HCC-240aa/HF Azeotropic Composition for Non-Fractionating Fluorination
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Solution Overview
Problem
The industry seeks environmentally safe, non-fractionating mixtures for applications like heat transfer media and refrigerants, as the use of certain hydrofluorocarbons contributes to global warming, and azeotrope formation is unpredictable.
Innovation Solution
Development of azeotropic and azeotrope-like compositions comprising 1,1,2,2,3-pentachloropropane (HCC-240aa) and hydrogen fluoride (HF) with a boiling point of about 19°C at 14.7 psia, and methods for producing trifluorochloropropenes using these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrofluorocarbons are used as heat transfer media or refrigerants, then desirable properties for industrial applications are achieved, but contribution to global warming occurs
Solution Approach 1:
The patent changes the chemical composition parameters by replacing conventional hydrofluorocarbons with a specific mixture of 1,1,2,2,3-pentachloropropane and hydrogen fluoride in controlled proportions. This parameter change achieves both the desired industrial performance and reduced environmental harm by creating an azeotropic mixture with specific thermodynamic properties suitable for heat transfer and refrigeration applications
Solution Approach 2:
The patent creates a composite fluid system by combining 1,1,2,2,3-pentachloropropane and hydrogen fluoride in specific ratios to form an azeotropic mixture. This composite material approach allows the mixture to exhibit combined properties of both components, achieving desirable thermal performance while reducing global warming potential compared to single-component hydrofluorocarbons
2Object-affected harmful factors
If new HFC-based mixtures are sought as environmentally safer substitutes, then environmental safety is improved, but azeotrope formation becomes unpredictable and complicates identification
Solution Approach 1:
The patent applies preliminary action by pre-determining the specific composition ratios of 1,1,2,2,3-pentachloropropane and hydrogen fluoride that form stable azeotropic mixtures. Through prior research and development, the optimal proportions have been established beforehand, allowing practitioners to directly implement these predetermined formulations without encountering azeotrope formation unpredictability during application
3Reliability
If azeotropic compositions of HCC-240aa and HF are produced and separated, then non-fractionating mixtures suitable for industrial applications are obtained, but additional separation and recycling steps are required
Solution Approach 1:
The patent exploits phase transition properties, specifically the azeotropic boiling point behavior, to enable easy separation of the HCC-240aa and HF mixture. By controlling the phase transition at the characteristic azeotropic composition, the components can be separated and recycled through standard distillation equipment, making the additional process steps manageable and economically viable
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
Provides stable, non-fractionating mixtures suitable for industrial applications, reducing environmental impact while maintaining performance.
Implementation Method 1
azeotropic and azeotrope-like compositions consisting essentially of 1,1,2,2,3-pentachloropropane (HCC-240aa) and hydrogen fluoride (HF)... which do not substantially fractionate on boiling and evaporation
Implementation Method 2
the azeotrope or azeotrope-like composition has a boiling point of about 19° C. at a pressure of about 14.7 psia±0.2 psia
Implementation Method 3
fluorinating the 1,1,2,2,3-pentachloropropane (HCC-240aa) with hydrogen fluoride (HF) and a catalyst to produce a product mixture comprising trifluorochloropropenes
Implementation Method 4
fluorinating the 1,1,2,2,3-pentachloropropane (HCC-240aa) with hydrogen fluoride (HF) and a catalyst
Data Source
AI summary
Minimum-boiling, heterogeneous azeotropic and azeotrope-like compositions including 1,1,2,2,3-pentachloropropane (HCC-240aa) and hydrogen fluoride (HF), as well as methods for using these azeotropic or azeotrope-like compositions in the production of trifluorochloropropenes.