Crystallized Chromium Oxide Catalyst Fluoroolefin Conversion
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Solution Overview
Problem
Current methods for producing fluoroolefins using a chlorine-containing alkane or alkene with a fluorinating agent and a catalyst, such as amorphous chromium oxide, suffer from low conversion rates and impurity generation, leading to yield decreases and purification complications.
Innovation Solution
Employing a crystallized chromium oxide catalyst or fluorinated chromium oxide catalyst with specific crystallinity and average crystallite diameter, and adjusting reaction conditions like oxygen presence, to enhance the conversion rate and selectivity of fluoroolefins during the reaction with a chlorine-containing compound and a fluorinating agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If amorphous chromium oxide catalyst is used, then the reaction can proceed, but the conversion rate of starting material is low and impurity generation increases
Solution Approach 1:
The invention changes the physical state parameter of the chromium oxide catalyst from amorphous to crystallized form. This parameter change fundamentally alters the catalytic properties, enabling higher conversion rates while suppressing impurity generation. The crystallized structure provides defined active sites that favor the desired fluorination reaction pathway.
Solution Approach 2:
The invention utilizes phase transition of chromium oxide from amorphous to crystallized state. This phase transition transforms the catalyst's electronic structure and surface properties, creating a more active and selective catalytic system that improves both conversion rate and product selectivity.
2Productivity
If amorphous chromium oxide catalyst is used, then the reaction can proceed, but the selectivity of target fluoroolefin decreases
Solution Approach 1:
The invention changes the structural parameter of the catalyst from amorphous to crystallized chromium oxide. This structural reorganization creates specific crystal planes and active sites that are highly selective for the desired fluorination reaction, thereby improving target product selectivity and reducing by-product formation.
3Reliability
If oxygen is entrained with reactant to maintain catalyst activity, then catalyst activity is maintained, but side reaction produces CO2 and other by-products
Solution Approach 1:
The invention changes the catalyst form from amorphous to crystallized chromium oxide, which fundamentally alters how the catalyst interacts with oxygen and reactants. The crystallized structure provides controlled oxygen activation that maintains catalyst activity without promoting unwanted side reactions, thereby eliminating CO2 and by-product generation.
Solution Approach 2:
The invention converts the previously harmful effect of oxygen (which caused side reactions with amorphous catalyst) into a beneficial effect. The crystallized chromium oxide structure allows oxygen to be activated in a controlled manner that enhances catalytic activity while preventing harmful side reactions, effectively turning a harmful factor into a useful one.
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 significantly improves the conversion rate and selectivity of fluoroolefins, reducing impurity generation and purification costs, resulting in a more efficient and cost-effective production process.
Implementation Method 1
reacting a fluorinating agent and a chlorine-containing compound in a gas phase in the presence of at least one catalyst selected from the group consisting of chromium oxide, at least part of which is crystallized, and fluorinated chromium oxide obtained by fluorinating the chromium oxide
Data Source
AI summary
The present invention provides a process for producing a fluoroolefin by reacting, in a gas phase, a fluorinating agent and a chlorine-containing alkene or a chlorine-containing alkane in the presence of at least one catalyst selected from the group consisting of chromium oxide, at least part of which is crystallized, and fluorinated chromium oxide obtained by fluorinating the chromium oxide. According to the present process, a target fluoroolefin can be obtained at a high conversion rate of the starting material and with high selectivity.