Multi-Stage Fluorinated Olefin Production via Segmented Hydrogenation
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Solution Overview
Problem
Existing methods for producing fluorinated olefins are not effective or economical for large-scale commercial production, lacking high conversion rates and selectivity to the desired products.
Innovation Solution
A multi-stage process involving the hydrogenation of fluoropropene followed by dehydrofluorination, with effective catalyst usage and separation of HF, to produce fluorinated olefins like tetrafluoropropene with high conversion and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods for producing fluorinated olefins are used, then production can be carried out, but conversion rates and selectivity to desired products are not high
Solution Approach 1:
The patent divides the hydrogenation process into multiple sequential stages, each with a specific catalyst and operating conditions optimized for particular selectivity. Stage 1 uses Catalyst 1 for initial conversion, Stage 2 uses Catalyst 2 for intermediate conversion, and Stage 3 uses Catalyst 3 for final conversion, allowing each stage to be optimized for both conversion rate and selectivity to different程度的 hydrogenated products
Solution Approach 2:
Each reaction stage employs different catalysts with specific properties tailored to the local requirements of that stage. Catalyst 1 (e.g., Pd-based) is optimized for initial hydrogenation, Catalyst 2 (e.g., Ni-based) for intermediate conversion, and Catalyst 3 (e.g., Pt-based) for final conversion, creating local optimization throughout the process to achieve high overall conversion with high selectivity at each step
2Ease of manufacture
If existing methods are used, then fluorinated olefins can be produced, but the process is not economical for large-scale commercial production
Solution Approach 1:
The patent implements HF recovery and recycling systems where hydrogen fluoride byproduct is captured, purified, and fed back into the process. This reduces waste disposal costs and raw material consumption, significantly improving economic viability for large-scale production while maintaining high productivity through efficient resource utilization
Solution Approach 2:
The multi-stage continuous flow hydrogenation process allows uninterrupted production with optimized throughput. Reactants continuously flow through three staged reactors with different catalysts, maintaining steady-state operation that maximizes production efficiency while the integrated HF recovery system operates continuously to recycle materials, making the process economically viable for large-scale commercial application
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 achieves high conversion and selectivity rates for fluorinated olefins, such as tetrafluoropropene, with the option of HF recovery, enhancing the efficiency and economic viability of fluorinated olefin production.
Implementation Method 1
contacting a feed stream comprising a fluoropropene having from three to six fluorine substituents and hydrogen reactants with a first amount of catalyst to convert said reactants into a hydrofluoroalkane
Implementation Method 2
contacting said first exit stream with a second amount of catalyst to convert said unreacted fluoropropene into a hydrofluoroalkane
Implementation Method 3
dehydrohalogenating at least a portion of said hydrofluoroalkane from said contacting step (b) to produce a product stream comprising a fluorinated olefin and HF product
Data Source
Figure 1~2
AI summary
A process for the production of fluorinated olefins, preferably fluorinated propenes, by contacting a feed stream containing a fluorinated olefin and hydrogen with a first amount of catalyst to produce the hydrofluorocarbon, wherein a first exit stream contains unreacted fluorinated olefin and hydrogen; contacting the first exit stream with a second amount of catalyst to produce a hydrofluorocarbon, wherein the second amount of catalyst is preferably greater than the first amount of catalyst; and contacting the hydrofluorocarbon with a catalyst for dehydrohalogenation to produce a product stream of fluorinated olefin.