The invention belongs to the field of
petrochemical engineering, and relates to a novel method for removing non-alkaline
nitrogen-indole in an oil product through
ionic liquid. The novel method is characterized in that SO3H-containing functionalized acidic
ionic liquid is used as a catalyst and a
solvent, and the operation can be carried out at lower temperature (20 to 70 DEG C); and after the reaction, the recovered
ionic liquid can be reused by being simply treated. Compared with the conventional method, the novel method provided by the invention has following characteristics that (1) the conventional strong acid
nitrogen removal and hydrogenation
nitrogen removal in the background technology are not needed, so that the problems due to the
corrosion of the equipment, the
wastewater drainage, and the high price of equipment, can be greatly reduced; (2) the adopted ionic liquid is the water-soluble ionic liquid which can be layered well respect to a simulated oil product after being dissolved by water in a certain proportion, and thus the convenience is provided for the separation after the
nitrogen removal treatment; and (3) the implemented
liquid nitrogen removal method is mild in condition, the operation is simple and easy to carry out, the ionic liquid can be reused, and the problem in the background technology that the catalyst cannot be recycled can be avoided.