公开(公告)号：US20240043581A1

公开(公告)日：2024-02-08

申请号：US18264515

申请日：2022-02-25

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Nathaniel B. GUY ,  Stacy N. OLALEYE ,  Michael D. LUCAS ,  Handel D. BENNETT ,  David T. LAKIN ,  Benjamin J. OHRAN ,  Aaron C. MCGINNIS

IPC: C08F10/02 ,  B01J8/18 ,  B01J8/00

CPC classification number: C08F10/02 ,  B01J8/1827 ,  B01J8/1872 ,  B01J8/007 ,  B01J8/1809 ,  C08F2400/02 ,  B01J2208/00761 ,  B01J2208/00769 ,  B01J2219/00164 ,  B01J2219/00162

Abstract: A process for producing an olefin polymer employs a gas phase polymerization reactor in fluid communication with a vent column and a product discharge system. The discharge system can include first and second pairs of lock hoppers, where each pair includes an upstream lock hopper connected by a valve to the reactor and a downstream lock hopper connected by a valve to the upstream lock hopper and by a further valve to a product recovery system, and where a first cross-tie can be provided between the upstream lock hoppers of the first and second pairs of lock hoppers and a second cross-tie can be provided between the downstream lock hoppers of the first and second pairs of lock hoppers. Upon reaching the vent column's maximum removal capacity, additional gas can be removed from the reactor by reducing the frequency of opening the second cross-tie between the downstream lock hoppers.