Fluorinated Olefin Synthesis Without Pentafluoropropane Isolation
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Solution Overview
Problem
Existing methods for producing tetrafluoropropenes like HFO-1234yf are limited by the requirement of isolating 1,1,1,3,3-pentafluoropropane as a starting reactant, which is costly and less available, and there is a need for more ecologically friendly and efficient production processes.
Innovation Solution
A process involving the reaction of HF with CCl2=CClCH2Cl (HFCO-1230) to produce CF3CHFCH2F, followed by dehydrohalogenation to yield 2,3,3,3-tetrafluoropropene (HFO-1234yf), using catalysts like SbCl5 and KOH, with conditions optimized for high conversion and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing methods using 1,1,1,3,3-pentafluoropropane as starting material are employed, then tetrafluoropropene can be produced, but the production cost increases and material availability decreases
Solution Approach 1:
The patent replaces the expensive and less available 1,1,1,3,3-pentafluoropropane starting material with cheaper and more readily available alternatives such as 1,1-difluoroethane and hydrogen fluoride. This substitution directly addresses the cost and availability issues while maintaining the ability to produce high-purity tetrafluoropropene through the fluorination process
Solution Approach 2:
The patent changes the chemical parameters of the starting materials from highly fluorinated compounds to less fluorinated compounds (1,1-difluoroethane + HF). This parameter change in the starting material composition enables access to cheaper, more available materials while achieving the same product through different reaction pathways
2Manufacturing precision
If existing methods using 1,1,1,3,3-pentafluoropropane are employed, then tetrafluoropropene can be produced, but the process complexity increases due to isolation requirements
Solution Approach 1:
By using 1,1-difluoroethane and HF as starting materials instead of 1,1,1,3,3-pentafluoropropane, the patent simplifies the overall process workflow. The new starting materials do not require the same isolation steps, reducing process complexity while still achieving high product purity through the fluorination reaction and subsequent purification
3Productivity
If dehydrohalogenation of CF3CH2CF2H is performed in gas phase, then 1,3,3,3-tetrafluoropropene can be produced, but the starting material availability is limited
Solution Approach 1:
The patent fundamentally changes the starting material parameters from 1,1,1,3,3-pentafluoropropane (CF3CH2CF2H) to 1,1-difluoroethane (CH3CHF2) combined with hydrogen fluoride. This parameter change in substrate selection resolves the availability limitation while maintaining production efficiency through the fluorination-dehydrohalogenation pathway
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 of HFO-1234yf, using readily available and inexpensive starting materials, with yields up to 98.6% purity and 95% selectivity, suitable for large-scale production.
Implementation Method 1
reacting a compound of formula (I) with a compound of formula (II) to produce a reaction product comprising a compound of formula (III)
Implementation Method 2
using catalysts like SbCl5 and KOH
Implementation Method 3
followed by dehydrohalogenation to yield 2,3,3,3-tetrafluoropropene (HFO-1234yf)
Implementation Method 4
optionally distillation for purification
Data Source
AI summary
Disclosed is a process for the synthesis of fluorinated olefins, and in particularly preferred embodiments tetrafluorinated olefins having F on an unsaturated, non-terminal carbon, such as 2,3,3,3-tetrafluoropropene. The preferred processes of the present invention in accordance with one embodiment generally comprise:(a) reacting a compound of formula (I)with a compound of formula (II)to produce a reaction product comprising a compound of formula (III)and(b) exposing said compound of formula (III) to reaction conditions effective to convert said compound of formula (III) to a compound of formula (IV)wherein X1, X2, and X3 are each independently selected from the group consisting of hydrogen, chlorine, bromine, fluorine and iodine, provided that X1 and X2 in formula (I) are not both hydrogen and Z is Cl, I, Br, or F.