公开(公告)号：US08183332B2

公开(公告)日：2012-05-22

申请号：US12733358

申请日：2008-08-29

Applicant: Benoit Koch ,  Daniel Marissal ,  Marc Parisel ,  Brent R Walworth

Inventor： Benoit Koch ,  Daniel Marissal ,  Marc Parisel ,  Brent R Walworth

IPC: C08F2/00 ,  C08F4/44 ,  C08F4/72 ,  B01J19/00 ,  B01J19/18 ,  F01N3/20

CPC classification number: B01J19/2435 ,  B01J2219/0004 ,  B01J2219/00166 ,  B01J2219/00186 ,  C08F10/02 ,  C08F110/02 ,  C08F2/14 ,  C08F2/001 ,  C08F2500/01 ,  C08F2500/12 ,  C08F2500/02

Abstract: Process for producing a multimodal polyethylene in at least two reactors connected in series, in which 20-80 wt % of a high molecular weight (HMW) polymer is made in suspension in a first reactor and 20-80 wt % of a low molecular weight (LMW) polymer is made in suspension in a second reactor. The ratio of the average activity in the LMW reactor to the average activity in the HMW reactor is from 0.25 and 1.5, where average activity in each reactor is defined as the rate of polyethylene produced in the reactor (kgPE/hr)/[ethylene concentration in the reactor (mol %)×residence time in the reactor (hours)×feed rate of catalyst into the reactor (g/hr)], residence time being defined as the mass of the polymer in the reactor (kg)/the output rate of polymer from the reactor (kg/hr). The volume of the second reactor is at least 10% greater than the volume of the first reactor, and the ratio of length to diameter of the first reactor, L/D(1), is greater than that of the second reactor, L/D(2).

Abstract translation: 在至少两个串联连接的反应器中制备多峰聚乙烯的方法，其中20-80重量％的高分子量（HMW）聚合物悬浮在第一反应器中，20-80重量％的低分子量 （LMW）聚合物悬浮在第二反应器中。 LMW反应器中的平均活性与平均活性的比例为0.25和1.5，其中每个反应器中的平均活性定义为在反应器中产生的聚乙烯的速率（kgPE / hr）/ [乙烯浓度 在反应器中（mol％）×在反应器中的停留时间（小时）×催化剂进入反应器的进料速率（g / hr）]，停留时间定义为反应器中聚合物的质量（kg）/输出 来自反应器的聚合物的速率（kg / hr）。 第二反应器的体积比第一反应器的体积大至少10％，第一反应器的长度与直径之比L / D（1）大于第二反应器的L / D（2）。