Recycled Refrigerant Composition: Distillation for Low-GWP R-454B Replacement
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Solution Overview
Problem
The widespread use of high Global Warming Potential (GWP) refrigerants like R-410A, R-32, and R-454B contributes significantly to the global warming crisis, and existing technologies for reclaiming complex refrigerant mixtures are inadequate, leading to their release into the atmosphere, despite the need for a phasedown mandated by regulations.
Innovation Solution
A refrigerant composition made from recycled difluoromethane (R-32) and pentafluoroethane (R-125) with a net zero GWP, formulated as a drop-in replacement for R-454B, utilizing a distillation process to refine reclaimed refrigerants and achieve equivalent performance with reduced flammability and GWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high GWP refrigerants like R-410A, R-32, and R-454B are used, then cooling performance is maintained, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by using recycled R-125 and R-32 in specific proportions (70-90 wt% R-125 and 10-30 wt% R-32) to create a refrigerant blend that maintains cooling performance while achieving net zero GWP through recycling
Solution Approach 2:
The patent recovers and reuses refrigerant components that would otherwise be discarded or vented, transforming waste refrigerant materials into a valuable net zero GWP refrigerant product through distillation and purification processes
2Loss of substance
If reclaimed refrigerants are released into the atmosphere, then loss of refrigerant material occurs, but harmful environmental effects increase
Solution Approach 1:
The patent converts the harmful act of venting reclaimed refrigerant into a beneficial process by capturing and recycling these materials into a net zero GWP refrigerant blend, transforming environmental harm into environmental benefit
Solution Approach 2:
Instead of discarding reclaimed refrigerant to the atmosphere, the patent recovers and purifies these materials through distillation to create a useful net zero GWP refrigerant product
3Ease of manufacture
If existing reclamation technologies are used for complex refrigerant mixtures, then processing simplicity is maintained, but reclamation effectiveness is inadequate
Solution Approach 1:
The patent segments the complex refrigerant mixture into distinct components (R-125 and R-32) through distillation, separating them into pure fractions that can be precisely recombined to achieve the target composition for net zero GWP refrigerant
4Object-generated harmful factors
If R-454B is used as a replacement, then GWP is reduced compared to R-410A, but flammability increases
Solution Approach 1:
The patent changes the compositional parameters by using a different ratio of HFC components (R-125 and R-32) compared to R-454B, achieving net zero GWP while maintaining flammability characteristics through careful formulation
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 solution effectively reduces the global warming potential by reusing reclaimed refrigerants, minimizing flammability, and maintaining performance characteristics, addressing the long-term goal of decarbonization without additional energy or material consumption.
Implementation Method 1
utilizing a distillation process to refine reclaimed refrigerants
Data Source
AI summary
A refrigerant composition is made up of approximately 72-74% difluoromethane, 7-8% pentafluoroethane, 1-3% carbon dioxide, and 17-19% 1,3,3,3-tetrafluoropropene. This mixture is formed from recycled difluoromethane and pentafluoroethane, which have a net global warming potential of 0. The method of preparing this refrigerant involves injecting a mixture of recovered refrigerants, including difluoromethane, pentafluoroethane, and chlorodifluoromethane, into the center of a distillation column. The top of the column yields a refrigerant composition of 90-92% difluoromethane and 8-10% pentafluoroethane. Chlorodifluoromethane is removed from the bottom of the column. This refrigerant composition is used to create a low global warming potential refrigerant that can be used as a drop-in replacement for R-454B.