US 9,809,659 B2
Ethylene polymerization process having improved heat exchanger performance
Giuseppe Penzo, Ferrara (IT); Rodrigo Carvajal, Bonn (DE); Reinhard Kuehl, Bornheim (DE); and Elke Damm, Bad Vilbel (DE)
Assigned to Basell Polyolefine GmbH, Wesseling (DE)
Appl. No. 15/321,152
Filed by Basell Polyolefine GmbH, Wesseling (DE)
PCT Filed Jun. 22, 2015, PCT No. PCT/EP2015/063996
§ 371(c)(1), (2) Date Dec. 21, 2016,
PCT Pub. No. WO2015/197561, PCT Pub. Date Dec. 30, 2015.
Claims priority of application No. 14173958 (EP), filed on Jun. 25, 2014.
Prior Publication US 2017/0204206 A1, Jul. 20, 2017
Int. Cl. C08F 10/02 (2006.01); C08F 2/01 (2006.01); C08F 2/12 (2006.01); C08F 2/14 (2006.01); C08F 2/18 (2006.01); B01J 19/18 (2006.01)
CPC C08F 10/02 (2013.01) [C08F 2/01 (2013.01); C08F 2/12 (2013.01); C08F 2/18 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A process for the preparation of polyethylene by polymerizing in a slurry ethylene and optionally one or more C3 to C10 alpha-olefins at a temperature from 60° C. to 95° C. and a pressure from 0.15 MPa to 3 MPa in a reactor system comprising a polymerization reactor and one or more first heat exchangers located outside the polymerization reactor, where the slurry in the polymerization reactor is cooled by withdrawing slurry from the polymerization reactor, cooling the slurry in the one or more first heat exchangers and returning the cooled slurry to the polymerization reactor, wherein the one or more first heat exchangers are cooled by a first coolant having a temperature of 29° C. or higher, and wherein the temperature in the polymerization reactor is maintained by adjusting the flow rate of the first coolant through the one or more first heat exchangers.