The invention discloses a
system and a method for producing biological
aviation kerosene by using
waste oil and belongs to the technical field of biological
aviation kerosene preparation. The method comprises the following steps: (1) the waste
grease and a magnetic catalyst loaded with
ionic liquid are mixed and enter a suspended
bed pre-hydrogenation reactor for reaction to obtain a pre-hydrogenation product, a carrier in the magnetic catalyst loaded with the
ionic liquid is Fe3O4 magnetic particles coated with a
silicon dioxide layer, and the
ionic liquid is
molybdenum-based ionic liquid; (2) separating the pre-hydrogenation product to obtain a primary hydrogenation product; (3) performing hydrogenation upgrading on the primary hydrogenation product to obtain an upgraded
intermediate product; (4) separating the upgrading
intermediate product to obtain a secondary hydrogenation upgrading product; and (5) carrying out hydroisomerization reaction on the secondary hydrogenation upgrading product to obtain the biological
aviation kerosene. According to the method, the magnetic catalyst loaded with the ionic liquid is adopted to catalyze the waste
grease, recycling can be achieved under the action of a
magnetic field, the catalytic stability is high, and industrial stable production can be achieved without supplementing the catalyst.