Basell Polyolefine Gmbh

Other

Basf Aktiengesellschaft

Elenac Gmbh

Hans-Jacob Feindt

Kaspar Evertz

Rainer Karer

Philipp Rosendorfer

Wolfgang Micklitz

Manfred Hecker

Peter Bauer

Peter Kölle

Armin Lange

Paulus De Lange

Shahram Mihan

G&uuml;nther Schweier

Stefan Bitterlich

Günther Schweier

Thomas Letzelter

Peter K&ouml;lle

Thomas Brauch

Michael K&auml;mmerer

Gas-phase fluidized-bed reactor for polymerizing ethylenically unsaturated monomers, comprising a reactor chamber () in the form of a vertical tube, if desired a calming zone () following the upper section of the reactor chamber, a circulation gas line (), a circulation gas compressor () and a cooling device (), where, in the region of transition of the reaction gas from the circulation gas line into the reactor chamber and in the lower section of the reactor chamber itself, there is either no gas distributor plate at all or only a gas distributor plate the total surface area of whose gas orifices is more than 20% of the total surface area of said gas distributor plate.

Gaseous phase fluidized-bed reactor

Method of metering at least one solid, particulate catalyst into a reactor containing a fluidized bed () of particles in an at least partly gaseous medium, in which the catalyst is metered discontinuously at prescribed time intervals into the fluidized bed () at at least one metering point (). According to the present invention, a fluid stream is firstly introduced into the reactor () so that a region having a reduced particle density is formed in the fluidized bed () around the metering point () and the catalyst is subsequently metered into this region. As a result of the prior introduction of a fluid stream ('preblowing') before the actual introduction of the catalyst, the catalyst can penetrate significantly deeper into the fluidized bed from the metering point due to the reduced particle density and is dispersed better.

Discontinuous metering of catalysts and process auxilliaries into a gas-phase fluidized-bed reactor

A continuous vapor-phase fluidized-bed process for the preparation of ethylene homopolymers and copolymers having a density of from 0.87 to 0.97 g/cmin which ethylene or mixtures of ethylene and C-Ca-monoolefins are (co)polymerized in the presence of a supported chromium catalyst in the polymerization zone of a vapor-phase fluidized-bed reactor under pressures ranging from 1 to 100 bar and at temperatures ranging from 30&#xb0; to 125&#xb0; C. in the vapor phase in an agitated bed of bulk material comprising particulate polymer, the resultant heat of polymerization is removed by cooling the recirculated reactor gas and the resulting (co)polymer is removed from the vapor-phase fluidized-bed reactor, wherein, for the preparation of a (co)polymer of a specific density d, the (co)polymerization is carried out at a temperature which is in a range restricted by an upper envelope defined by equation Iand a lower envelope defined by equation IIin which the variables have the following meanings:

Vapor-phase fluidized-bed process and ethylene homopolymers and copolymers produced thereby

Method for the discontinuous thermal treatment of catalyst material

Gas phase fluidized bed method and ethylene homo- and copolymers obtained using said method

A method for the treatment of catalyst or catalyst support material in an apparatus in which the treatment is carried out continuously in such a way that the physical and/or chemical conditions change during entry of the catalyst or catalyst support material into the apparatus and/or during exit thereof from the apparatus and/or the catalyst or catalyst support material is transported in the apparatus through zones ( ) having different physical and/or chemical conditions.

Method and apparatus for the continuous treatment of catalyst and catalyst support material

Method for isolating olefins from polyolefin plants

In a continuous gas-phase polymerization process for preparing ethylene and propene homopolymers and copolymers, in which ethylene, propene or a mixture of ethylene or propene and C,-C,-&agr;-monoolefins is polymerized in the polymerization zone of a gas-phase polymerization reactor at from 30 to 125&deg; C. and a pressure of from 1 to 100 bar in the gas phase in a bed of finely divided polymer in the presence of a catalyst, where the reactor gas is circulated to remove the heat of polymerization, polymer deposits in the circulating gas line are prevented by metering a catalyst poison having a boiling point above the maximum temperature within the circulating gas line into this circulating gas line in at most such an amount that it does not significantly impair the productivity of the catalyst in the reactor.

Continuous gas-phase polymerization process

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Raritan Township, NJ, United States of America

Hans-Jacob Feindt