Method for separating polybutene

A method for separating polybutene, the method comprising:

• (1) introducing a polybutene solution into a distillation column, wherein the polybutene solution comprises polybutene, a halogenated hydrocarbon solvent, and a non-polar hydrocarbon solvent and the polybutene solution has a viscosity of 1 cp to 50 cp as measured at 25° C. using a rotational viscometer;
• (2) collecting an upper stream comprising the halogenated hydrocarbon solvent and a portion of the non-polar hydrocarbon solvent from an upper portion of the distillation column, and collecting a lower stream comprising the polybutene and a remaining portion of the non-polar hydrocarbon solvent from a lower portion of the distillation column, wherein the lower stream has a viscosity of 10 cp to 150 cp;
• and
• (3) separating the remaining portion of the non-polar hydrocarbon solvent and the polybutene from the lower stream,
• wherein a reflux ratio of the distillation column in Step (2) is 0.1 to 1.