Pyrolysis Process for HFC-1234yf and HFC-1234ze Production
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Solution Overview
Problem
There is a need for new manufacturing processes for the production of hydrofluorocarbon refrigerants HFC-1234yf and HFC-1234ze, which have zero ozone depletion and low global warming potential, as existing methods are not sufficient.
Innovation Solution
A pyrolysis process is used to convert 1,1,1,2,3-pentafluoropropane (HFC-245eb) into HFC-1234yf and HFC-1234ze, involving a reactor with specific materials and conditions, including a temperature range of 450°C to 900°C and the absence of catalysts, to produce predominantly these refrigerants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If catalytic vapor phase dehydrofluorination is used to produce HFC-1234yf and HFC-1234ze, then the refrigerants can be produced with zero ozone depletion potential, but the process requires separate production lines and catalysts for each isomer
Solution Approach 1:
The patent combines the production of HFC-1234yf and HFC-1234ze into a single pyrolysis process using one reactor system, eliminating the need for separate production lines and different catalysts. The unified process uses thermal energy alone to convert HFC-245eb into both refrigerant isomers simultaneously.
2Productivity
If pyrolysis process is used to convert HFC-245eb, then both HFC-1234yf and HFC-1234ze can be produced in a single process, but high temperature conditions are required
Solution Approach 1:
The patent optimizes the pyrolysis temperature range (450°C to 900°C) and residence time parameters to achieve high conversion efficiency. By carefully controlling these thermal parameters, the process achieves greater than 50% single-pass conversion while managing the high temperature requirements through efficient heat transfer design.
3Productivity
If single-pass conversion is increased to greater than 50%, then production efficiency improves, but unconverted HFC-245eb requires recovery and recycling systems
Solution Approach 1:
The patent implements a recovery and recycling system for unconverted HFC-245eb. The process separates and recovers unreacted feedstock for reuse, while also utilizing azeotrope separation to purify the final refrigerant products. This approach maximizes material utilization and reduces waste.
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 process effectively produces predominantly HFC-1234yf and HFC-1234ze, with greater than 50% single-pass conversion, allowing for efficient recovery and recycling of unconverted HFC-245eb, and enables the production of pure refrigerants through azeotrope separation.
Implementation Method 1
A pyrolysis process is used to convert 1,1,1,2,3-pentafluoropropane (HFC-245eb) into HFC-1234yf and HFC-1234ze
Implementation Method 2
enables the production of pure refrigerants through azeotrope separation
Data Source
AI summary
A process is disclosed for producing 2,3,3,3-tetrafluoropropene and 1,3,3,3-tetrafluoropropene. The process involves pyrolyzing 1,1,1,2,3-pentafluoropropane.