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公开(公告)号：US20180178180A1
公开(公告)日：2018-06-28
申请号：US15853072
申请日：2017-12-22
Applicant: Basell Polyolefine GmbH
Inventor： Gabriele Mei , Massimo Covezzi , Gerhardus Meier , Antonio Mazzucco , Pietro Baita , Ulf Schueller , Lorella Marturano , Enrico Balestra
IPC: B01J8/28 , C08F110/02 , C08F110/06 , B01J8/18
Abstract: A process for starting a multizone circulating reactor containing no polyolefin particles, comprising the steps of conveying gas through the reactor and the gas recycle line, feeding a particulate material comprising a polymerization catalyst and optionally polyolefin into the reactor, controlling the gas flow in a vertical reactor zone equipped with a throttling valve at the bottom so that the upwards gas velocity in the bottom part of this reaction zone is lower than the terminal free-fall velocity of the particulate material fed into the reactor, and, after the weight of the particulate polyolefin in this reactor zone is higher than the drag force of the upward moving gas, controlling the circulation rate of the polymer particles within the multizone circulating reactor by adjusting the opening of the throttling valve and adjusting the flow rate of a dosing gas.
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公开(公告)号：US20240075450A1
公开(公告)日：2024-03-07
申请号：US18256065
申请日：2021-12-07
Applicant: Basell Polyolefine GmbH
Inventor： Giuseppe Penzo , Maurizio Dorini , Riccardo Rinaldi , Enrico Balestra , Gian Luca Bonaccorsi
CPC classification number: B01J19/2435 , B01J4/001 , B01J8/1854 , B01J19/2405 , B01J2204/002 , B01J2208/00991 , B01J2219/185
Abstract: A reactor for carrying out a gas-phase olefin polymerization in the presence of a polymerization catalyst, made from or containing (i) a first polymerization zone adapted and arranged for growing polymer particles to flow upward under fast fluidization or transport conditions, (ii) a second polymerization zone adapted and arranged for the growing polymer particles to flow downward, and (iii) a set of bars for introducing feedstock or a barrier stream into the reactor, wherein each bar has (a) a hollow space along the length of the bar, (b) a particle deviating top, and (c) a multiplicity of openings arranged along the bottom half of the periphery of the bar.
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公开(公告)号：US10471407B2
公开(公告)日：2019-11-12
申请号：US15853072
申请日：2017-12-22
Applicant: Basell Polyolefine GmbH
Inventor： Gabriele Mei , Massimo Covezzi , Gerhardus Meier , Antonio Mazzucco , Pietro Baita , Ulf Schueller , Lorella Marturano , Enrico Balestra
IPC: B01J8/28 , B01J8/18 , C08F110/02 , C08F110/06
Abstract: A process for starting a multizone circulating reactor containing no polyolefin particles, comprising the steps of conveying gas through the reactor and the gas recycle line, feeding a particulate material comprising a polymerization catalyst and optionally polyolefin into the reactor, controlling the gas flow in a vertical reactor zone equipped with a throttling valve at the bottom so that the upwards gas velocity in the bottom part of this reaction zone is lower than the terminal free-fall velocity of the particulate material fed into the reactor, and, after the weight of the particulate polyolefin in this reactor zone is higher than the drag force of the upward moving gas, controlling the circulation rate of the polymer particles within the multizone circulating reactor by adjusting the opening of the throttling valve and adjusting the flow rate of a dosing gas.
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