Method and equipment for continuous deep deacidification of petroleum distillate oil

The invention relates to a method and equipment for continuously and deeply deacidifying petroleum distillate oil, which are characterized in that two settling tanks, an extraction tower, two mixers, a pump, a solvent recovery system and a deacidified oil evaporation recovery system are used, and ammonia, water and C-C3 alcohols are used for preparing a deacidification agent. Raw oil and a rich deacidification agent from a settling tank B are mixed through a mixer and then enter a settling tank A, primary deacidification oil from the settling tank A and a deacidification agent from a deacidification agent tank are mixed through the mixer and then enter the settling tank B, and a deacidification agent solution from the settling tank A and a back extractant enter an extraction tower; a solution at the bottom of the extraction tower enters a solvent recovery system to recover a solvent and obtain high-purity naphthenic acid, and deacidified oil liquid from the settling tank B enters a deacidified oil evaporation