公开(公告)号：US11492422B2

公开(公告)日：2022-11-08

申请号：US16952991

申请日：2020-11-19

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Michael D. Lucas ,  Handel D. Bennett ,  David T. Lakin ,  Aaron C. McGinnis ,  Benjamin J. Ohran ,  David J. Sandell

IPC: C08F2/34 ,  C08F2/01 ,  C08F210/16 ,  C08F210/06 ,  C08F210/02

Abstract: A process for producing an olefin polymer employs a gas phase polymerization reactor having a product discharge system comprising first and second pairs of lock hoppers, wherein each pair comprises an upstream lock hopper connected by valve means to the reactor and a downstream lock hopper connected by valve means to the upstream lock hopper and by further valve means to a product recovery system, and wherein a first cross-tie is provided between the upstream lock hoppers of the first and second pairs of lock hoppers and a second cross-tie is provided between the downstream lock hoppers of the first and second pairs of lock hoppers. Operation of the second cross-tie during product removal cycles is controlled in accordance with reactor pressure.

公开(公告)号：US20210079126A1

公开(公告)日：2021-03-18

申请号：US16952991

申请日：2020-11-19

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Michael D. Lucas ,  Handel D. Bennett ,  David T. Lakin ,  Aaron C. McGinnis ,  Benjamin J. Ohran ,  David J. Sandell

IPC: C08F2/34 ,  C08F2/01 ,  C08F210/02 ,  C08F210/06 ,  C08F210/16

Abstract: A process for producing an olefin polymer employs a gas phase polymerization reactor having a product discharge system comprising first and second pairs of lock hoppers, wherein each pair comprises an upstream lock hopper connected by valve means to the reactor and a downstream lock hopper connected by valve means to the upstream lock hopper and by further valve means to a product recovery system, and wherein a first cross-tie is provided between the upstream lock hoppers of the first and second pairs of lock hoppers and a second cross-tie is provided between the downstream lock hoppers of the first and second pairs of lock hoppers. Operation of the second cross-tie during product removal cycles is controlled in accordance with reactor pressure.