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AssigneeBasell Polyolefine Italia S.R.L.
InventorsRiccardo Rinaldi, Antonio Mazzucco, Enrico Balestra, Giuseppe Penzo, Maurizio Dorini, Gabriele Mei
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A process for the polymerisation of olefins carried out in a gas-phase reactor having interconnected polymerization zones, where the growing polymer particles flow upward through a first polymerization zone (riser) under fast fluidization or transport conditions, leave said riser and enter a second polymerization zone (downcomer) through which they flow downward under the action of gravity, leave said downcomer and are reintroduced into the riser, a gas recycle stream being withdrawn from said first polymerisation zone, subjected to cooling below its dew point and then returned to said first polymerisation zone, the process being characterised in that said gas recycle stream is cooled at a temperature Tc ranging from 0.05° C. to 3° C. below its dew point.
A process for the polymerization of olefins comprising polymerizing monomers in a gas-phase reactor having interconnected polymerization zones, where the growing polymer particles flow upward through a first polymerization zone (riser) under fast fluidization or transport conditions, leave said riser and enter a second polymerization zone (downcomer) through which they flow downward under the action of gravity, leave said downcomer and are reintroduced into the riser, a gas recycle stream being withdrawn from said first polymerisation zone, subjected to cooling below its dew point, thereby partially condensing the gas recycle stream to form a liquid, and then returned to said first polymerisation zone, wherein the gas recycle stream is cooled at a temperature Tc ranging from 0.05° C. to 3° C. below its dew point.
Dependencies are inferred from the claim text.