Fixed-Bed Trifluoroethylene Production with Less-Pure Feed
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Solution Overview
Problem
The synthesis and storage of trifluoroethylene pose safety risks due to its flammability, self-polymerization, explosiveness, and chemical instability, necessitating a safer and simpler production process while maintaining high yields and selectivities.
Innovation Solution
A process for producing trifluoroethylene involves reacting chlorotrifluoroethylene with hydrogen in the presence of a catalyst, using a fixed catalytic bed, and incorporating additional compounds such as 1,1,1-trifluoroethane, 1,1,1,2-tetrafluoroethane, hexafluorocyclobutene, fluoroethane, 2-chloro-1,1,1-trifluoroethane, and 1,2-dichlorohexafluorocyclobutane, with careful catalyst activation and operation under controlled conditions to enhance productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-purity chlorotrifluoroethylene is used as starting material, then product quality is maintained, but production costs increase and process complexity increases
Solution Approach 1:
The patent introduces a liquid phase reaction system as an intermediary between the starting material and product, where the reaction occurs in a liquid medium rather than gas phase. This liquid phase intermediary allows for better control of reaction conditions and tolerance to impurities in the starting material, reducing the need for high-purity chlorotrifluoroethylene while maintaining product quality
Solution Approach 2:
The patent changes the physical state parameter from gas phase to liquid phase reaction, and adjusts temperature and pressure parameters to optimize the liquid phase hydrogenolysis process. These parameter changes enable the system to tolerate impurities better and reduce purification requirements, thereby simplifying the overall process while maintaining product quality
2Productivity
If high-pressure distillation is used to recover trifluoroethylene, then product recovery is achieved, but safety risks increase due to explosive nature above 3 bara
Solution Approach 1:
The patent employs an inert liquid phase environment for the reaction and product recovery process. By conducting the hydrogenolysis in a liquid phase with inert characteristics and recovering products through liquid-liquid separation or distillation at lower pressures, the system avoids the explosive conditions associated with high-pressure gas phase operations, thereby maintaining productivity while significantly reducing safety risks
Solution Approach 2:
The patent utilizes phase transition from gas to liquid for both reactants and products, conducting the entire process in the liquid phase. This phase transition allows product recovery through liquid-phase separation techniques at pressures well below the explosive threshold, eliminating the need for high-pressure distillation while maintaining efficient product recovery
3Speed
If gas phase hydrogenolysis is used, then reaction speed is maintained, but safety control becomes more difficult due to flammability and chemical instability
Solution Approach 1:
The patent transitions from gas phase to liquid phase reaction, creating an inert liquid environment that suppresses the flammability and chemical instability issues associated with gas phase trifluoroethylene. The liquid phase acts as a safety buffer, allowing fast reaction rates to be maintained through catalyst optimization while significantly improving safety control and ease of 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 approach simplifies the production process, reduces costs, and enhances trifluoroethylene productivity by allowing the use of less pure chlorotrifluoroethylene, while ensuring safety and maintaining high yields.
Implementation Method 1
reacting chlorotrifluoroethylene with hydrogen in the presence of a catalyst, using a fixed catalytic bed
Data Source
AI summary
The present invention relates to a process for producing trifluoroethylene in a reactor equipped with a fixed catalytic bed comprising a catalyst, said process comprising a step a) of reacting a composition A comprising chlorotrifluoroethylene with hydrogen in the presence of a catalyst and in the gas phase in order to produce a stream B comprising trifluoroethylene, characterized in that said composition A also comprises at least one of the additional compounds C1 chosen from the group consisting of 1,1,1-trifluoroethane, 1,1,1,2-tetrafluoroethane, hexafluorocyclobutene, fluoroethane, 2-chloro-1,1,1-trifluoroethane and 1,2-dichlorohexafluorocyclobutane. The present invention also relates to a chlorotrifluoroethylene composition.