FIELD: chemistry.
SUBSTANCE: invention relates to method for separation of at least one oligomerised output flow. Method includes the following stages at which: A) water-washed raw material flow, containing water and C3 and C4 hydrocarbons, is divided into flow, containing water and C3 hydrocarbons and flow, containing C4 hydrocarbons; B) said flow, containing water and C3 hydrocarbons, is dried in drier to remove water and obtain water-depleted flow, containing C3 hydrocarbons; C) said water-depleted flow, containing C3 hydrocarbons, is introduced into first zone of liquid-phase oligomerisation to obtain first output flow, containing C9 hydrocarbons, C12 hydrocarbons, or their combination; D) said flow, containing C4 hydrocarbons, is introduced into second zone of liquid-phase oligomerisation to obtain second output flow, containing C8 hydrocarbons, C12 hydrocarbons, or their combination, with recirculating flow of C8+ hydrocarbons being introduced into second zone of liquid-phase oligomerisation; E) at least part of said first output flow and/or said second output flow is supplied into separation zone; and F) at least one flow from said separation zone is supplied into hydroprocessing zone.
EFFECT: application of the claimed invention makes it possible to produce high-quality high-octane gasoline in rational and effective way.
10 cl, 4 dwg
