The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 2020
Filed:
Nov. 22, 2016
Borealis Ag, Vienna, AT;
Kauno Alastalo, Porvoo, FI;
Mohammad Al-Haj Ali, Helsinki, FI;
Vasileios Kanellopoulos, Linz, AT;
Apostolos Krallis, Espoo, FI;
BOREALIS AG, Vienna, AT;
Abstract
A process for polymerising alpha-olefin monomers in a loop reactor comprising the steps of introducing a main feed stream () comprising at least one alpha-olefin monomer into the loop reactor (); introducing a polymerisation catalyst into the loop reactor (); polymerising the at least one alpha-olefin monomer in the presence of the polymerisation catalyst in the loop reactor () to produce a slurry comprising polyolefin particles; withdrawing an outlet stream () comprising at least a portion of the slurry from the loop reactor (); adding a first feed stream () comprising the at least one alpha-olefin monomer and/or hydrogen to the outlet stream () to form a concentrator inlet stream (); introducing the concentrator inlet stream () into a concentrator (); withdrawing from the concentrator () an overflow stream () comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the overflow stream () is smaller than in the concentrator inlet stream (); withdrawing from the concentrator () a bottom outlet stream () comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the bottom outlet stream () is greater than in the concentrator inlet stream (); returning the overflow stream () into the loop reactor () in an area different from that from which the outlet stream () is withdrawn.