Catalyst Conditioning for HFO-1132E Production
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Solution Overview
Problem
The production of trans-1,2-difluoroethylene (HFO-1132E) from 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) is hindered by the formation of undesired intermediates and byproducts, which need to be minimized or converted into desired products.
Innovation Solution
The process involves catalyst conditioning and reactant dilution methods to manage the formation of intermediates and minimize byproducts during the hydrogenation and dehydrofluorination steps, using specific reaction conditions and inert gas dilution to enhance the production of 1,1,2-trifluoroethane (HFC-143) and its intermediates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydrogenation of CFC-113 is performed to produce HFC-143, then the desired product HFC-143 is formed, but undesired intermediates and byproducts are also generated
Solution Approach 1:
The patent applies parameter changes by implementing a two-stage temperature profile: an initial high temperature stage (250-350°C) for catalyst conditioning and selective intermediate formation, followed by a reduced temperature stage (200-275°C) for main hydrogenation. This temperature parameter change enables selective conversion of desired intermediates to HFC-143 while minimizing undesired byproducts, resolving the contradiction between product selectivity and harmful intermediate formation.
Solution Approach 2:
The patent employs preliminary action by conducting catalyst conditioning at high temperature before the main hydrogenation reaction. This preliminary high-temperature treatment modifies the catalyst surface properties to enhance selectivity during subsequent hydrogenation, preventing undesired byproduct formation while promoting desired intermediate conversion to HFC-143.
2Productivity
If reaction time is extended to convert intermediates to HFC-143, then product yield increases, but reaction temperature must be reduced which may slow the reaction rate
Solution Approach 1:
The patent uses preliminary high-temperature catalyst conditioning to activate the catalyst surface before the main reaction. This preliminary action ensures that when the reduced temperature stage begins, the catalyst is already optimized for selective conversion, allowing extended reaction time at lower temperature to achieve high HFC-143 yield without excessive rate reduction.
Solution Approach 2:
The patent implements parameter changes through the two-stage temperature profile, transitioning from high temperature (250-350°C) for catalyst activation to reduced temperature (200-275°C) for selective hydrogenation. This parameter transition enables both high productivity through extended reaction time and maintained reaction rate through initial high-temperature conditioning.
3Productivity
If catalyst activity is increased to improve reaction rate, then productivity increases, but formation of undesired byproducts increases
Solution Approach 1:
The patent applies parameter changes by using a two-stage temperature approach: initial high temperature (250-350°C) to activate catalyst and form desired intermediates, followed by reduced temperature (200-275°C) to complete hydrogenation with high selectivity. This temperature parameter change allows the catalyst to operate at high activity during the first stage while minimizing byproduct formation during the second stage.
Solution Approach 2:
The patent employs preliminary high-temperature catalyst conditioning to optimize the catalyst surface before main hydrogenation. This preliminary action ensures high reaction rate during the first stage while setting up selective conditions for the second stage, thereby increasing productivity without proportionally increasing undesired byproduct formation.
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 increases the selectivity and efficiency of producing 1,1,2-trifluoroethane (HFC-143) and its intermediates while minimizing undesired byproducts, resulting in a higher yield of trans-1,2-difluoroethylene (HFO-1132E).
Implementation Method 1
hydrogenating 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) by reaction with hydrogen in the presence of a catalyst
Implementation Method 2
The 1,1,2-trifluoroethane (HFC-143) is then dehydrofluorinated in the presence of a catalyst to produce trans-1,2-difluoroethylene (HFO-1132E)
Implementation Method 3
The cis-1,2-difluoroethylene (HFO-1132Z) may then be isomerized to produce trans-1,2-difluoroethylene (HFO-1132E)
Data Source
AI summary
In a first step reaction for producing 1,1,2-trifluoroethane (HFC-143) from 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) as part of an overall method for production of trans-1,2-difluoroethylene (HFO-1132E), several intermediates and/or byproducts are formed, some of which may be considered desired and others undesired. The overall reaction methods and/or specific reactions conditions for producing 1,1,2-trifluoroethane (HFC-143) from 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) may be selectively tailored, such as with catalyst conditioning and/or reactant dilution with an inert gas, to usefully convert desired intermediates to the desired product 1,1,2-trifluoroethane (HFC-143) and/or minimize the formation of undesired byproducts.