FIELD: chemistry.
SUBSTANCE: invention relates to the method for producing olefins, comprising: cracking hydrocarbon on the FCC catalyst in the FCC area with the receipt of the spent catalyst from the FCC and the flow of products of cracking; and receiving the feed flow to the oligomerization containing hydrocarbons C4 and C5 from the said flow of products of cracking; supplying the specified feed flow in the oligomerization zone for the oligomerization of olefins in the raw material flow in the liquid phase with obtaining the flow of oligomerate; and splitting the specified flow of oligomerate in the debutanizer on the first flow containing C4 hydrocarbons and the second flow containing hydrocarbons C5+. The pressure in the upper part of the debutanizer column is from 300 to 350 kPa (exc.), and the temperature in the lower part is from 250° to 300°C; the separation of the second flow containing hydrocarbons C5+ in the depentanizer for obtaining an intermediate flow comprising hydrocarbons C5 and a liquid product flow of oligomerate containing hydrocarbons C6+, and the pressure in the upper part of the depentanizer column is from 10 to 60 kPa (exc.) and the temperature in the lower part is from 225° to 275°C and the recycling of the intermediate flow comprising hydrocarbons C5 in the specified oligomerization zone to maintain the liquid phase.
EFFECT: use of the present invention makes it possible to reduce the oligomerization to a heavier material, which makes it possible to increase the amount of pure gasoline obtained.
9 cl, 13 dwg, 17 tbl, 9 ex
