| 摘要 |
Olefin polymers are produced by continuously withdrawing from a loop reactor (1) a polymer slurry containing polymer and a fluid phase, optionally concentrating the slurry, conducting the concentrated slurry to a high pressure flash unit, and feeding product flow (32) to a gas phase reactor (4). Production of olefin polymers in the presence of a catalytic system in a continuously operated multistage polymerization sequence, where an olefin monomer is polymerized first in slurry phase in a hydrocarbon diluent or liquid monomer, in a loop reactor(s), the slurry having a first concentration of solids, and subsequently in gas phase in a gas phase reactor(s), comprises continuously withdrawing from the loop reactor a polymer slurry containing polymer and a fluid phase, further containing hydrocarbons and optionally hydrogen; optionally concentrating the slurry by removing a part of the fluid phase to provide a concentrated slurry; conducting the concentrated slurry having a second concentration of solids, which is higher than the first concentration of solids, to a high pressure flash unit to remove all of the remaining fluid phase and to provide a product flow containing a suspension of polymer solids and gases; and feeding the product flow of the flash unit to the gas phase reactor. An independent claim is also included for an apparatus for producing an olefin polymer in the presence of a catalytic system, comprising in a cascade a loop reactor, a hydrocyclone (2), and a high-pressure flash and a gas phase reactor. |
