HFO-1225ye Azeotropic Composition for Stable Purification
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Solution Overview
Problem
Existing HFO-based compositions face challenges in identifying azeotrope formation, leading to fractionation upon boiling and evaporation, and there is a need for environmentally safer alternatives to CFCs, HFCs, and HCFCs that have minimal ozone depletion potential and contribute negligibly to greenhouse global warming.
Innovation Solution
Development of azeotropic and azeotrope-like compositions of 1,2,3,3,3-pentafluoropropene (HFO-1225ye) with water and halocarbon or hydrogen fluoride impurities, which form stable mixtures that do not fractionate upon boiling, allowing for efficient separation and purification of HFO-1225ye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO-based compositions are used as refrigerants or blowing agents, then environmentally safer alternatives to CFCs and HFCs are provided, but the compositions may fractionate upon boiling and evaporation
Solution Approach 1:
The patent combines HFO-1225ye with water and specific impurities (halocarbons or hydrogen fluoride) to form an azeotropic mixture. This merging of components creates a stable composition that does not fractionate upon boiling, resolving the contradiction between environmental safety and compositional stability.
Solution Approach 2:
The patent changes the compositional parameters by specifying precise ranges of water content (0.1-50 wt%) and impurity content, creating an azeotropic mixture with fixed boiling characteristics. This parameter optimization prevents fractionation while maintaining environmental benefits.
2Object-affected harmful factors
If HFO-1225ye is produced as an intermediate in HFO-1234yf production, then environmentally desirable products are obtained, but separation and purification becomes difficult
Solution Approach 1:
The patent uses water and specific impurities as intermediary substances that form an azeotropic mixture with HFO-1225ye. This intermediary approach facilitates separation and purification by creating distinct phase behaviors during distillation, making the purification process more manageable.
Solution Approach 2:
The patent exploits phase transition characteristics of the azeotropic mixture during distillation. The fixed boiling point and non-fractionating behavior of the azeotrope create distinct phase separation patterns that enable efficient separation and purification of HFO-1225ye from the mixture.
3Stability of the object's composition
If azeotropic mixtures are used to prevent fractionation, then composition stability is improved, but identification and characterization becomes difficult
Solution Approach 1:
The patent replaces complex analytical methods with simpler practical characterization approaches. By defining azeotropes through their boiling behavior and phase separation characteristics during distillation, the patent simplifies identification and measurement while maintaining the stability benefit.
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 compositions provide environmentally friendly alternatives with minimal ozone depletion and greenhouse gas contribution, suitable for uses such as refrigerants, blowing agents, and sterilization, while enabling efficient separation and purification of HFO-1225ye.
Implementation Method 1
HFO-1225ye is known to form an azeotropic mixture with water. Azeotropic mixtures are known to resist fractionation during boiling and evaporation.
Implementation Method 2
This azeotrope is separated from impurities using standard methods known in the art, such as but not limited to, distillation.
Data Source
AI summary
Provided are azeotropic and azeotrope-like compositions comprising 1,2,3,3,3-pentafluoropropene (HFO-1225ye), water and at least one impurity, wherein the impurity is halocarbon or hydrogen fluoride. Also provided are methods of purifying such azeotropic and azeotrope-like compositions in order to recover purified 1,2,3,3,3-pentafluoropropene.