公开(公告)号：US11618793B2

公开(公告)日：2023-04-04

申请号：US17444094

申请日：2021-07-30

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Michael D. Lucas ,  Anne Bernard-Brunel ,  Ryan W. Impelman ,  Keng-Hua Beh ,  Diwaker Singh, Sr. ,  Rui Hoong Chong ,  Corrine L. Brandl ,  Luis A. Sotomayor

IPC: C08F210/02

Abstract: Gas phase polymerization processes include contacting an input stream comprising a monomer and an induced condensing agent in the presence of an inert gas with a catalyst in a fluidized bed reactor to produce a polymer, unreacted monomer, and an output gas; recycling a recycle stream of the unreacted monomer from the reactor to the input stream; venting at least a portion of the output gas from the reactor; and maintaining a partial pressure of the inert gas in the reactor above a reference inert gas pressure to decrease losses of the recycle stream with the vented output gas. The processes may include controlling the inert gas partial pressure to vary the total reactor pressure up to the maximum safe pressure, without causing carry-over of product polymer.

公开(公告)号：US20220064343A1

公开(公告)日：2022-03-03

申请号：US17444094

申请日：2021-07-30

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Michael D. Lucas ,  Anne Bernard-Brunel ,  Ryan W. Impelman ,  Keng-Hua Beh ,  Diwaker Singh ,  Rui Hoong Chong ,  Corrine L. Brandl ,  Luis A. Sotomayor

IPC: C08F210/02

Abstract: Gas phase polymerization processes include contacting an input stream comprising a monomer and an induced condensing agent in the presence of an inert gas with a catalyst in a fluidized bed reactor to produce a polymer, unreacted monomer, and an output gas; recycling a recycle stream of the unreacted monomer from the reactor to the input stream; venting at least a portion of the output gas from the reactor; and maintaining a partial pressure of the inert gas in the reactor above a reference inert gas pressure to decrease losses of the recycle stream with the vented output gas. The processes may include controlling the inert gas partial pressure to vary the total reactor pressure up to the maximum safe pressure, without causing carry-over of product polymer.