Gas-phase polymerization process with wet zone

摘要

The present disclosure is directed to a process for producing olefin-based polymer in a gas phase polymerization reactor. The process includes forming a wet zone in the gas phase polymerization reactor. The wet zone is formed by maintaining a temperature less than or equal to the fluidizing medium dew point temperature+2° C. in a region of the reactor. The region is defined as the region extending from the distributor plate to 2.5 meters above the distributor plate. Injection of a high activity catalyst composition in the wet zone produces olefin-based having a settled bulk density greater than 23.5 lb/ft3.

主权项

1. A process for producing olefin-based polymer comprising:
providing a gas phase polymerization reactor comprising a distributor plate and a fluidizing medium having a dew point temperature (DPT), the fluidizing medium comprising one or more olefin monomers and from 5 wt % to 25 wt % of a condensed liquid; forming, in the reactor, a wet zone by maintaining a temperature less than or equal to the DPT+2° C. in a region in the reactor defined as extending from the distributor plate to 2.5 meters above the distributor plate; injecting a catalyst composition into the wet zone, the catalyst composition having a catalyst activity greater than 50 ton/kg; contacting, in the wet zone under gas phase polymerization conditions, the catalyst composition with the one more monomers of the fluidizing medium; and forming particles of olefin-based polymer having a settled bulk density greater than 23.5 lb/ft3.