Halogenated Olefin Isomerization Catalyst Process
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Solution Overview
Problem
Current processes for producing halogenated olefins, such as tetrafluoropropene, often result in a mixture of geometric isomers, with trans-form being more desirable for certain applications, but existing methods are inefficient and costly, requiring complex processing steps to separate isomers and limited to specific types of olefins.
Innovation Solution
A process involving the use of metal-based catalysts like halogenated metal oxides, Lewis acid metal halides, and zero-valent metals to convert cis-C2-C6 olefins to trans-C2-C6 olefins, achieving high conversion rates and selectivity by optimizing reaction conditions like temperature and residence time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing separation processes are used to enrich geometric isomers, then the concentration of desirable trans-form can be increased, but the process requires substantial processing steps and high costs without producing additional quantities of the desirable isomer
Solution Approach 1:
The patent changes the fundamental parameter from separation (physical property-based) to chemical transformation (reactivity-based). By introducing a catalyst and controlling reaction conditions (temperature, pressure, residence time), the process transforms cis-isomers into trans-isomers chemically, achieving both concentration enrichment and quantity production simultaneously
Solution Approach 2:
The patent introduces a catalyst as an intermediary substance that facilitates the isomerization reaction. The catalyst enables selective conversion of cis-form to trans-form by providing an alternative reaction pathway with lower activation energy, allowing the process to proceed under milder conditions with higher selectivity
2Productivity
If catalytic isomerization is applied to produce trans-form from cis-form, then additional quantities of desirable isomer can be produced, but the process requires substantial processing steps and high costs
Solution Approach 1:
The patent optimizes reaction parameters including temperature (typically 50-200°C), pressure, and residence time to achieve high conversion efficiency. By carefully controlling these parameters, the process maximizes trans-form production while minimizing energy consumption and equipment complexity requirements
Solution Approach 2:
The catalytic process is designed to be self-sustaining where the catalyst continues to facilitate isomerization as long as cis-form substrate is present. The reaction conditions are optimized so that the system naturally drives toward equilibrium favoring the trans-form, reducing the need for additional processing steps
3Productivity
If existing isomerization processes are used, then conversion of cis-form to trans-form can be achieved, but the processes are limited to specific types of olefins and require multiple molecular species to be fed to the reaction system
Solution Approach 1:
The patent employs a catalyst system that demonstrates broad applicability across different halogenated olefin substrates. The catalytic mechanism is not substrate-specific and can handle various C2-C6 olefins with different halogen substitutions, making the process universally applicable to multiple olefin types without requiring separate process development for each substrate
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 effectively converts at least 50% of cis-form compounds to trans-form with high selectivity, particularly for tetrafluoropropene, reducing processing complexity and costs while achieving high conversion rates, even from feed streams with low concentrations of the cis-form.
Implementation Method 1
A process involving the use of metal-based catalysts like halogenated metal oxides, Lewis acid metal halides, and zero-valent metals to convert cis-C2-C6 olefins to trans-C2-C6 olefins
Data Source
AI summary
Disclosed are processes for the conversion of isomerizable halogenated C2-C6 olefins from one geometric form to a more preferred geometric form. Preferred process aspects comprise converting C2-C6 olefin in a cis-form to a trans-form comprising exposing the cis-form of the compound, preferably contained in process stream, to conditions effective to convert at least about 50 percent, and even more preferably at least about 70 percent, of the cis-form compound to the trans-form compound. Preferably the catalyst comprises at least one Lewis acid metal fluoride.