Abstract: Disclosed is a method for producing a polyolefin including: (1) a step (1) of polymerizing one or more olefins in solution polymerization or slurry polymerization in the presence of a polymerization catalyst to produce a polymer solution, (2) a step (2) of taking out the polymer solution obtained in the step (1), and adding a catalyst deactivator in the polymer solution to deactivate the polymerization catalyst, and (3) a step (3) of removing volatile components in vacuum from the polymer solution where the polymerization catalyst has been deactivated, and including, between the step (2) and the step (3), a step of adding an additive to the polymer solution when the water concentration in the polymer solution is 5 ppm by mass or less.

Abstract: Disclosed is a method for producing a polyolefin including: (1) a step (1) of polymerizing one or more olefins in solution polymerization or slurry polymerization in the presence of a polymerization catalyst to produce a polymer solution, (2) a step (2) of taking out the polymer solution obtained in the step (1), and adding a catalyst deactivator in the polymer solution to deactivate the polymerization catalyst, and (3) a step (3) of removing volatile components in vacuum from the polymer solution where the polymerization catalyst has been deactivated, and including, between the step (2) and the step (3), a step of adding an additive to the polymer solution when the water concentration in the polymer solution is 5 ppm by mass or less.

Abstract: A method for stirring resin pellets, which includes stirring adhesive resin pellets in a liquid in a stirring tank equipped with a stirring impeller, under the condition satisfying the following relational expression (I): ? ? ? ( Np 1 / 3 ? nD ) 2 ? ? ? pgdp ? 10 ( I ) wherein ? is the density of the liquid (kg/m3), Np is the power number of the stirring impeller, n is the rotational speed (1/s), D is the diameter of the stirring impeller (m), ?? is the difference in density between the resin pellets and the liquid (kg/m3), g is the gravitational acceleration (m/s2), and dp is the particle diameter of the resin pellets (m).

Abstract: A method for stirring resin pellets, which includes stirring adhesive resin pellets in a liquid in a stirring tank equipped with a stirring impeller, under the condition satisfying the following relational expression (I): ? ? ? ( Np 1 / 3 ? nD ) 2 ? ? ? pgdp ? 10 ( I ) wherein ? is the density of the liquid (kg/m3), Np is the power number of the stirring impeller, n is the rotational speed (1/s), D is the diameter of the stirring impeller (m), ?? is the difference in density between the resin pellets and the liquid (kg/m3), g is the gravitational acceleration (m/s2), and dp is the particle diameter of the resin pellets (m).

Abstract: A method for producing an olefin oligomer mixture comprising: feeding a raw olefin oligomer mixture to a first evaporator; feeding a residue which is taken out from the first evaporator to a second evaporator, and returning a distillate which is distilled from the second evaporator to the first evaporator; taking a distillate out from the first evaporator; feeding a residue which is taken out from the second evaporator to a third evaporator; and taking a distillate out from the third evaporator.