Gas-Phase Process for the Poymerization of Olefins
AssigneeBasell Poliolefine Italia S.r.l.
InventorsJoachim Pater T.M., Pietro Baita, Gabriele Mei, Antonio Mazzucco
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Abstract
A process for the gas-phase polymerization of one or more alpha-olefins in the presence of a polymerization catalyst system, the process comprising: a) contacting in a continuous way a gas comprising one or more of said alpha-olefins with said catalyst system in a gas-phase tubular reactor at a temperature from 30° C. to 130° C. in order to obtain a polymerization degree up to 500 grams per gram of catalyst system; b) feeding in continuous the prepolymer from step a) to a successive gas-phase polymerization reactor; wherein said gas-phase tubular reactor has a length/diameter ratio higher than 100.
Claims15
A process for the gas-phase polymerization of one or more alpha-olefins in the presence of a polymerization catalyst system, the process comprising:
- a) contacting in a continuous way a gas comprising one or more of said alpha-olefins with said catalyst system in a gas-phase tubular reactor at a temperature from 30° C. to 130° C. in order to obtain a polymerization degree up to 500 grams per gram of catalyst system;
- b) feeding in continuous the prepolymer from step a) to a successive gas-phase polymerization reactor;
- wherein said gas-phase tubular reactor has a length/diameter ratio higher than 100.
An apparatus for the gas-phase polymerization of α-olefins comprising a sequence of a gas-phase tubular prepolymerization reactor and one or more gas-phase polymerization reactors, said tubular prepolymerization reactor having a length/diameter ratio higher than 100 and comprising at least a facility for feeding a reaction gas, at least a facility for feeding catalyst components, at least a facility for transferring the formed prepolymer to said one or more gas-phase polymerization reactors, and optionally a facility for separating the reaction gas from the prepolymer particles and recirculating said reaction gas to the inlet region of said tubular reactor.
Dependencies are inferred from the claim text.