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.

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：US20230002522A1

公开(公告)日：2023-01-05

申请号：US17756935

申请日：2020-11-12

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Shayan KARIMIPOUR ,  Michael E. SIELOFF ,  Benjamin J. OHRAN

IPC: C08F110/02

Abstract: Methods for producing a polymer include contacting at least one monomer under polymerization conditions with a fluidized bed of a polymerization catalyst on a particulate support; measuring a plurality of pressures of the fluidized bed at a plurality of locations corresponding to increasing heights from a bottom of the fluidized bed; calculating a plurality of pressure drops between the plurality of locations based on the measured pressures; performing a regression analysis on the calculated plurality of pressure drops; correlating the plurality of pressure drops to corresponding heights from the bottom of the fluidized bed based on the regression analysis; determining a height of the fluidized bed based on the correlating; and controlling polymerization conditions based on the determined height of the fluidized bed. The method can also be used to detect malfunctioning pressure transducers based on deviation between measured and expected values.