Method for separating olefin oligomerization products (variants)

A method of separating olefin oligomerization products, the method comprising the following sequence of steps:

• a) discharging a reaction mass from an oligomerization reactor;
• b) contacting the reaction mass with a catalyst system deactivating agent;
• c) isolating a fraction comprising an initial olefin from the reaction mass to form a stream of the fraction comprising the initial olefin and an oligomerization reaction product stream;
• c)* directing a first part of the oligomerization reaction product stream from step c) into a separation column;
• and directing a second part of the oligomerization reaction product stream from step c) to an evaporator in step d);
• d)* separating the first part of the oligomerization reaction product stream from step c) in the separation column into a light fraction, a fraction of a target α-olefin, and a heavy fraction of oligomers, followed by directing the heavy fraction of oligomers to the evaporator in(step d);
• d) separating, in the evaporator, the heavy fraction of oligomers from step d)* and the second part of the oligomerization reaction product stream into a fraction predominantly comprising the target α-olefin, and a fraction comprising a by-product polymer and catalyst system residues;
• e) directing the fraction predominantly comprising the target α-olefin obtained in step d) and the first part of the oligomerization reaction product stream from step c) into the separation column, for the separating in step d)* into the light fraction, the fraction of the target α-olefin, and the heavy fraction of oligomers.