Method for producing trifluoroethylene
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- ARKEMA FRANCE SA
- Filing Date
- 2021-10-27
- Publication Date
- 2026-06-12
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
【0007】 本発明によって、効率的なトリフルオロエチレンの製造方法を提供できるようになる。特に、本発明によって、経時的な変換を増大させることができる。本方法の実施は、触媒の活性が過度に低下する場合に特に重要である。固定触媒床の温度の上昇は、さもなければ減少し続けたであろう触媒の活性を劇的に上昇させる。したがって、本発明によって、トリフルオロエチレンの高い生産性を経時的に維持することができるようになり、方法の生産性全体に影響を与えるであろう、触媒の過度に頻繁な再生ステージが回避できるようになる。したがって、本発明は、触媒の寿命を延長し、したがって方法の全体的な効率を改善するように、反応の温度を制御する方法を提供する。
Smart Images
Figure 0007873665000001
Abstract
Claims
1. A method for producing trifluoroethylene in a reactor equipped with a fixed catalyst bed containing a catalyst, comprising stage a) a reaction between chlorotrifluoroethylene and hydrogen in the presence of the catalyst and in the gas phase for producing a stream containing trifluoroethylene, the stage a) being performed at a temperature T1 of the fixed catalyst bed between 50°C and 250°C. During stage a), the temperature T1 of the fixed catalyst bed is increased under conditions not exceeding 300°C. The catalyst is based on metals from the 8th to 10th columns of the periodic table, deposited on a support made of aluminum or carbon. A method characterized by the following features.
2. The method according to claim 1, characterized in that the temperature T1 of the fixed catalyst bed does not exceed 290°C.
3. The method according to claim 1 or 2, characterized in that the temperature T1 of the fixed catalyst bed is 50°C to 230°C.
4. The method according to any one of claims 1 to 3, characterized in that the temperature T1 of the fixed catalyst bed is increased by a value of 5°C to 45°C.
5. The method according to any one of claims 1 to 4, characterized in that during stage a), the temperature T1 of the stationary catalyst bed is raised by 5°C and 45°C to a temperature T1a, and the temperature T1a is maintained for a period of more than 30 minutes.
6. The method according to any one of claims 1 to 5, characterized in that, during the reaction of stage a), at a given time t, the longitudinal temperature difference between the inlet of the fixed catalyst bed and the outlet of the fixed catalyst bed is less than 20°C.
7. The method according to claim 1, characterized in that the catalyst is palladium supported on α-alumina.
8. The method according to any one of claims 1 to 7, characterized in that the hydrogen is introduced into the reactor at a temperature of 30°C to 240°C.
9. The method according to any one of claims 1 to 8, characterized in that the chlorotrifluoroethylene is introduced into the reactor at a temperature of 30°C to 240°C.
10. The method according to any one of claims 1 to 9, characterized in that stage a) is performed at a pressure of less than 2 bar.
11. The method according to any one of claims 1 to 10, characterized in that the flow rate for introducing hydrogen into the reactor or the flow rate for introducing CTFE or both is reduced in order to raise the temperature T1 of the fixed catalyst bed.
12. The method according to any one of claims 1 to 11, characterized in that the reactor comprises a jacket containing a heat transfer fluid for controlling the temperature T1 of the fixed catalyst bed, and the temperature T2 of the jacket of the reactor is 0°C to 200°C.
13. The method according to claim 12, characterized in that the temperature T2 of the jacket is 0°C to 180°C.
14. The method according to any one of claims 12 or 13, characterized in that during stage a), the temperature T2 of the jacket of the reactor is increased by a value of 0°C to 50°C.
15. The method according to any one of claims 12 to 14, characterized in that during stage a), the temperature T2 of the jacket of the reactor is raised by 0°C and 50°C to a temperature T2a, and the temperature T2a is maintained for a period of more than 30 minutes.
16. The method according to any one of claims 12 to 15, characterized in that the reactor includes a plurality of tubes, each containing at least one stationary catalyst bed containing the catalyst.