Basell Polyolefine Gmbh

Jörg Halpap

Rainer Karer

Manfred Hecker

Paulus De Lange

Klaus Berhalter

Cyrus Ahmadzade-Youssefi

Eberhard Herrmann

Axel Sperber

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.

Apparatus for the gas-phase polymerization of olefins, in particular ethylene

Apparatus for the polymerization of olefins, in particular ethylene, comprising a gas-phase fluidized-bed reactor (), a product offtake line () for taking polymer particles either continuously or discontinuously from the reactor (), which line () is connected to a depressurization vessel () for separating polymer particles and gas, a recycle gas filter () for freeing the gas of entrained fine particles connected to the depressurization vessel (), a compressor which compresses the gas which has been freed of fine particles and recirculates it into the reactor (), with the recycle gas filter () having an inlet chamber () provided with a gas inlet (), an outlet chamber () provided with a gas outlet (), an essentially vertical sheet-like filter medium () for retaining the fine particles which separates the inlet chamber () from the outlet chamber () and a particle outlet (). The inlet chamber () has a dividing wall () which is arranged essentially parallel to the filter medium () and separates the inlet chamber () into an inflow region (), which is connected to the gas inlet (), and a filter region () in which the filter medium is located and has an upper opening and a lower opening which are dimensioned so that from 60 to 90% of the volume flow flows through the upper opening so that flow along the filter medium () from the top downward results.

Apparatus and process for the gas-phase polymerization of olefins

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Bockelwitz, Germany

Jörg Halpap