US 12,290,803 B2
Process and a multi-stage reactor assembly for the production of polyolefins
Apostolos Krallis, Porvoo (FI); Vasileios Kanellopoulos, Linz (AT); Erno Elovainio, Porvoo (FI); Klaus Nyfors, Linz (AT); and Joana Kettner, Linz (AT)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 17/616,433
Filed by Borealis AG, Vienna (AT)
PCT Filed Apr. 6, 2020, PCT No. PCT/EP2020/059810
§ 371(c)(1), (2) Date Dec. 3, 2021,
PCT Pub. No. WO2020/244833, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 19178245 (EP), filed on Jun. 4, 2019.
Prior Publication US 2022/0234021 A1, Jul. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 10/02 (2006.01); B01J 8/08 (2006.01); B01J 8/18 (2006.01); B01J 8/24 (2006.01); B01J 19/24 (2006.01); C07F 3/02 (2006.01); C07F 7/28 (2006.01); C08F 2/00 (2006.01); C08F 2/01 (2006.01); C08F 210/06 (2006.01)
CPC B01J 8/24 (2013.01) [B01J 8/08 (2013.01); B01J 8/1827 (2013.01); B01J 8/1854 (2013.01); B01J 19/2435 (2013.01); C07F 3/02 (2013.01); C07F 7/28 (2013.01); C08F 2/001 (2013.01); C08F 2/01 (2013.01); C08F 210/06 (2013.01); B01J 2219/1943 (2013.01); C08F 10/02 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A process for the production of polyolefins comprising:
a) feeding a slurry comprising at least one polymerization catalyst, at least one carrier liquid, first olefin monomer(s) and optionally at least one first comonomer into at least one loop reactor;
b) polymerizing the first olefin monomer(s) and optionally the at least one first comonomer yielding a first polyolefin;
c) withdrawing the first polyolefin from the at least one loop reactor;
d) feeding the first polyolefin to at least one gas-solids olefin polymerization reactor, wherein the at least one gas-solids olefin polymerization reactor comprises:
a top zone (1);
a middle zone (2), which comprises a top end in direct contact with said top zone and which is located below said top zone (1), the middle zone (2) having a generally cylindrical shape; and
a bottom zone (3), which is in direct contact with a bottom end of the middle zone (2) and which is located below the middle zone (2);
e) introducing a fluidization gas (FG) stream into the bottom zone (3) of the at least one gas-solids olefin polymerization reactor;
f) polymerizing second olefin monomer(s) and optionally at least one second comonomer in the presence of the at least one polymerization catalyst and the first polyolefin to a second polyolefin in a dense zone (4) formed by particles of said second polyolefin suspended in an upward flowing stream of fluidization gas in the middle zone (2);
g) introducing a jet gas (JG) stream through one or more jet gas feeding ports (5) in a jet gas feeding area of the middle zone (2) at the dense zone (4) in the middle zone (2) of the at least one gas-solids olefin polymerization reactor;
h) withdrawing the second polyolefin from the at least one gas-solids olefin polymerization reactor;
wherein the jet gas (JG) stream fed through at least one of the one or more jet gas feeding ports (5) is provided by a flash pipe (FP) from the at least one loop reactor.