| 摘要 |
Continuous gas phase polymerization of fluid monomer components for the production of polyolefins in a fluidized bed reactor is characterized in that the fluidizing gas is withdrawn from the reactor by means of a direct cooling device by which the cooling agent is brought into direct contact with the fluidizing gas by which the cooling agent is brought into direct contact with the fluidizing gas. A continuous gas phase polymerization process for the production of polyolefins, preferably polyethylene by polymerization of fluid monomer components, preferably ethylene and optionally at least one comonomer in the polymerization zone of a fluidized bed reactor in the presence of at least one catalyst under reaction conditions, whereby the fluidizing gas for withdrawal of the heat of polymerization and/or reaction is fed in a recycle loop and the polymerization product is removed from the loop with replenishment of the corresponding quantity of monomers and optionally comonomers and additives, is characterized in that the fluidizing gas is withdrawn from the reactor by means of a direct cooling device by which the cooling agent is brought into direct contact with the fluidizing gas and cooled whereby the heated cooling agent is cooled in at least one further cooling stage and is at least partially fed back to the direct cooling device and/or heated or cooled cooling agent is at least partially fed back to the fluidized bed reactor. An Independent claim is included for a gas phase polymerization system for the production of polyolefins comprising (i) at least one fluidized bed reactor, preferably having one or more inlets and optionally nozzles for the introduction of a cooling agent for the purpose of direct contact with the fluidizing gas (ii) at least one cooling device having at least one inlet for the introduction of cooling agent for the purpose of direct contact with fluidizing gas (iii) optionally a droplet separator, preferably situated after the cooling stage (iv) optionally a purifying device, preferably integrated in the cooling device or is connected to it, to purify the fluidizing gas and/or fluidizing gas condensate and/or cooling agent and (v) optionally other fluidizing layer reactors situated before and/or after the polymerization reactors. |
