公开(公告)号：US20240209124A1

公开(公告)日：2024-06-27

申请号：US18557110

申请日：2022-04-25

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Diwaker SINGH ,  Richard B. PANNELL ,  Timothy M. BOLLER ,  Gerardo CORONA ,  Fred D. EHRMAN ,  Charles J. HARLAN ,  Yan JIANG ,  Chi-l KUO ,  William A. LAMBERTI ,  Sateesh K. RAJPUT ,  Shayan KARIMIPOUR

IPC: C08F2/34

CPC classification number: C08F2/34 ,  C08F2410/02 ,  C08F2410/05 ,  C08F2410/08

Abstract: Processes for transitioning from a first catalyst to a second catalyst in a gas phase polymerization reactor. In some embodiments, the processes relate to transitioning from a metallocene catalyst to a Ziegler-Natta catalyst. In other embodiments, the processes relate to transitioning from a first Ziegler-Natta catalyst to a second Ziegler-Natta catalyst.

公开(公告)号：US20230173447A1

公开(公告)日：2023-06-08

申请号：US18161536

申请日：2023-01-30

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Shayan KARIMIPOUR ,  Ryan W. IMPELMAN ,  Sebastian CHIALVO ,  Gerardo CORONA

IPC: B01J8/18 ,  B01J8/24

CPC classification number: B01J8/1809 ,  B01J8/1827 ,  B01J8/24 ,  B01J8/1872 ,  B01J2208/00539 ,  B01J2208/00584 ,  B01J2208/00548 ,  B01J2208/00725 ,  B01J2208/00672 ,  B01J2208/00575

Abstract: Systems and methods useful in determining the superficial gas velocity in fluidized bed reactors may utilize a pressure drop across a portion of the system but not associated with a flowmeter. For example, method may comprise: obtaining a pressure for each of two different locations within a fluidized bed reactor system that comprises a reactor capable of containing a fluidized bed and a cycle gas loop, wherein one or both of the two different locations is not at a flowmeter; calculating a pressure drop based on the two pressures; calculating a first superficial gas velocity (SGValt) for the fluidized bed based on the pressure drop; and operating the fluidized bed reactor system based at least in part on the SGValt.