公开(公告)号：US10604595B2

公开(公告)日：2020-03-31

申请号：US15776089

申请日：2016-12-21

Applicant: Borealis AG

Inventor： Mohammad Al-Haj Ali ,  Erik Eriksson ,  Sameer Vijay ,  Guhan Mathivanan ,  Jukka Rasanen ,  Henry Sleijster ,  Christof Wurnitsch ,  Samuli Zitting

IPC: C08F6/12 ,  C08F6/00 ,  B01J8/00 ,  C08L23/02

Abstract: A process for withdrawing polyolefins from a reactor includes: continuously withdrawing a liquid solution stream from a solution polymerization reactor and passing the liquid solution stream into a low pressure separator; withdrawing a first vapour stream and a first liquid stream from the separator and passing the first vapour stream into a washing column; withdrawing a second vapour stream from the washing column and feeding it via a condenser line to a condenser; cooling the second vapour stream in the condenser so that part of the second vapour stream condenses, producing a condensed second vapour stream and an uncondensed second vapour stream; passing the condensed second vapour stream to an upper part of the washing column via a reflux line; withdrawing a second liquid stream from the washing column and passing at least part of the second liquid stream to the separator via a recycling line; and recovering heat.

公开(公告)号：US20180327529A1

公开(公告)日：2018-11-15

申请号：US15776095

申请日：2016-12-21

Applicant: Borealis AG

Inventor： Henry Sleijster ,  Mohammad Al-Haj Ali ,  Jukka Rasanen ,  Samuli Zitting ,  Michiel Bergstra ,  Erik Eriksson ,  Christof Wurnitsch ,  Guhan Mathivanan ,  Sameer Vijay ,  Vasileios Kanellopoulos ,  Jani Aho ,  Jouni Takakarhu

IPC: C08F210/14 ,  C08F210/02 ,  C08J11/02

Abstract: An in-line blending process for polymers comprising: (a) providing two or more reactor-low pressure separator units (1,7) in parallel configuration, each reactor-low pressure separator unit comprising one reactor (2,8) fluidly connected to one low pressure separator (3,9) downstream and further a recycling line (5,11) connecting the low pressure separator (3,9) back to the corresponding reactor (2,8); (b) polymerizing olefm monomers having two or more carbon atoms in each of the reactors (2,8) in soltion polymerisation; (c) forming an unreduced reactor effluents stream including a homogenous fluid phase polymer-monomer-solvent mixture in each of the reactors (2,8), (d) passing the unreduced reactor effluents streams from each of the reactors (2,8) through the corresponding low pressure separators (3,9), whereby the temperature and pressure of the low pressure separators (3,9) is adjusted such that a liquid phase and a vapour phase are obtained, whereby yielding a polymer-enriched liquid phase and a polymer-lean vapour phase, and (e) separating the polymer-lean vapour phase from the polymer-enriched liquid phase in each of the low-pressure separators (3,9) to form separated polymer-lean vapour streams and separated polymer-enriched liquid streams; (f) combining the polymer-enriched liquid streams from step (e) in a further low-pressure separator and/or a mixer (13) to produce a combined polymer-enriched liquid stream (16); (g) reintroducing the polymer-lean vapour streams from step (e) via recycling lines (5,11) into the corresponding reactors (2,8).