Continuous HFC-245eb Production via Cobalt Fluoride Catalyst Regeneration
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Solution Overview
Problem
The production of 1,1,1,2,3-pentafluoropropane (HFC-245eb) as an intermediate for 2,3,3,3-tetrafluoropropene (HFO-1234yf) is economically inefficient due to the high cost and complexity of raw materials and processes, leading to low industrial competitiveness, and existing methods result in significant by-product formation and handling challenges.
Innovation Solution
A method involving the use of 3,3,3-trifluoropropene as a starting material, with cobalt fluoride (CoF2/CoF3) as a fluid catalyst for indirect fluorination, allowing for continuous production of HFC-245eb through a catalytic reaction and regeneration process, utilizing a reactor and regenerator with paddle-type blades and screw conveyors for efficient cobalt fluoride transfer and reaction control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HFP is used as a starting material to produce HFC-245eb, then the intermediate can be used to produce HFO-1234yf, but the process is expensive and complex with low industrial competitiveness
Solution Approach 1:
The patent extracts and eliminates the complex multi-step process (hydrogenation, dehydrofluorination, hydrogenation) from the production route. Instead of using HFP as starting material requiring 4 operations, the invention directly uses HCC-250fb and performs fluorination followed by dehydrochlorination to produce HFC-245eb, reducing the process to 2 operations and removing unnecessary intermediate steps.
Solution Approach 2:
The patent inverts the conventional production sequence. Instead of hydrogenation first then fluorination (as in the HFP route), the invention performs fluorination first to introduce fluorine atoms, then dehydrochlorination to complete the transformation. This reversal simplifies the process and improves industrial competitiveness.
2Ease of manufacture
If HCC-250fb is used as a starting material with conventional fluorination methods, then raw material cost is reduced, but significant by-products are produced requiring separate handling processes
Solution Approach 1:
The patent introduces a catalyst as an intermediary substance to mediate the fluorination reaction. The catalyst enables selective fluorination of HCC-250fb to produce HFC-245eb with high selectivity, minimizing by-product formation. The catalyst provides an alternative reaction pathway with lower activation energy and higher selectivity compared to conventional uncatalyzed fluorination methods.
Solution Approach 2:
The patent optimizes reaction parameters including temperature, pressure, and catalyst concentration to maximize selectivity for HFC-245eb production. By controlling these parameters, the reaction favors the desired product pathway over side reactions that会产生 by-products, thereby reducing the need for separate by-product handling processes.
3Productivity
If conventional fluorination methods are used, then the reaction can proceed, but the process requires multiple operations including photo-reaction and by-product conversion
Solution Approach 1:
The patent implements a continuous production process where HCC-250fb is continuously fluorinated and then dehydrochlorinated in sequence. The catalyst remains active throughout the process, enabling continuous conversion without interruption. This eliminates the need for separate batch operations for photo-reaction, by-product conversion, and main reaction, improving productivity and reducing operational complexity.
Solution Approach 2:
The patent merges the fluorination and dehydrochlorination steps into an integrated process sequence. Instead of performing these as separate operations with intermediate isolation and handling, the invention combines them in a streamlined workflow where the product of fluorination directly feeds into dehydrochlorination, reducing the total number of operations and improving efficiency.
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 enables high-yield, continuous production of HFC-245eb with reduced by-product formation, improving economic efficiency and process simplicity by optimizing the molar ratios of CoF3 and CoF2 and adjusting reaction conditions, thereby enhancing the conversion rate and selectivity.
Implementation Method 1
cobalt fluoride (CoF2/CoF3) as a fluid catalyst for indirect fluorination
Implementation Method 2
utilizing a reactor and regenerator with paddle-type blades and screw conveyors for efficient cobalt fluoride transfer
Data Source
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AI summary
An apparatus for a method of continuously producing 1,1,1,2,3-pentafluoropropane with high yield is provided. The apparatus comprises a reactor, a first and second screw conveyor and a regenerator. The method includes (a) bringing a CoF3-containing cobalt fluoride in a reactor into contact with 3,3,3-trifluoropropene to produce a CoF2-containing cobalt fluoride and 1,1,1,2,3-pentafluoropropane, (b) transferring the CoF2-containing cobalt fluoride in the reactor to a regenerator and bringing the transferred CoF2-containing cobalt fluoride into contact with fluorine gas to regenerate a CoF3-containing cobalt fluoride, and (c) transferring the CoF3-containing cobalt fluoride in the regenerator to the reactor and employing the transferred CoF3-containing cobalt fluoride in Operation (a). Accordingly, the 1,1,1,2,3-pentafluoropropane can be continuously produced with high yield from the 3,3,3-trifluoropropene using a cobalt fluoride (CoF2/CoF3) as a fluid catalyst, thereby improving the reaction stability and readily adjusting the optimum conversion rate and selectivity.