Azeotropic HFO-HFE Blowing Agent Compositions
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Solution Overview
Problem
There is a need for compositions that do not contribute to stratospheric ozone depletion and have low global warming potentials, replacing ozone-depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs, while also maintaining stability in applications such as refrigeration and foam expansion agents.
Innovation Solution
Azeotropic or azeotrope-like compositions consisting of Z-1,1,1,4,4,4-hexafluoro-2-butene and methyl perfluoropropyl ether, which form stable mixtures with Z-HFO-1336mzz, ensuring consistent boiling points and preventing fractionation, thus maintaining performance and safety in various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydrofluorocarbons (HFCs) are used to replace CFCs and HCFCs, then ozone depletion is prevented, but global warming potential increases
Solution Approach 1:
The patent changes the chemical composition parameters by using specific ratios of HFO-1336mzz (containing 1,1,1,4,4,4-hexafluoro-2-butene) combined with HFE-7000 (methyl perfluoropropyl ether) to achieve both low ozone depletion potential and low global warming potential, moving away from conventional HFC compositions
Solution Approach 2:
The patent creates a composite refrigerant composition by combining HFO-1336mzz and HFE-7000 in specific ratios (where HFE-7000 is present in an effective amount to form an azeotropic or azeotrope-like mixture), achieving properties that neither component alone could provide, specifically low GWP and ozone safety
2Adaptability or versatility
If non-azeotropic mixtures are used, then composition flexibility is improved, but fractionation occurs during phase change leading to performance degradation
Solution Approach 1:
The patent converts the potential harm of composition change during phase change into a benefit by deliberately formulating an azeotropic or azeotrope-like mixture where the composition remains stable, ensuring that the refrigerant maintains consistent performance throughout evaporation and condensation cycles
Solution Approach 2:
The patent adjusts the compositional parameters to achieve azeotropic or azeotrope-like behavior, where the specific ratio of HFO-1336mzz to HFE-7000 ensures that the vapor and liquid phases have the same composition, preventing fractionation
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 azeotropic or azeotrope-like compositions provide a stable and non-depleting alternative, maintaining performance in refrigeration and foam expansion applications while minimizing environmental impact by preventing ozone depletion and reducing global warming potential.
Implementation Method 1
methyl perfluoropropyl ether is present in an effective amount to form an azeotropic or azeotrope-like mixture with Z-HFO-1336mzz
Data Source
AI summary
Disclosed are azeotropic or azeotrope-like compositions containing Z-1,1,1,4,4,4-hexafluoro-2-butene and methyl perfluoropropyl ether. Also disclosed is process of using the azeotropic or azeotrope-like composition as blowing agents for preparing a thermoplastic or thermoset foam. Also disclosed is a process of using the azeotropic or azeotrope-like composition as a refrigerant for producing cooling or heating. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as solvents. Also disclosed is a process of using the azeotropic or azeotrope-like composition as propellants for producing an aerosol. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as heat transfer media. Also disclosed is a process of extinguishing or suppressing a fire by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as dielectrics.