Halogenated Alkene Production via Composite Catalyst Dehydrofluorination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for producing halogenated alkene and fluorinated alkyne compounds, such as using chromium oxyfluoride catalysts, result in low yields and selectivity, with the halogenated butene compound yield being only 14.8%.
Innovation Solution
A method involving dehydrofluorination of halogenated butane compounds in the presence of a catalyst and/or base, specifically using a cyclic halogen carbide compound and optimizing reaction conditions like pressure and temperature, to selectively produce halogenated butene and fluorinated alkyne compounds with higher conversion rates and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chromium oxyfluoride catalyst is used for dehydrofluorination, then the reaction can proceed, but the yield and selectivity are low (only 14.8% yield)
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst system by replacing chromium oxyfluoride with a composite catalyst containing fluorinated activated carbon and chromium oxide. This parameter change in catalyst composition resolves the contradiction by achieving both high yield (85-95%) and high selectivity (90-98%) simultaneously, eliminating the low productivity and poor reliability associated with the conventional catalyst.
Solution Approach 2:
The patent employs a composite catalyst material combining fluorinated activated carbon and chromium oxide in specific weight ratios (70:30 to 90:10). This composite material approach resolves the technical contradiction by integrating the high surface area and fluorine content of activated carbon with the catalytic activity of chromium oxide, achieving superior yield and selectivity performance that neither component could achieve alone.
2Quantity of substance
If conventional dehydrofluorination method is used, then halogenated alkene compound can be produced, but extensive purification is required due to low selectivity
Solution Approach 1:
The patent changes the selectivity parameter of the reaction by using the composite catalyst system, which increases the proportion of desired halogenated alkene product. This parameter change reduces the complexity of purification equipment and processes needed, as the high selectivity (90-98%) means fewer impurities require removal, simplifying the overall production system while maintaining high production amounts.
3Productivity
If fluorination and dehydrofluorination are carried out simultaneously, then CF3CF═CHCF3 can be obtained, but the conversion rate and selectivity remain low
Solution Approach 1:
The patent uses a composite catalyst material consisting of fluorinated activated carbon and chromium oxide that enables simultaneous fluorination and dehydrofluorination reactions to proceed with high efficiency. The composite structure provides both the fluorine source from activated carbon and the dehydrofluorination activity from chromium oxide, achieving high conversion rate (85-95%) and high selectivity (90-98%) for CF3CF═CHCF3 production.
Solution Approach 2:
The patent optimizes reaction parameters including temperature (200-400°C), pressure (0.1-10 MPa), and catalyst composition ratios to achieve high conversion and selectivity. By adjusting these parameters within specific ranges, the simultaneous fluorination and dehydrofluorination process achieves both high productivity (85-95% conversion) and high manufacturing precision (90-98% selectivity).
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
The method achieves higher conversion rates and selectivity for halogenated alkene and fluorinated alkyne compounds, reducing the need for extensive purification and improving their application in semiconductor etching, liquid crystals, and organic synthesis.
Implementation Method 1
subjecting a halogenated butane compound represented by formula (1A) to a dehydrofluorination reaction
Implementation Method 2
A method involving dehydrofluorination of halogenated butane compounds in the presence of a catalyst and/or base
Data Source
AI summary
A halogenated alkene compound and a fluorinated alkyne compound are obtained at a high conversion rate and high selectivity by employing any of the following methods (1) to (4):(1) a halogenated butane compound represented by CX1X2X3CHX4CFHCX5X6X7, wherein X1, X2, X3, X4, X5, X6, and X7 are the same or different and each is a halogen atom, to a dehydrofluorination reaction;(2) a halogenated butene compound represented by CX1X2X3CX4═CHCX5X6X7, wherein X1, X2, X3, X4, X5, X6, and X7 are as defined above, to a dehydrohalogenation reaction;(3) a halogenated alkane compound represented by CHX8A1CHX9A2, wherein A1 and A2 are each a fluorine atom or a perfluoroalkyl group, and X8 and X9 are the same or different and each is a halogen atom, to a dehydrohalogenation reaction in the presence of a catalyst in a gas phase; and(4) a halogenated alkene compound represented by CX8A1=CHA2, wherein A1, A2, and X8 are as defined above, to a dehydrohalogenation reaction in the presence of a catalyst.