Should fuel oil antioxidants be added before acid wash degumming or after it? Which one is more effective?

Added after deacidification. If there is no deacidification device, it can be added directly as well, though the effect will be slightly poorer

If there is an acid-removal device, it is recommended to add it after acid removal. DT3041 Gasoline Antioxidant and Anti-gelling Agent (1) Product Overview: DT3041 Gasoline Antioxidant and Anti-gelling Agent is a new type of liquid antioxidant and anti-gelling agent. Its mechanism of action involves eliminating the reactivity of oxygen or oxygen-containing substances, thereby preventing oxidation or the formation of gums. It can also suppress the polymerization reactions caused by peroxides formed when fuel is exposed to air, ensuring that the product possesses excellent antioxidant and anti-gelling properties. (2) Main functions and features: ——Significantly improves the induction period of oils ； ——Effectively inhibits the regeneration of gums in oil products ； ——It exhibits good sensitivity to the blending components of various types of gasoline ； ——It does not interact with other additives used in the oil treatment process. (3) Usage method: ——Recommended dosage: 0.02-0.05‰ (by mass ratio); the specific amount to be added is determined through laboratory sample testing, depending on the properties of the gasoline and the requirements regarding its induction period ； (4) Scope of application: It is suitable for gasoline and gasoline blending components that require an extended induction period, and it is also effective in suppressing the regeneration of gums in petroleum products.

Additives are usually added in the final stage of the process; for example, pickling, as you mentioned, can cause the antioxidants to react. Generally, phenol-amine type antioxidants yield good results

It should be added after pickling; if there is a filtration device, it is better to add it after filtration