METHOD OF SEPARATING STREAM LEAVING OLIGOMERISATION STEP Russian patent published in 2024 - IPC C07C2/30 C07C11/08 C07C7/04 C07C7/09 C07C7/148 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of treating a stream leaving an oligomerisation step, which includes a step for neutralizing said stream in order to deactivate a catalyst composition and a subsequent step for thermal separation of the neutralized stream. Method includes: first evaporation stage, performed at pressure from 2.0 to 5.0 MPa and temperature from 70 to 150 °C, which enables to obtain a liquid fraction sent to the second evaporation step, and a gaseous fraction, preferably sent to the distillation section, said second evaporation step carried out at pressure of 0.5 to 3.0 MPa and temperature of 70 to 150 °C, which enables to obtain a liquid fraction and a gaseous fraction, and said gaseous fraction is preferably directed to the distillation section, wherein the pressure at the first evaporation stage is higher than the pressure at the second evaporation stage by at least 0.5 MPa.

EFFECT: use of the disclosed method increases production of the desired olefins and limits costs associated with maintenance of production plants.

16 cl, 3 tbl, 2 ex