Patent ID: 7291685

Claim:
A process for producing an α-olefin oligomer by subjecting ethylene to an oligomerization reaction in a reactor in the presence of a Ziegler catalyst and a hydrocarbon-based solvent, comprising the step of spraying the hydrocarbon-based solvent in the form of a linear or bar-shaped pressure fluid, at a pressure 0.3 to 1.0 MPa higher than the pressure within the reactor, toward a wall surface of a vapor phase portion of the reactor from a nozzle fitted within a space of the vapor phase portion of the reactor to conduct the oligomerization reaction while cleaning the wall surface of the vapor phase portion of the reactor, keeping a distance between the nozzle and the wall surface of no more than 20 cm, wherein the linear or bar-shaped pressure fluid consists of the hydrocarbon-based solvent.