Chromium Fluorination Catalyst Water Control for 2-Chloro-3,3,3-Trifluoropropene
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Solution Overview
Problem
Current processes for producing 2-chloro-3,3,3-trifluoropropene suffer from decreased catalytic activity over time, leading to reduced selectivity and inefficiencies, making continuous high-yield industrial production challenging.
Innovation Solution
A process involving the reaction of chlorine-containing compounds with anhydrous HF in a gas phase using a chromium atom-containing fluorination catalyst, with controlled low water content and the presence of molecular chlorine, to maintain catalytic activity and achieve high selectivity and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reaction is continued for a long period of time to maintain continuous production, then productivity is improved, but catalytic activity decreases resulting in reduced selectivity
Solution Approach 1:
The patent applies parameter changes by controlling the water content in the reaction system at a very low level (≤300 ppm). This parameter control prevents catalyst deactivation that would otherwise occur during prolonged reaction periods, thereby maintaining both continuous productivity and high selectivity throughout the reaction process
Solution Approach 2:
The patent implements preliminary anti-action by preemptively controlling water content to prevent catalyst deactivation before it occurs. By maintaining low water levels from the start of the reaction, the catalyst remains active and selective throughout extended operation periods, avoiding the need for frequent catalyst replacement or activation treatments
2Duration of action of stationary object
If stabilizers are added to suppress catalyst deterioration, then catalytic activity is maintained, but selectivity decreases
Solution Approach 1:
The patent applies the taking out principle by removing water (a harmful impurity) from the reaction system rather than adding stabilizers. By extracting the problematic water component and maintaining its level at ≤300 ppm, the catalyst remains active without requiring stabilizer additives that would compromise product selectivity
3Reliability
If liquid phase reaction with antimony halide catalyst is used, then catalytic activity is maintained, but reactor corrosion occurs and waste treatment is required
Solution Approach 1:
The patent applies phase transitions by conducting the reaction in the gas phase rather than liquid phase. This phase change eliminates the corrosion issues and waste treatment requirements associated with liquid phase reactions using antimony halide catalysts, while still maintaining reliable catalytic activity through chromium-based catalysts under controlled water content conditions
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 allows for continuous production of 2-chloro-3,3,3-trifluoropropene with high selectivity and yield over a long period, eliminating the need for frequent catalyst activation or replacement, thus being economically advantageous for industrial-scale production.
Implementation Method 1
reacting at least one chlorine-containing compound (A) selected from chloropropanes of formula (1) and chloropropenes of formula (2) or (3) with anhydrous HF in a gas phase in the presence of a chromium atom-containing fluorination catalyst while heating
Data Source
AI summary
This invention provides a process for producing 2-chloro-3,3,3-trifluoropropene, comprising: reacting anhydrous hydrogen fluoride with at least one chlorine-containing compound selected from the group consisting of chloropropanes and chloropropenes represented by specific formulas in a gas phase in the presence of a chromium atom-containing fluorination catalyst while heating, the reaction being carried out in the presence of molecular chlorine or with a water content in the reaction system of 300 ppm or less. This invention enables suppression of catalyst deterioration and efficient production of 2-chloro-3,3,3-trifluoropropene in a simple and economically advantageous manner on an industrial scale.