Method for producing tetrafluoropropene
First Claim
1. A process for the manufacture of tetrafluoropropene employing three reactors and comprising the stages of:
- carrying out, in the first and the second reactor, at least one stage of reaction in the gas phase of a compound B in the presence of hydrofluoric acid and of a catalyst, in order to form the tetrafluoropropene;
alternately with a stage of regeneration of the catalyst by bringing the latter into contact with a regeneration stream comprising an oxidizing agent,carrying out, in the third reactor, a preliminary stage of manufacture of the compound B using a preliminary catalyst, alternately with a stage of regeneration of the preliminary catalyst with a regeneration stream comprising an oxidizing agent,wherein;
when the stage of regeneration of the preliminary catalyst in the third reactor is carried out, the first reactor and the second reactor are, independently of one another, either in a phase of regeneration of the catalyst or in a waiting phase.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention concerns a method for preparing tetrafluoropropene utilising three reactors and comprising the steps of (a) implementing, in the first and second reactors, at least one step of reacting, in the gas phase, a compound B in the presence of hydrofluoric acid and a catalyst, in alternation with a step of regenerating the catalyst by bringing it into contact with a regeneration flow comprising an oxidising agent, (b) implementing, in the third reactor, a preliminary step of producing the compound B, in alternation with a step of regenerating the preliminary catalyst with a regeneration flow comprising an oxidising agent. The step of regenerating the preliminary catalyst in the third reactor is implemented in the absence of a step of reacting the compound B in the presence of hydrofluoric acid in said first and second reactors. The present invention also concerns a facility configured to implement the present method.
1 Citation
9 Claims
-
1. A process for the manufacture of tetrafluoropropene employing three reactors and comprising the stages of:
-
carrying out, in the first and the second reactor, at least one stage of reaction in the gas phase of a compound B in the presence of hydrofluoric acid and of a catalyst, in order to form the tetrafluoropropene;
alternately with a stage of regeneration of the catalyst by bringing the latter into contact with a regeneration stream comprising an oxidizing agent,carrying out, in the third reactor, a preliminary stage of manufacture of the compound B using a preliminary catalyst, alternately with a stage of regeneration of the preliminary catalyst with a regeneration stream comprising an oxidizing agent, wherein; when the stage of regeneration of the preliminary catalyst in the third reactor is carried out, the first reactor and the second reactor are, independently of one another, either in a phase of regeneration of the catalyst or in a waiting phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification