Chlorination of 3,3,3-Trifluoropropene Under Pressure
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Solution Overview
Problem
Current processes for producing 2,3,3-tetrafluoro-1-propene (HFO 1234yf) lack detailed descriptions of the chlorination step to form 2,3-dichloro-1,1,1-trifluoropropane (243db), a crucial precursor, and do not achieve high selectivity and yield effectively.
Innovation Solution
A process involving the chlorination of 3,3,3-trifluoropropene to 2,3-dichloro-1,1,1-trifluoropropane under pressures greater than 2 bars, preferably between 4 and 50 bars, in the liquid phase, without added catalysts, followed by dehydrochlorination and fluorination steps to produce 2,3,3-tetrafluoro-1-propene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chlorination processes are used to prepare 2,3-dichloro-1,1,1-trifluoropropane, then the process can be carried out under standard conditions, but the selectivity and yield are insufficient
Solution Approach 1:
The patent applies parameter changes by conducting the chlorination reaction under elevated pressure conditions (greater than 2 bars, preferably 4-50 bars) and in the liquid phase, which fundamentally alters the reaction parameters from conventional atmospheric conditions. This pressure-induced parameter change achieves high selectivity (>90%) and conversion (>80%) for 2,3-dichloro-1,1,1-trifluoropropane without requiring complex catalyst systems or multi-step procedures
2Manufacturing precision
If detailed chlorination procedures are implemented to improve selectivity, then manufacturing precision increases, but the process becomes more complex
Solution Approach 1:
The patent achieves high conversion (>80%) through parameter changes specifically in pressure conditions and phase state, rather than through complex procedural steps. The simplified process requires only pressurizing the reaction system and maintaining liquid phase conditions, avoiding the need for multiple reaction steps, catalyst additions, or complex process controls that would increase device complexity
3Productivity
If pressure is increased to improve reaction efficiency, then productivity increases, but equipment requirements and operational complexity increase
Solution Approach 1:
The patent optimizes productivity by implementing moderate pressure conditions (greater than 2 bars, preferably 4-50 bars) that are sufficient to achieve high reaction efficiency without requiring extreme pressure equipment. This parameter change enables the use of simpler pressure-resistant reactors rather than complex high-pressure apparatus, maintaining operational simplicity while achieving selectivity >90% and conversion >80%
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 process achieves high selectivity and yield for 243db and subsequently 1234yf, with selectivity greater than 90% and conversion greater than 80%, simplifying the chlorination step and improving the overall efficiency of the production process.
Implementation Method 1
The invention provides a process for the preparation of 2,3-dichloro-1,1,1-trifluoropropane by chlorination of 3,3,3-trifluoropropene at a pressure greater than 2 bars
Implementation Method 2
followed by dehydrochlorination and fluorination steps to produce 2,3,3-tetrafluoro-1-propene
Data Source
AI summary
The subject of the invention is a process for the preparation of 2,3-dichloro-1,1,1-trifluoropropane by chlorination of 3,3,3-trifluoropropene at a pressure greater than 2 bar. Application in the synthesis of 1234yf.