公开(公告)号：US11098143B2

公开(公告)日：2021-08-24

申请号：US16649044

申请日：2018-09-13

Applicant: BASELL POLIOLEFINE ITALIA S.R.L.

Inventor： Antonio Mazzucco ,  Enrico Balestra ,  Roberto Pantaleoni ,  Davide Tartari ,  Riccardo Rinaldi

IPC: B01J8/26 ,  C08F210/06 ,  B01J8/22

Abstract: A process for the polymerization of olefins in gas phase carried out in a reactor having two interconnected polymerization zones, a first zone (riser) and a second zone (downcomer), wherein growing polymer particles: a) flow through the riser under fast fluidization conditions established by feeding a mixture of gas and liquid; b) leave the riser and enter the downcomer, through which the growing polymer particles flow downward in a densified form; and c) leave the downcomer and are reintroduced into the riser, thereby establishing a circulation of polymer between the riser and the downcomer; the reactor is operated at a temperature between 0° C. and 5° C. above the dew point of the riser gas at the operating pressure, and in the riser, besides the growing polymer particles and gas flow, an amount of liquid is present.

公开(公告)号：US11084016B2

公开(公告)日：2021-08-10

申请号：US16636774

申请日：2018-07-17

Applicant: BASELL POLIOLEFINE ITALIA S.R.L.

Inventor： Gian Luca Bonaccorsi ,  Giuseppe Penzo ,  Enrico Balestra ,  Maurizio Dorini ,  Riccardo Rinaldi

IPC: B01J19/06 ,  B01J19/24

Abstract: A manhole for a polymerization unit having a through-hole formed with a shoulder matching a corresponding shoulder of a plug of a closure member operatively inserted in the through-hole. The through-hole can be closed with a minimum clearance, such that polymer particles do not deposit in the gap between the wall of the unit and the plug of the closure member.

公开(公告)号：US10604645B2

公开(公告)日：2020-03-31

申请号：US16064900

申请日：2016-11-28

Applicant: BASELL POLIOLEFINE ITALIA S.R.L.

Inventor： Antonio Mazzucco ,  Gabriele Mei ,  Tiziana Caputo ,  Roberto Pantaleoni ,  Enrico Balestra ,  Maria Di Diego ,  Mara Destro ,  Riccardo Rinaldi

IPC: C08L23/12 ,  C08F2/00 ,  C08F2/38

Abstract: A process for the preparation of polyolefins carried out in the presence of an antistatic composition made from or containing:a) a compound of formula R—OH wherein R represents hydrogen or a linear or branched, saturated alkyl group having from 1 to 15 carbon atoms; andb) an oligomeric or polymeric organic compound having one or more terminal hydroxyl groups and a viscosity at 40° C. of at least about 20 mm2/sec (DIN 51562).