Corrosion inhibitor used for oil refining equipment as well as preparation method and application of corrosion inhibitor

The invention belongs to the technical field of corrosion inhibitors and specifically relates to a corrosion inhibitor used for oil refining equipment as well as a preparation method and application of the corrosion inhibitor. The preparation method comprises the following steps: adding 40-70wt% of ricinoleic acid and 30-60wt% of organic amine into a reaction kettle, heating the reaction kettle to120-150 DEG C at normal temperature, performing a reaction at constant temperature for 2-5h, adding 1-5wt% of benzene into the reaction kettle and continuously maintaining the temperature until watergenerated by the reaction is completely removed; adding 20-30wt% of glacial acetic acid into the reaction kettle when the temperature of the reaction system is reduced to below 50 DEG C, heating thereaction kettle to 120-150 DEG C, performing a reaction at constant temperature for 2-5h until no water is removed, reducing the temperature to below 100 DEG C, and uniformly mixing a reaction productand a diluent, so as to obt