Low-Impurity Alumina Catalysts for Fluoroolefin Conversion
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Solution Overview
Problem
Conventional methods for producing fluoroolefins using various aluminas as catalysts often result in low conversion rates.
Innovation Solution
A method involving the use of an alumina-containing catalyst with limited alkali metal and alkaline earth metal content and Si content, preferably containing α-alumina, to produce fluoroolefins from fluorocarbons at specific temperatures and conditions, including the presence of inert gases, to enhance conversion rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If various aluminas are used as catalysts for dehydrofluorination reaction, then the reaction can proceed, but the conversion rate becomes low
Solution Approach 1:
The patent changes the compositional parameters of the alumina catalyst by strictly controlling the content of alkali metals (Na, K) and alkaline earth metals (Ca, Mg) to 100 ppm or less, and Si content to 1000 ppm or less. This parameter optimization resolves the contradiction by improving conversion rate while maintaining catalyst reliability through consistent composition control.
Solution Approach 2:
The patent develops a composite catalyst system based on alumina with controlled impurities. By combining alumina with specific purity levels and controlled compositions, the catalyst achieves both high conversion rate and reliable performance, resolving the contradiction between productivity and reliability.
2Productivity
If conventional alumina catalysts are used, then the production process is simple, but the conversion rate is low
Solution Approach 1:
The patent implements strict parameter control for catalyst composition (alkali metals ≤100 ppm, alkaline earth metals ≤100 ppm, Si ≤1000 ppm). This parameter optimization increases conversion rate while the controlled complexity ensures reproducibility and reliability in industrial production.
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 a higher conversion rate of fluorocarbons to fluoroolefins compared to conventional methods, with improved selectivity and catalyst durability, suitable for industrial production.
Implementation Method 1
contacting a fluorocarbon represented by the following Formula (1) with an alumina-containing catalyst to produce a fluoroolefin
Data Source
AI summary
A method of producing fluoroolefin includes contacting a fluorocarbon represented by Formula (1): CX1X2F—CX3X4H with an alumina-containing catalyst to produce a fluoroolefin represented by Formula (2): CX1X2═CX3X4, in which the alumina-containing catalyst satisfies at least one of the following conditions (I) or (II). (I) A total content of alkali metal elements and alkaline earth metal elements is 100 ppm by mass or less. (II) A Si content is 1000 ppm by mass or less.