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:
Aug. 24, 2010
Filed:
Nov. 09, 2005
Eberhard Herrmann, Frankental, DE;
Axel Sperber, Ludwigshafen, DE;
Manfred Hecker, Neustadt Wied, DE;
Rainer Karer, Kaiserlautern, DE;
Klaus Berhalter, Bornheim Dersdorf, DE;
Paulus DE Lange, Wesseling, DE;
Jörg Halpap, Bockelwitz, DE;
Cyrus Ahmadzade-youssefi, Köln, DE;
Eberhard Herrmann, Frankental, DE;
Axel Sperber, Ludwigshafen, DE;
Manfred Hecker, Neustadt Wied, DE;
Rainer Karer, Kaiserlautern, DE;
Klaus Berhalter, Bornheim Dersdorf, DE;
Paulus De Lange, Wesseling, DE;
Jörg Halpap, Bockelwitz, DE;
Cyrus Ahmadzade-Youssefi, Köln, DE;
Basell Polyolefine GmbH, Wesseling, DE;
Abstract
An apparatus for the polymerization of olefins, in particular ethylene, comprising a gas-phase fluidized-bed reactor (), a recycle gas line () connected to the reactor for discharging and recirculating the recycle gas stream comprising the unpolymerized olefin and a cyclone () located in the recycle gas line for the reduction and precipitation of the solid particles entrained in the recycle gas from the reactor, with the cyclone comprising an upper section () which has an essentially vertical central axis, whose wall extends along a rotationally symmetric body and which is provided with a cyclone inlet () arranged eccentrically relative to the central axis, a middle section () which adjoins the upper section () and whose wall extends along a rotationally symmetric body which tapers in a downward direction, a lower section () for discharging the solid particles precipitated from the recycle gas which adjoins the middle section () and whose wall extends along a rotationally symmetric body and a tube () extending essentially axially symmetrically down into the upper section and, if appropriate, the middle section for discharging the recycle gas which has been freed of the particles. According to the invention the ratio Hof the distance hfrom the lower end of the tube () extending downward into the cyclone to the intersection () of an imaginary extension of the wall of the downward-extending tube () with the wall of the middle section () to the diameter dof the downward-extending tube () is from 3 to 8, in particular from 4 to 7.