Hydrohaloolefin Composition Stabilization Against Decomposition and Corrosion
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Solution Overview
Problem
Hydrohaloolefins, such as hydrofluoroolefins and hydrochlorofluoroolefins, face stability issues during storage, leading to decomposition and potential metal corrosion due to acid generation, necessitating further diversification of stabilization methods beyond existing solutions like HCFC-244ca and water addition.
Innovation Solution
A hydrohaloolefin composition incorporating 1,1,2,3-tetrafluorobutane and 2,4,4-tetrafluoro-1-butene, with 1,1,2,3-tetrafluorobutane content ranging from 0.001 to 0.1% and total content of both up to 0.4% by mass, as a stabilizing additive, enhancing the stability and reducing metal corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydrohaloolefin is used as a main component, then global warming potential is reduced, but stability during storage deteriorates leading to decomposition
Solution Approach 1:
The patent introduces 1,1,2,3-tetrafluorobutane as an intermediary substance that mediates between the hydrohaloolefin and decomposition products. This stabilizer acts as a buffer that prevents direct decomposition of the hydrohaloolefin, thereby maintaining stability without compromising the low global warming potential of the main component.
Solution Approach 2:
The patent changes the chemical composition parameters by adding specific fluorinated compounds (1,1,2,3-tetrafluorobutane and 2,4,4,4-tetrafluoro-1-butene) in controlled amounts. This parameter change transforms the system from an unstable pure hydrohaloolefin to a stable composition with enhanced storage properties while maintaining the original environmental benefits.
2Stability of the object's composition
If stabilizing compounds like HCFC-244ca or water are added, then stability during storage is improved, but technology diversification is limited
Solution Approach 1:
The patent employs fluorinated compounds that serve multiple functions: they act as stabilizers during storage, maintain compatibility with the hydrohaloolefin system, and preserve the low environmental impact properties. This multi-functionality allows the same additive strategy to address both stability and environmental concerns without limiting technological options.
Solution Approach 2:
The patent creates a composite composition by combining hydrohaloolefin with fluorinated stabilizing agents. This composite approach integrates multiple functional components that work synergistically to provide both stability and environmental benefits, thereby diversifying the technological solution beyond single-component systems.
3Stability of the object's composition
If hydrohaloolefin decomposes, then stability deteriorates, but acid generation causes metal corrosion
Solution Approach 1:
The patent applies preliminary anti-action by adding stabilizing compounds that prevent decomposition before it occurs. The 1,1,2,3-tetrafluorobutane and 2,4,4,4-tetrafluoro-1-butene act in advance to block the decomposition pathway, thereby preventing the formation of corrosive acids that would otherwise attack metals.
Solution Approach 2:
The patent converts the potential harm of decomposition into a benefit by using the stabilizing compounds to redirect the chemical behavior. Instead of allowing harmful decomposition and acid generation, the stabilizers guide the system toward stable configurations, transforming what would be a harmful process into a protective mechanism.
Data Source
AI summary
A hydrohaloolefin composition includes a hydrohaloolefin as a main component, further includes 1,1,2,3-tetrafluorobutane, in which a content of the 1,1,2,3-tetrafluorobutane is 0.001 to 0.1% by mass with respect to a total amount of organic compounds.