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:
Sep. 07, 2021
Filed:
Dec. 15, 2016
Borealis Ag, Vienna, AT;
Mohammad Al-Haj Ali, Helsinki, FI;
Vasileios Kanellopoulos, Linz, AT;
Apostólos Krallis, Espoo, FI;
Klaus Nyfors, Porvoo, FI;
Pablo Ivan Aguayo Arellano, Pasching, AT;
Gunter Weickert, Ahaus, DE;
Eric-Jan Prinsen, Aadorp, NL;
Borealis AG, Vienna, AT;
Abstract
The present invention relates to a process and apparatus for withdrawing polymer agglomerates from a fluidised bed polymerisation reactor, the polymerisation reactor comprising a bottom zone having a generally conical shape and no fluidisation grid. The agglomerates are withdrawn by using an agglomerate trap below the bottom zone. A value of a process variable indicative of the content of agglomerates in the agglomerate trap is measured and the opening time of the valves transferring polymer to and from the agglomerate trap is adjusted based on the measured value.