公开(公告)号：US10577435B2

公开(公告)日：2020-03-03

申请号：US15754445

申请日：2016-07-27

Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

Inventor： Orass M. Hamed ,  Nayef M. Al-Enazi ,  Vugar O. Aliyev ,  Abderrahman Meddad

IPC: C08F2/34 ,  C08F10/02 ,  C08F110/14 ,  B01J21/06 ,  B01J21/08 ,  B01J23/26 ,  B01J35/02 ,  B01J35/10 ,  B01J37/08 ,  B01J37/02 ,  B01J8/00 ,  B60K15/03 ,  B01J23/00

Abstract: The invention relates to a gas phase polymerisation process for the production of ethylene polymers in the presence of a catalyst composition based on a chromium compound, a titanium compound and a silica support material. The silica support material has a surface area (SA) between 685 m2/g and 800 m2/g, a pore volume (PV) between 1.65 and 1.85 cm3/g and an average particle size in the range between 25 and 35 micrometres. The catalyst composition is injected by a dry catalyst feeder into the polymerization reactor.

公开(公告)号：US20180194868A1

公开(公告)日：2018-07-12

申请号：US15754445

申请日：2016-07-27

Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

Inventor： Orass M. Hamed ,  Nayef M. Al-Enazi ,  Vugar O. Aliyev ,  Abderrahman Meddad

IPC: C08F2/34 ,  C08F10/02 ,  C08F110/14 ,  B01J21/06 ,  B01J21/08 ,  B01J23/26 ,  B01J35/02 ,  B01J35/10

CPC classification number: C08F2/34 ,  B01J8/0015 ,  B01J21/063 ,  B01J21/08 ,  B01J23/002 ,  B01J23/26 ,  B01J35/023 ,  B01J35/1023 ,  B01J35/1047 ,  B01J37/0203 ,  B01J37/0205 ,  B01J37/088 ,  B01J2523/00 ,  B60K15/03 ,  C08F10/02 ,  C08F110/14 ,  C08F2500/07 ,  C08F210/16 ,  C08F4/69 ,  C08F4/6372 ,  C08F4/025 ,  C08F210/14 ,  C08F2500/12 ,  C08F2500/18 ,  C08F2500/04 ,  B01J2523/47 ,  B01J2523/67

Abstract: The invention relates to a gas phase polymerisation process for the production of ethylene polymers in the presence of a catalyst composition based on a chromium compound, a titanium compound and a silica support material. The silica support material has a surface area (SA) between 685 m2/g and 800 m2/g, a pore volume (PV) between 1.65 and 1.85 cm3/g and an average particle size in the range between 25 and 35 micrometres. The catalyst composition is injected by a dry catalyst feeder into the polymerization reactor.

公开(公告)号：US09914794B2

公开(公告)日：2018-03-13

申请号：US15313758

申请日：2015-05-26

Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

Inventor： Nayef M. Al-Enazi

IPC: C08F210/16

CPC classification number: C08F210/16 ,  C08F2410/05 ,  C08F4/6565 ,  C08F4/6546 ,  C08F2/34 ,  C08F210/08 ,  C08F2500/07 ,  C08F2500/12 ,  C08F4/69 ,  C08F2500/08 ,  C08F4/025

Abstract: The invention relates to a process for transitioning from a first continuous polymerization reaction of ethylene and a first comonomer for producing a linear low density polyethylene conducted in the presence of a Ziegler-Natta catalyst in a gas phase reactor to a second continuous polymerization reaction of ethylene and a second comonomer for producing a high density polyethylene conducted in the presence of a chromium-based catalyst in the gas phase reactor, the process comprising: (i) reducing the feed of the first comonomer into the reactor until the ratio of the first comonomer to ethylene in the reactor is at most 0.1; (ii) discontinuing the introduction of the Ziegler-Natta catalyst while the introduction of a co-catalyst of the Ziegler-Natta catalyst is continued and subsequently discontinuing the introduction of the co-catalyst; (iii) maintaining the polymerization conditions in the reactor and permitting polymerization to continue for a time in order to allow the components of the Ziegler-Natta catalyst present in the reactor to consume themselves in the production of additional polymer; (iv) discontinuing the introduction of all feeds into the reactor; (v) depressurizing the reactor; (vi) flow-purging the reactor; (vii) reducing the reactor temperature; (viii) introducing ethylene and H2 into the reactor to obtain a partial pressure of ethylene and a volume ratio of H2 to ethylene for the second polymerization reaction, wherein the partial pressure of ethylene is increased to the pressure for the second polymerization reaction at such a speed that the reactor temperature is maintained at a temperature lower than the temperature of the first polymerization conditions; (ix) increasing the reactor temperature to a temperature of the second polymerization conditions; (x) introducing the second catalyst into the reactor and (xi) introducing the second comonomer into the reactor to obtain a reactor composition for the second polymerization reaction.