Abstract: An apparatus and method for continuous polymerization of olefin(s), and a method for transferring a polymer powder from one reactor to another in the apparatus are disclosed. The apparatus includes a plurality of serially disposed gas-phase polymerization reactors including a combination of an upstream and downstream reactors and a gas exchange vessel disposed between both reactors. The gas exchange vessel is connected to the upstream and downstream reactors by a first and second transfer conduits, respectively. The gas exchange vessel has a gas distributor plate therein which partitions the gas exchange vessel into an upper section having a gas exchange chamber and a lower section. In the gas exchange chamber, the gas transferred from the upstream reactor together with a polymer powder is exchange at least partly with fresh gas introduced through the gas distributor plate via the lower section. The polymer powder is then transferred to the downstream reactor.

Abstract: A process for producing a polyolefin comprising a combination of liquid phase polymerization of ?-olefin conducted in one or more liquid phase polymerization reactors and gas phase polymerization of ?-olefin conducted in one or more gas phase polymerization reactors after the liquid phase polymerization in a material flow.

Abstract: A process for producing a polyolefin comprising a combination of liquid phase polymerization of ?-olefin conducted in one or more liquid phase polymerization reactors and gas phase polymerization of ?-olefin conducted in one or more gas phase polymerization reactors after the liquid phase polymerization in a material flow, the process comprising: step A of polymerizing liquid ?-olefin in the presence of a catalyst in a first reactor for liquid phase polymerization to produce a slurry comprising unreacted liquid ?-olefin and a polymer powder containing the catalyst, step B of causing gas comprising ?-olefin to flow in a second reactor for gas phase polymerization while keeping the second reactor unfilled with a seed powder, step C of transferring the slurry produced in the first reactor into the second reactor unfilled with a seed powder in which the gas comprising ?-olefin is caused to flow, step D of vaporizing the liquid ?-olefin included in the slurry transferred from the first reactor, polymerizing the va

Abstract: An apparatus and method for continuous polymerization of olefin(s), and a method for transferring a polymer powder from one reactor to another in the apparatus are disclosed. The apparatus includes a plurality of serially disposed gas-phase polymerization reactors including a combination of an upstream and downstream reactors and a gas exchange vessel disposed between both reactors. The gas exchange vessel is connected to the upstream and downstream reactors by a first and second transfer conduits, respectively. The gas exchange vessel has a gas distributor plate therein which partitions the gas exchange vessel into an upper section having a gas exchange chamber and a lower section. In the gas exchange chamber, the gas transferred from the upstream reactor together with a polymer powder is exchange at least partly with fresh gas introduced through the gas distributor plate via the lower section. The polymer powder is then transferred to the downstream reactor.