Stabilized HFO-1234yf Composition for Oligomerization Control
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Solution Overview
Problem
Fluoroolefins used as refrigerants can degrade and produce unwanted by-products under abnormal conditions, such as extreme temperatures or contact with contaminants, leading to oligomerization or homopolymerization, which is not effectively addressed by existing stabilization methods.
Innovation Solution
A composition comprising HFO-1234yf with an inhibitor, such as limonene or α-terpinene, that reduces the potential for oligomerization or homopolymerization by acting as a radical inhibitor, maintaining stability and refrigeration performance even in the presence of contaminants.
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 unwanted by-products
Solution Approach 1:
The patent introduces inhibitors (2,6-di-tert-butyl-4-methylphenol and 2,2,4-tri-tert-butyl-1,3,5-dimethylbenzene) as intermediary substances that mediate between the fluoroolefin and the abnormal conditions (oxygen, contaminants, extreme temperatures). These inhibitors act as radical scavengers that intercept free radicals before they can initiate oligomerization or degradation reactions, thereby protecting the fluoroolefin while maintaining refrigeration performance.
Solution Approach 2:
The patent applies preliminary anti-action by adding inhibitors to the fluoroolefin composition before the abnormal conditions occur. The inhibitors are pre-positioned in the system to counteract potential degradation and oligomerization reactions before they can take place, preventing the formation of unwanted by-products while the refrigerant performs its cooling function.
2Stability of the object's composition
If stabilizing inhibitors are added to prevent oligomerization, then composition stability improves, but the complexity of the composition increases
Solution Approach 1:
The patent optimizes the concentration parameters of the inhibitors to achieve effective stabilization with minimal addition. Specifically, 2,6-di-tert-butyl-4-methylphenol is added at 1-100 ppm and 2,2,4-tri-tert-butyl-1,3,5-dimethylbenzene at 1-50 ppm. By carefully controlling these parameter ranges, the patent achieves composition stability while keeping the complexity increase minimal through precise dosage rather than large additions.
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 stabilized composition effectively prevents the formation of oligomeric or homopolymeric products, ensuring the fluoroolefin's stability and refrigeration performance, making it suitable for use in cooling systems without compromising compatibility with refrigerant oil and parts.
Implementation Method 1
The inhibitor can function as a radical inhibitor and without affecting the refrigeration performance or compatibility of the composition with refrigerant oil and parts
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.