Continuous Catalytic Production of Fluorinated Cyclobutane
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Solution Overview
Problem
Current methods for producing 1,1,2-trifluoro-2-(trifluoromethyl)cyclobutane (TFMCB) are not cost-effective and amenable to large-scale commercial production, with existing processes suffering from low atom efficiency, complex mixtures, and undesirable by-products due to high temperatures and excess reactant ratios.
Innovation Solution
A continuous catalytic process involving the reaction of hexafluoropropene and ethylene in the presence of a metal catalyst and oligomerization/polymerization inhibitors, with controlled reaction conditions to enhance conversion and selectivity, followed by recycling unreacted materials, and pyrolysis of TFMCB to produce hydrofluoroolefin 1234yf and vinylidene fluoride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal dimerization is conducted at high temperatures (200-600°C) for extended periods (4-1000 hours) as described in the prior patent, then the cyclodimerization reaction can proceed, but the process produces complex mixtures with unwanted by-products and poor selectivity
Solution Approach 1:
The patent changes the reaction parameters by conducting the cyclodimerization at moderate temperatures (50-150°C) rather than high temperatures (200-600°C), and uses a catalyst to enable the reaction to proceed under these milder conditions. This parameter change resolves the contradiction by achieving acceptable reaction rates without producing complex mixtures and unwanted by-products
Solution Approach 2:
The patent introduces a catalyst as an intermediary substance to facilitate the cyclodimerization reaction. The catalyst enables the reaction to proceed at moderate temperatures with high selectivity, avoiding the formation of complex mixtures that occur in uncatalyzed high-temperature processes
2Productivity
If excess ethylene is used to drive the cyclodimerization reaction, then conversion of HFP can be improved, but the formation of unwanted oligomers and complex mixtures increases
Solution Approach 1:
The catalyst acts as an intermediary that selectively facilitates the desired cyclodimerization reaction between HFP and ethylene while preventing unwanted oligomerization of ethylene. This allows the process to achieve high HFP conversion even with controlled ethylene ratios without forming harmful by-products
Solution Approach 2:
The patent changes the reaction conditions by using a catalyst system that enables high conversion at moderate temperatures and controlled ethylene ratios, preventing the formation of unwanted oligomers that occur in uncatalyzed processes with excess ethylene
3Productivity
If thermal cracking is conducted at high temperatures (500-1000°C) to produce HFO-1234yf from TFMCB, then the desired product can be formed, but olefin oligomerization and complex side reactions occur
Solution Approach 1:
The patent changes the cracking temperature parameter from high temperatures (500-1000°C) to moderate temperatures (700-850°C), and introduces a catalyst to enable the cracking reaction to proceed selectively under these milder conditions, thereby avoiding olefin oligomerization and complex side reactions while maintaining high productivity
4Manufacturing precision
If multiple reaction steps and purification operations are used to produce HFO-1234yf, then the desired product can be obtained, but the atom efficiency decreases and the process becomes less cost-effective
Solution Approach 1:
The patent merges the cyclodimerization and cracking reactions into a one-pot continuous process, eliminating intermediate isolation and purification steps. This combining of operations maintains high selectivity while improving atom efficiency by reducing material losses during transfer and purification operations
Solution Approach 2:
The patent implements a continuous process where the cyclodimerization and cracking reactions occur sequentially in a continuous flow system. This continuity eliminates batch processing interruptions and purification steps, maintaining high selectivity while improving atom efficiency through continuous operation
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 method achieves high yields and selectivity of TFMCB with improved purity and efficiency, allowing for the production of valuable compounds like hydrofluoroolefin 1234yf and vinylidene fluoride with enhanced atom efficiency and reduced by-product formation.
Implementation Method 1
reacting the hexafluoropropene and ethylene in the reaction vessel in the presence of at least one metal catalyst
Implementation Method 2
reacting the hexafluoropropene and ethylene in the presence of at least one oligomerization/polymerization inhibitor
Implementation Method 3
pyrolysis of TFMCB to produce hydrofluoroolefin 1234yf and vinylidene fluoride
Data Source
Figure 1~2
AI summary
The production of 1, 1, 2-trifluoro-2-(trifluoromethyl)cyclobutane (TFMCB). More specifically, the present invention relates to a process for making 1, 1, 2-trifluoro-2-(trifluoromethyl)cyclobutane via a continuous catalytic reaction from commercially available raw materials ethylene and hexafluoropropene.