High-Purity Fluoroolefin Compositions Through Oxygen Removal
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Solution Overview
Problem
Existing fluoroolefin compositions, such as HFO-1234yf, are prone to oligomerization and homopolymerization in the presence of oxygen, leading to reduced purity and stability during storage and use, and existing inhibitors used to prevent this often reduce the purity of the refrigerant.
Innovation Solution
The use of reduced metal oxides, such as Cu, Ti, V, Mn, Fe, Co, Zn, Ni, and Pd, to remove oxygen and oxidizing compounds from fluoroolefin compositions without cleaving the C—F bond, combined with absorbents like silica gel or molecular sieves to eliminate inhibitors and their oxidation products, ensuring high purity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inhibitors are added to prevent oligomerization and homopolymerization, then stability is improved, but purity deteriorates
Solution Approach 1:
The patent applies preliminary action by removing oxygen and oxidizing compounds from the fluoroolefin composition before storage or use. This preventive approach eliminates the root cause of oligomerization and homopolymerization, making the addition of inhibitors unnecessary and thus preserving the high purity of the refrigerant composition.
2Ease of manufacture
If oxygen is present in fluoroolefin compositions, then ease of manufacture is improved, but stability deteriorates
Solution Approach 1:
The patent applies the extraction principle by specifically removing oxygen and oxidizing compounds from the fluoroolefin composition through purification processes. This selective removal of the harmful substance (oxygen) maintains ease of manufacture while dramatically improving stability, preventing oligomerization and homopolymerization during storage and use.
3Manufacturing precision
If absorbents are used to remove inhibitors, then purity is improved, but loss of substance increases
Solution Approach 1:
The patent applies the intermediary principle by using absorbent materials as mediators to selectively capture and remove inhibitor substances and their oxidation products from the fluoroolefin composition. This allows for high-purity refrigerant production while minimizing loss of the valuable fluoroolefin components, as the absorbents specifically target the harmful impurities.
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 method effectively reduces oxygen levels to below 10 ppm, maintaining the stability and purity of fluoroolefin compositions, preventing oligomerization and homopolymerization, and ensuring high-quality refrigerant performance.
Implementation Method 1
The use of reduced metal oxides, such as Cu, Ti, V, Mn, Fe, Co, Zn, Ni, and Pd, to remove oxygen and oxidizing compounds from fluoroolefin compositions
Implementation Method 2
combined with absorbents like silica gel or molecular sieves to eliminate inhibitors and their oxidation products
Data Source
AI summary
The present invention relates methods of producing, blending, charging, replacing, and packaging fluoroolefin-containing compositions free of oxygen and oxidizing components and/or free of oligomer inhibitors and/or moisture.