Patent ID: 8455595

Claim:
A method for the slurry polymerization of olefins comprising: providing a first loop reactor operated at a first pressure; providing a second loop reactor operated at a second pressure controlled in real time by variations in the first pressure to maintain a predetermined pressure difference of from 0.5 bars to 2 bars, wherein the first loop reactor and the second loop reactor are connected in series via a line adapted for transferring growing polymer from the first loop to the second loop, wherein the line connecting two loops is subject to a dynamic pressure difference; introducing olefin monomer into the first loop reactor; contacting the olefin monomer with a first catalyst system within the first loop reactor to form a first polyolefin; withdrawing the first polyolefin from the first loop reactor; transferring the first polyolefin from the first loop reactor to the second loop reactor via the line; contacting the first polyolefin with a second catalyst system within the second loop reactor to form a second polyolefin; and withdrawing the second polyolefin from the second loop reactor.