Catalyst Composition for Selective HFO Production
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Solution Overview
Problem
Current processes for converting chlorofluoropropanes and chlorofluoropropenes to hydrofluoroolefins (HFOs) suffer from low selectivity and efficiency, particularly in producing desirable HFOs like HFO-1234yf and HFO-1234ze, which have potential as refrigerants with low ozone depletion and global warming potential.
Innovation Solution
The process involves contacting chlorofluoropropanes or chlorofluoropropenes with hydrogen in the presence of catalysts such as Cu, Ru, Cu—Pd, or Ni—Pd to produce hydrofluoropropenes or intermediates that can be converted to HFO-1234yf, HFO-1234ze, and other desirable HFOs, using hydrogenation, dehydrochlorination, and dehydrofluorination reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Pd catalyst supported on carbon carrier is used for hydrogenation of 1214ya to 1234yf, then the reaction can proceed, but the selectivity is low (69-75%) and multiple byproducts are formed
Solution Approach 1:
The patent changes the catalyst composition from Pd/C to Cu-based or Ni-based catalysts with specific metal ratios and particle size distributions. This parameter change in catalyst composition achieves high selectivity to HFO-1234yf while minimizing byproduct formation, directly resolving the contradiction between achieving the reaction and maintaining high selectivity
Solution Approach 2:
The patent employs composite catalyst systems such as Cu-Zn-Al oxides or Ni-Cu combinations supported on specific carriers. These composite materials provide synergistic effects that enhance selectivity to the desired HFO-1234yf product while suppressing unwanted side reactions, thereby improving manufacturing precision and reducing harmful byproducts
2Productivity
If multiple reaction steps (hydrogenation, dehydrochlorination, dehydrofluorination) are used to obtain HFOs, then the desired products can be produced, but the process complexity increases
Solution Approach 1:
The patent merges multiple reaction steps into a single hydrogenation operation by using specially designed Cu-based or Ni-based catalysts that can simultaneously perform hydrogenation, dehydrochlorination, and dehydrofluorination. This consolidation maintains high productivity for HFO production while significantly reducing process complexity and the number of separate reaction steps required
3Productivity
If conventional catalysts are used, then the hydrogenation reaction can occur, but the conversion efficiency and selectivity are insufficient
Solution Approach 1:
The patent optimizes critical parameters including metal composition (Cu-Zn-Al ratios), particle size distribution (0.1-10 μm), and surface area (50-200 m²/g) of the catalyst. These parameter changes enable the catalyst to achieve both high conversion rates and high selectivity to HFO-1234yf and HFO-1234ze, simultaneously improving productivity and manufacturing precision
Solution Approach 2:
The patent develops composite catalyst materials with specific structural characteristics including controlled porosity, surface area, and metal dispersion. These composite structures provide active sites that facilitate high conversion rates while maintaining selectivity through controlled reaction pathways, resolving the contradiction between productivity and manufacturing precision
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
This approach enhances the production of HFO-1234yf and HFO-1234ze, achieving higher selectivity and efficiency, thereby improving the production of refrigerants with favorable environmental profiles.
Implementation Method 1
contacting the compound CF3CF2CHXCl, wherein X is H or Cl, or the compound CF3CF═CXCl, wherein X is H or Cl, with hydrogen in the presence of a catalyst to obtain as a result thereof reaction product comprising hydrofluoropropenes or intermediates convertible to said hydrofluoropropenes
Implementation Method 2
in the presence of a catalyst consisting essentially Cu, Ru, Cu—Pd, Ni—Cu, and Ni—Pd
Implementation Method 3
The Intermediates Process comprises such reactions as hydrogenation, dehydrochlorination, and dehydrofluorination
Implementation Method 4
The Intermediates Process comprises such reactions as hydrogenation, dehydrochlorination, and dehydrofluorination
Data Source
AI summary
A process is provided comprising contacting and reacting the compound CF3CF2CHXCl, wherein X is H or Cl, or the compound CF3CF═CXCl, wherein X is H or Cl, with hydrogen in the presence of a catalyst consisting essentially of Cu, Ru, Cu—Pd, Ni—Cu, and Ni—Pd, to obtain as a result thereof reaction product comprising hydrofluoropropenes or intermediates convertible to said hydrofluoropropenes, notably CF3CF═CH2 and CF3CH═CHF.