How to handle the gasoline from the distillation flash tower

Our company has also encountered such problems, which have already led to the shutdown of two hydrogenation units. The solution lies in addressing the issue at its source. I’m not sure what the nature of the crude oil in your area is, nor whether chlorine-containing additives are used; if so, efforts should be made to replace them or to ban the use of such additives. If the salt content in crude oil is high, it is necessary to operate the electrical desalination unit properly, with the target value ideally being less than 2. How should the hydrogenation unit handle this? Since the crystallization temperature of chlorides is high, the water injection point should be moved forward, and large amounts of water should be injected to reduce chloride crystallization. Another option is to add a dechlorination reactor after the hydrogenation reactor, but the investment is very high. Finally, a corrosion inhibitor is added to the reaction system to form a protective film on the tube walls, preventing crystalline corrosion caused by ammonium salts. In my opinion, the main hazard of chlorine for the equipment is not an increase in system pressure drop, but rather equipment corrosion. The hydrochloric acid produced as a result of the hydrogenation reaction has a very high concentration when it comes into contact with the first drop of water; if the amount of water injected is low, the corrosion becomes quite severe. Chloride ions have strong penetration power, and the protective film formed by iron oxide has no effect on them.

Can ammonia be added first to produce ammonium chloride crystals, and after removing those crystals, can the gasoline be fed into the device?