HFO-1234yf Fluorination with Organic Co-Feed to Limit Catalyst Deactivation
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Solution Overview
Problem
Current methods for producing hydrofluoroolefins like 2,3,3,3-tetrafluoropropene (HFO-1234yf) are either hazardous, economically costly, or result in significant byproduct formation, posing challenges for efficient and cost-effective production.
Innovation Solution
A process involving the vaporization of a fluorination agent and organic co-feed compounds in the presence of a fluorination catalyst, which includes specific organic co-feed compounds and stabilizers, to improve reaction efficiency and reduce catalyst deactivation, ultimately producing 2,3,3-tetrafluoropropene through a series of reaction steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrogen gas is used in the fluorination process, then reaction yield is improved, but safety hazards and equipment cost increase
Solution Approach 1:
The patent changes the chemical composition parameter by replacing hydrogen gas with organic co-feed compounds (such as HFO-1234yf, HFC-134a, or HFC-125) as the fluorinating agent. This parameter change eliminates the safety hazards associated with hydrogen gas handling while maintaining effective fluorination reaction yield through alternative chemical pathways.
2Ease of manufacture
If pyrolysis method is used to produce HFOs, then process simplicity is improved, but byproduct formation and catalyst deactivation increase
Solution Approach 1:
The patent introduces organic co-feed compounds as intermediary substances that mediate the fluorination reaction. These co-feed compounds facilitate the reaction between the starting material and fluorinating agent, enabling the process to proceed under milder conditions that reduce unwanted pyrolysis byproducts and minimize catalyst deactivation while maintaining process simplicity.
3Productivity
If traditional fluorination process is used, then production capacity is maintained, but catalyst life and reaction efficiency decrease
Solution Approach 1:
The patent implements continuous fluorination reactions using organic co-feed compounds that maintain stable catalytic activity over extended periods. The co-feed compounds prevent catalyst deactivation by avoiding the formation of carbonaceous deposits and other deactivating byproducts, thereby extending catalyst life and maintaining consistent production capacity without requiring frequent catalyst replacement or regeneration.
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 enhances reaction efficiency, reduces byproduct formation, and extends catalyst life, providing a more economical and safer method for producing HFO-1234yf with improved yield and reduced environmental impact.
Implementation Method 1
contacting the vaporized compound of formula I and the vaporized fluorinating agent in the vapor phase in the presence of a fluorination catalyst, to produce a final composition comprising 2-chloro-3,3,3-trifluoropropene
Implementation Method 2
The organic co-feed compound improves the foregoing process, particularly by decreasing starting reagent oligomerization/polymerization and/or reducing catalyst deactivation over the course of the process
Implementation Method 3
vaporizing a fluorination agent and a composition comprising at least one compound of formula I
Data Source
Figure 1
AI summary
The present invention relates, in part, to the discovery that, during the fluorination of certain fluoroolefin starting reagents, particularly, 1,1,2,3-tetrachloropropene (1230xa), oligomerization/polymerization of such starting reagents reduces the conversion process and leads to increased catalyst deactivation. The present invention also illustrates that providing one or more organic co-feed to the fluooolefin starting stream reduces such oligomerization/polymerization and improves catalystic stability.