Why is the antioxidant for catalytic gasoline desulfurization units added after the oxidation tower?
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Why is the antioxidant in the catalytic gasoline desulfurization unit added after the oxidation tower, while the activator is added before it? What would be the consequences if antioxidants were added before the oxidation tower? Is it possible that antioxidants undergo some chemical reaction with polytitanocobalt or alkaline solutions within the oxidation tower bed? Or could some coloring reaction occur, resulting in an abnormal color of the refined gasoline (it is said that this can cause the gasoline to take on a pink color after being left standing for some time)?
The antioxidant in catalytic gasoline desulfurization units is an additive used to adjust gasoline specifications; if added in advance, it can affect the reactions taking place inside the tower. The activator is added before the oxidation tower, mainly to increase the activity of the catalyst; what effect does it have when added later?
The activator provides the alkaline environment necessary for the deodorization reaction, as well as for cleaning the reaction bed. Understanding its function makes it clear that it needs to be introduced into the oxidation tower. Antioxidants are additives that protect the quality of gasoline (by extending its induction period); if added too early, they may participate in the reactions and thus fail to provide protection. In short, one is required for the reactions, while the other is needed for the gasoline itself