公开(公告)号：US20240409673A1

公开(公告)日：2024-12-12

申请号：US18699374

申请日：2022-10-13

Applicant: Borealis AG

Inventor： Kumudini Jayaratne ,  Hanna- Leena Rönkkö ,  Pavel Shutov ,  Joana Elvira Kettner ,  Jukka-Pekka Parjanen ,  Emilia Tiitinen

IPC: C08F10/06

Abstract: A process for forming a Ziegler-Natta catalyst component, wherein a certain combination of washing steps is employed, enabling the provision of inventive catalysts capable of synthesising polypropylenes with increased melting temperature, decreased XCS content, as well as more efficiently maintaining catalyst activity across sequential polymerization processes.

公开(公告)号：US12146019B2

公开(公告)日：2024-11-19

申请号：US17413765

申请日：2019-11-28

Applicant: BOREALIS AG

Inventor： Pasi Matikainen ,  Emilia Helisevä ,  Jukka-Pekka Parjanen

IPC: B01D21/26 ,  B01J8/00 ,  C08F4/643 ,  C08F10/00

Abstract: A process for washing a particulate substance comprising: (i) combining a particulate substance and a first washing medium in a first vessel to form a slurry and washing the particulate substance with said washing medium; (ii) transferring the slurry to a hydrocyclone; (iii) removing a first by-product stream depleted in particulate substance and a first product stream enriched in particulate substance from the hydrocyclone; (iv) transferring the first product stream to a second vessel and in the presence of a second washing medium forming a slurry and washing the particulate substance with said second washing medium e.g. by agitation thereof; (v) transferring the slurry to a hydrocyclone; (vi) removing a second by-product stream depleted in particulate substance and a second product stream enriched in particulate substance from the hydrocyclone.

公开(公告)号：US10946357B2

公开(公告)日：2021-03-16

申请号：US16098346

申请日：2017-04-28

Applicant: BOREALIS AG

Inventor： Pauli Leskinen ,  Erno Elovainio ,  Katri Nikkilä ,  Jukka-Pekka Parjanen ,  Jani Aho

IPC: C08F10/02 ,  C08F210/16 ,  B01J8/00 ,  B01J8/22 ,  C08F2/01 ,  C08F10/00

Abstract: The present invention is directed to a process for feeding a polymerisation catalyst into a polymerisation reactor (7), comprising the steps of: (i) maintaining a catalyst slurry comprising a diluent and a solid catalyst component in a catalyst feed vessel (4); (ii) continuously withdrawing a stream of the catalyst slurry from the catalyst feed vessel (4); and (iii) introducing the withdrawn portion of the catalyst slurry into the polymerisation reactor (7), wherein the catalyst slurry is transferred by using a valveless piston pump (5) from the catalyst feed vessel (4) into the polymerisation reactor (7); the diluent has a dynamic viscosity of from 0.01 to 20 mPas at the conditions within the catalyst feed vessel (4), and wherein the catalyst slurry is transferred along a substantially vertical path downwards from the catalyst feed vessel (4) to the reactor (7).