FIELD: chemistry.
SUBSTANCE: invention relates to a method of treating oil for pyrolysis of plastics, involving: a) a step for selective hydrogenation of said feedstock in the presence of hydrogen and at least one selective hydrogenation catalyst, at temperature of 100 to 150 °C, hydrogen partial pressure from 1.0 to 10.0 MPa abs. and hourly space velocity from 1.0 to 10.0 h-1 to obtain a hydrogenated stream; b) a step for hydrotreating said hydrogenated stream in the presence of hydrogen and at least one hydrotreating catalyst at temperature of 250 to 370 °C, hydrogen partial pressure from 1.0 to 10.0 MPa abs. and hourly space velocity from 0.1 to 10.0 h-1 to obtain a hydrotreated stream; c) a step of separating the hydrotreated stream leaving step b) in the presence of an aqueous stream, said step being carried out at temperature of 50 to 370 °C to produce at least a gas stream, a water stream and a hydrocarbon stream. Said separation step c) involves introduction of an aqueous solution into the hydrotreated stream leaving step b) before the washing/separation section.
EFFECT: improved yield of light olefins at the steam cracking stage with simultaneous reduction, in particular, of the risks of clogging at the stages of processing oils of pyrolysis of plastics.
12 cl, 3 ex, 12 tbl, 3 dwg
