HFO-1234yf Production via Feedstock Purification
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Solution Overview
Problem
Current methods for producing fluorinated olefins, such as 2,3,3-tetrafluoropropene (HFO-1234yf), face challenges including high costs, hazardous materials handling, and low yields due to the presence of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) in dehydrochlorination reactions, which reduces conversion efficiency and increases the formation of unwanted by-products like 3,3,3-trifluoropropyne.
Innovation Solution
The process involves reducing the concentration of HCFO-1233xf in the dehydrochlorination feedstock to less than 20% by weight, using a nickel-based metal alloy reactor, and employing methods like distillation, azeotropic distillation, or chromatography to purify the feedstock, thereby minimizing the presence of HCFO-1233xf and optimizing the conversion to HFO-1234yf while reducing the formation of 3,3,3-trifluoropropyne.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dehydrochlorination reaction is performed with conventional feedstock containing HCFO-1233xf, then the process can proceed, but conversion efficiency decreases and unwanted by-products increase
Solution Approach 1:
The patent applies preliminary action by removing HCFO-1233xf from the feedstock before the dehydrochlorination reaction. This is achieved through distillation or other separation techniques to reduce HCFO-1233xf concentration to less than 20% by weight, thereby preventing the formation of unwanted by-products like 3,3,3-trifluoropropyne and oligomers before they can form during the reaction.
Solution Approach 2:
The patent applies the extraction principle by specifically removing the harmful component HCFO-1233xf from the feedstock mixture. Through distillation or separation processes, HCFO-1233xf is extracted and removed to reduce its concentration, allowing the dehydrochlorination reaction to proceed with higher efficiency and fewer unwanted by-products.
2Productivity
If hydrogen gas is used in the dehydrochlorination process, then high yield can be achieved, but handling costs and safety risks increase
Solution Approach 1:
The patent replaces expensive and hazardous hydrogen gas with a cheaper and safer alternative approach. Instead of using hydrogen gas requiring specialized handling infrastructure, the process uses thermal dehydrochlorination or alternative reagents that can be handled more easily, achieving comparable yields without the need for expensive hydrogen plants and safety infrastructure.
3Productivity
If pyrolysis method is used to produce fluorinated olefins, then the process can proceed, but yield is low and catalyst deactivation occurs
Solution Approach 1:
The patent applies parameter changes by modifying the reaction conditions away from high-temperature pyrolysis. Instead of using extreme thermal conditions that cause catalyst deactivation and low yields, the process uses milder temperatures and different reaction mechanisms (such as dehydrochlorination at lower temperatures or alternative chemical pathways) to achieve higher yields while maintaining catalyst stability.
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 enhances the conversion efficiency of HCFC-244bb to HFO-1234yf, reduces the formation of undesirable by-products, and improves overall process economics by minimizing equipment costs and yield losses associated with removing 3,3,3-trifluoropropyne.
Implementation Method 1
dehydrochlorinating said starting material in the presence of a metal alloy
Implementation Method 2
employing methods like distillation, azeotropic distillation, or chromatography to purify the feedstock
Implementation Method 3
employing methods like distillation, azeotropic distillation, or chromatography to purify the feedstock
Implementation Method 4
employing methods like distillation, azeotropic distillation, or chromatography to purify the feedstock
Data Source
AI summary
A method for forming 2,3,3,3-tetrafluoropropene (HFO-1234yf) comprising providing a dehydrochlorination starting material having relatively low concentrations of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf), especially and preferable less than about 8.0% when the dehydrochlorination reaction utilizes no substantial amount of catalyst or catalyst comprising austenitic nickel-based materials.