US 12,139,565 B2
Polymerization process
Mohammad Al-haj Ali, Porvoo (FI); Mubashar Sattar, Porvoo (FI); Noureddine Ajellal, Porvoo (FI); Henry Sleijster, Geleen (NL); and Charlotta Weber, Stockholm (SE)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 17/624,449
Filed by Borealis AG, Vienna (AT)
PCT Filed May 18, 2020, PCT No. PCT/EP2020/063795
§ 371(c)(1), (2) Date Jan. 3, 2022,
PCT Pub. No. WO2021/004684, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 19185004 (EP), filed on Jul. 8, 2019.
Prior Publication US 2022/0348702 A1, Nov. 3, 2022
Int. Cl. C08F 10/02 (2006.01); B01D 1/06 (2006.01); B01D 3/14 (2006.01); B01D 5/00 (2006.01); C08F 6/00 (2006.01); C08F 210/00 (2006.01)
CPC C08F 210/00 (2013.01) [B01D 3/148 (2013.01); B01D 5/006 (2013.01); C08F 6/003 (2013.01); B01D 1/06 (2013.01); B01D 5/0012 (2013.01); C08F 10/02 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A polymerization process, comprising
polymerizing an olefin monomer and a comonomer in the presence of a polymerization catalyst in a polymerization step conducted in a polymerization reactor in a solvent to produce a solution comprising a polymer of the olefin monomer and the comonomer;
withdrawing an exhaust stream of the solution from the polymerization reactor in a withdrawing step;
separating the exhaust stream to a first primary stream and a primary concentrated solution stream in a first primary separation step, wherein the first primary stream comprises hydrocarbons and polymer;
separating the first primary stream to a second primary stream and a third primary stream in a second primary separation step, wherein the second primary stream comprises dissolved polymer and the third primary stream comprises majority of the hydrocarbons;
cooling the third primary stream to a temperature of −80 to 20° C. in a primary cooling step to obtain a cooled third primary stream;
separating the cooled third primary stream to a fourth primary stream and a fifth primary stream in a third primary separation step, wherein the fourth primary stream comprises hydrocarbons in vapour phase and the fifth primary stream comprises liquid hydrocarbons; and
returning the fourth primary stream and the fifth primary stream independently in a primary returning step to a location upstream of the polymerization reactor.