1233xf Compositions for Selective Low-GWP Refrigerant Production
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Solution Overview
Problem
Hydrofluorocarbons (HFCs) used as refrigerants and heat transfer fluids have a high global warming potential (GWP) and can damage the ozone layer, while hydrofluoro-olefins, despite being more environmentally friendly, have a short atmospheric lifespan due to their reactive olefin bond.
Innovation Solution
Compositions comprising 2-chloro-3,3,3-trifluoropropene (1233xf) and other related compounds are used as intermediates to produce low GWP refrigerants and heat transfer fluids, utilizing dehydrochlorination and fluorination processes to enhance selectivity and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrofluorocarbons (HFCs) are used as refrigerants and heat transfer fluids, then effective refrigeration and heat transfer performance is achieved, but global warming potential increases and ozone layer damage occurs
Solution Approach 1:
The patent changes the chemical composition parameters by using hydrofluoro-olefins with specific molecular structures (containing olefin bonds) instead of conventional HFCs, achieving both effective refrigeration performance and reduced global warming potential. The specific composition of 2-chloro-3,3,3-trifluoropropene and related compounds provides the desired environmental properties while maintaining functional performance.
Solution Approach 2:
The patent employs compounds with short atmospheric lifetimes (hydrofluoro-olefins) that rapidly decompose in the atmosphere, preventing long-term accumulation and reducing global warming impact. The short lifespan of these compounds (compared to conventional HFCs) means they do not persist in the atmosphere to cause prolonged environmental harm, while still providing effective refrigeration during their operational use.
2Object-affected harmful factors
If hydrofluoro-olefins are used as refrigerants, then global warming potential is reduced, but atmospheric lifespan decreases due to reactive olefin bond
Solution Approach 1:
The patent deliberately selects hydrofluoro-olefins with short atmospheric lifetimes as the refrigerant composition. The reactive olefin bond is intentionally used to create compounds that rapidly decompose in the atmosphere, ensuring they do not persist long enough to cause significant global warming, while still providing effective refrigeration performance during their operational service life.
Solution Approach 2:
The patent converts the reactive nature of the olefin bond, which would normally be considered a stability disadvantage, into a benefit by ensuring rapid atmospheric decomposition. This rapid decomposition prevents long-term environmental accumulation and reduces global warming potential, transforming what could be seen as a weakness into an environmental advantage.
3Object-affected harmful factors
If 2-chloro-3,3,3-trifluoropropene compositions are used as intermediates, then production of low GWP refrigerants is enabled, but manufacturing process complexity increases
Solution Approach 1:
The patent uses 2-chloro-3,3,3-trifluoropropene and related compounds as intermediate products that can be readily synthesized from commercially available starting materials. The intermediate compounds are designed to be easily produced through standard chemical reactions, allowing the manufacturing process to proceed in straightforward steps without requiring complex multi-step syntheses or specialized equipment.
Solution Approach 2:
The patent employs 2-chloro-3,3,3-trifluoropropene compositions as intermediate substances that facilitate the production of final low GWP refrigerant products. These intermediates serve as convenient, easily obtainable starting points that can be converted to the desired final products through relatively simple chemical transformations, avoiding the need for complex direct synthesis routes.
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 low GWP refrigerants and heat transfer fluids with improved stability and efficiency, suitable for various applications including refrigeration systems and as intermediates for further hydrofluorocarbon compounds.
Implementation Method 1
contacting 2,3-dichloro-1,1,1-trifluoropropane (243db), in the liquid phase, with a base to effect dehydrochlorination to form 2-chloro-3,3,3-trifluoropropene (1233xf)
Implementation Method 2
Compositions disclosed herein can be used as an intermediate to produce 1234yf which can be used as low GWP refrigerant, heat transfer media, blowing agent, or solvent
Data Source
AI summary
A composition including 2-chloro-3,3,3-trifluoropropene (1233xf), one or more of 2,3-dichloro-1,1,1-trifluoropropane (243db), 1,2-dichloro-3,3,3-trifluoropropene (1223xd), 2,3-dichloro-3,3-difluoropropene (1232xf), 2,2,3-trichloro-1,1,1-trifluoro-propane (233ab), 2,3,3-trichloro-1,1,1-trifluoro-propane (233da), 3,3,3-trifluoropropyne, 1-chloro-3,3,3-trifluoropropyne, 3,3,3-trifluoro-1-propene (1243zf), 1-chloro-3,3,3-trifluoro- 1-propene (1233zd), 1-chloro-2,3,3,3-tetrafluoro-1-propene (1224yd), or 2-bromo-3,3,3-trifluoropropene and optionally 1233xf oligomers are disclosed.