Basell Polyolefine Gmbh

Basf Aktiengesellschaft

Benno Knauer

Peter Hennenberger

Klaus Hilligardt

Horst Bullack

Eckard Schauss

Klaus Borho

Heinz Vogt

Farid Rizk

Alfred F Hauss

Ethylenically unsaturated monomers are polymerized in a gas-phase fluidized-bed reactor comprising a reactor space () in the form of a vertical tube, a calming zone () adjoining the upper part of the reactor space, a circulated gas line (), a circulated gas compressor (), a cooling apparatus (), a gas distributor plate () which forms the lower boundary of the reactor space and, if desired, a flow divider (), wherein the gas distributor plate () has a plurality of gas flow orifices () whose outlet sides are widened conically.

Gas-phase fluidized-bed reactor

Ethylenically unsaturated monomers are polymerized in a gas-phase fluidized-bed reactor comprising a reactor space ( ) in the form of a vertical tube, a calming zone ( ) adjoining the upper part of the reactor space, a circulated gas line ( ), a circulated gas compressor ( ), a cooling apparatus ( ), a gas distributor plate ( ) which forms the lower boundary of the reactor space and, if desired, a flow divider ( ), wherein the gas distributor plate ( ) has a plurality of gas flow orifices ( ) whose outlet sides are widened conically.

Ethylene/.alpha.-olefin copolymers are prepared by catalytic dry-phase copolymerization of the monomers in a stirred or fluidized polymerization zone, transfer of the resulting mixture of solid copolymer and unconverted gaseous monomer into a let-down zone and separation of the mixture, after pressure reduction, into a gaseous phase and a solid phase, by a continuous process in which the solid phase is continuously flushed beforehand with gaseous ethylene and then flushed with a mixture of nitrogen and steam. The ethylene copolymers are very substantially free of residual monomers and odor and flavor substances.

Low pressure copolymerization of ethylene with .alpha.-olefins and

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Ludwigshafen, Germany

Benno Knauer