| 摘要 |
Method for preparing olefin polymer in a loop reactor, said loop reactor comprises a first outlet for withdrawing polymer slurry from the loop reactor, and a second outlet for withdrawing a polymer slurry from the loop reactor, wherein the first outlet is located such that polymer slurry is withdrawn having a concentration of polymer which is equal or higher than the average concentration of polymer in the loop reactor, and the second outlet is located such that polymer slurry is withdrawn having a concentration of polymer which is lower than the average concentration of polymer in the loop reactor, the method comprises the steps of supplying olefin monomers and a catalytic system to the loop reactor to form a polymer slurry in the loop reactor, and controlling the total amount of polymer and/or the total amount of polymer slurry withdrawn from the loop reactor by adjusting the ratio of polymer slurry withdrawn through the first outlet and polymer slurry withdrawn through the second outlet. |
| 主权项 |
1. A method for preparing olefin polymer in at least one loop reactor, said loop reactor comprises:
(a) at least one lower horizontal segment and/or at least one lower bend, (b) at least one upper horizontal segment and/or at least one upper bend, and (c) at least two vertical segments, connected in operable communication, said loop reactor further comprises (d) a first outlet for withdrawing a first polymer slurry from the loop reactor, said first polymer slurry comprises olefin polymer and fluid phase; said first outlet is located such that the first polymer slurry withdrawn has a concentration of polymer which is the same as or higher than the average concentration of polymer in the loop reactor, and (e) a second outlet for withdrawing a second polymer slurry from the loop reactor, said second polymer slurry comprises olefin polymer and fluid phase; said second outlet is located such that the second polymer slurry withdrawn has a concentration of polymer which is lower than the average concentration of polymer in the loop reactor, the method comprises the steps of (i) supplying olefin monomers, a catalytic system, and optionally olefin comonomers to the loop reactor to form a polymer slurry in the loop reactor, and (ii) controlling (ii1) the total amount of polymer withdrawn from the loop reactor, and/or (ii2) the total amount of polymer slurry withdrawn from the loop reactor, and/or (ii3) the concentration of polymer within the total polymer slurry withdrawn from the loop reactor by adjusting the ratio of the first polymer slurry withdrawn through the first outlet and the second polymer slurry withdrawn through the second outlet. |
