公开(公告)号：US20200376458A1

公开(公告)日：2020-12-03

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：US20190023885A1

公开(公告)日：2019-01-24

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

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; and b) 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).

公开(公告)号：US20200216588A1

公开(公告)日：2020-07-09

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: C08F210/06 ,  B01J8/26 ,  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.