US 12,202,924 B2
Method for separating polybutene
Woo Sung Hwang, Daejeon (KR); Jeong Seok Lee, Daejeon (KR); Won Hee Kim, Daejeon (KR); Hye Mi Kim, Daejeon (KR); Gyeong Shin Choi, Daejeon (KR); and Dong Hyun Jo, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/291,955
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jan. 17, 2020, PCT No. PCT/KR2020/000851
§ 371(c)(1), (2) Date May 6, 2021,
PCT Pub. No. WO2020/149690, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 10-2019-0007026 (KR), filed on Jan. 18, 2019.
Prior Publication US 2022/0025079 A1, Jan. 27, 2022
Int. Cl. C08F 6/04 (2006.01); B01D 3/14 (2006.01); C08F 6/00 (2006.01); C08F 6/10 (2006.01); C08F 6/12 (2006.01); C08F 10/08 (2006.01); C08F 110/10 (2006.01)
CPC C08F 6/12 (2013.01) [B01D 3/148 (2013.01); C08F 6/001 (2013.01); C08F 6/04 (2013.01); C08F 10/08 (2013.01); C08F 110/10 (2013.01)] 14 Claims
OG exemplary drawing
 
1. 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.