When the distillation system is shut down, the condition for stopping the circulating slurry is that there is no catalyst in the settler
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When the distillation system is shut down, the condition for stopping the circulating slurry is that there is no catalyst in the settler. Why is that?
The purpose of returning the slurry to the tower is to wash out the catalyst particles present in the oil and gas resulting from the reaction. If the flow of the slurry is stopped too early, the catalyst in the settler will enter the distillation tower, which could lead to catalyst getting into the upper sections of the tower.
One of the principles for handling accidents in catalytic units is that as long as there is catalyst circulation in the reaction section, it is necessary to ensure that catalyst circulation in the distillation tower does not stop. The goal is to prevent reaction catalyst from entering the distillation tower; the slurry circulation can be used to carry it to the tank area