests
2Reliability
If inhibitors are added to prevent oligomerization, then stability is improved, but composition complexity increases
Solution Approach 1:
The patent optimizes the concentration parameters of inhibitor compounds to achieve effective stabilization at very low levels (typically 1-100 ppm). By carefully controlling the amount of inhibitor added, the patent maintains system stability while minimizing the impact on the overall composition and avoiding excessive complexity in the refrigerant formulation
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 inhibitors significantly enhances the stability of fluoroolefin compositions, preventing polymer formation and maintaining refrigeration performance even under abnormal conditions, thus offering a stable alternative to traditional refrigerants with higher global warming potential.
Implementation Method 1
the at least one fluoroolefin comprises at least one selected from the group consisting of HFO-1234yf and HFO-1234ze, and wherein the composition has been exposed to at least one of air, oxygen, cumene hydroperoxide, and fluoroolefin polyperoxides, peroxides, hydroperoxides, persulfates, percarbonates, perborates and hydropersulfates before said contacting
Data Source
AI summary
The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of at least one inhibitor. 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.