Process for transitioning between incompatible catalysts
First Claim
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1. A process for transitioning from a first continuous polymerization reaction in a gas phase reactor conducted in the presence of a first catalyst to a second polymerization reaction conducted in the presence of a second catalyst in the gas phase reactor wherein the first and second catalysts are incompatible, the process comprising:
- (a) discontinuing the introduction of the first catalyst from a first catalyst feeding system into the gas phase reactor;
(b) introducing a catalyst killer to at least partially deactivate the first catalyst in the gas phase reactor; and
(c) introducing into the gas phase reactor the second catalyst from a second catalyst feeding system separate from the first catalyst feeding system.
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Abstract
The invention relates to a process for transitioning from a first continuous polymerization reaction in a gas phase reactor conducted in the presence of a first catalyst to a second polymerization reaction conducted in the presence of a second catalyst in the gas phase reactor wherein the first and second catalysts are incompatible, the process comprising: (a) discontinuing the introduction of the first catalyst from a first catalyst feeding system into a reactor; (b) introducing a catalyst killer to at least partially de-activate the first catalyst in the reactor (c) introducing into the reactor a second catalyst from a second catalyst feeding system separate from the first catalyst feeding system.
68 Citations
20 Claims
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1. A process for transitioning from a first continuous polymerization reaction in a gas phase reactor conducted in the presence of a first catalyst to a second polymerization reaction conducted in the presence of a second catalyst in the gas phase reactor wherein the first and second catalysts are incompatible, the process comprising:
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(a) discontinuing the introduction of the first catalyst from a first catalyst feeding system into the gas phase reactor; (b) introducing a catalyst killer to at least partially deactivate the first catalyst in the gas phase reactor; and (c) introducing into the gas phase reactor the second catalyst from a second catalyst feeding system separate from the first catalyst feeding system. - View Dependent Claims (2, 3)
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4. A process for transitioning from a first continuous polymerization reaction in a gas phase reactor conducted in the presence of a first catalyst to a second polymerization reaction conducted in the presence of a second catalyst in the gas phase reactor wherein the first and second catalysts are incompatible, the process comprising:
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(a) discontinuing the introduction of the first catalyst from a first catalyst feeding system into the gas phase reactor; (b) introducing a catalyst killer to at least partially deactivate the first catalyst in the gas phase reactor; and (c) introducing into the gas phase reactor the second catalyst from a second catalyst feeding system separate from the first catalyst feeding system, wherein the second catalyst is a metallocene catalyst composition comprising a support containing a metallocene catalyst, a catalyst activator and an optional modifier, and wherein the metallocene catalyst is selected from the group consisting of;
[ortho-bis(4-phenyl-2-indenyl)-benzene]zirconiumdichloride, [ortho-bis(5-phenyl-2-indenyl)-benzene]zirconiumdichloride, [ortho-bis(2-indenyl)benzene]zirconiumdichloride, [ortho-bis(2-indenyl)benzene]hafniumdichloride, [ortho-bis(1-methyl-2-indenyl)-benzene]zirconiumdichloride, [2.2′
-(1.2-phenyldiyl)-1.1′
-dimethylsilyl-bis(indene)]zirconiumdichloride, [2,2′
-(1,2-phenyldiyl)-1, 1′
-diphenylsilyl-bis(indene)]zirconiumdichloride, [2,2′
-(1.2-phenyldiyl)-1.1′
-(1.2-ethanediyl)-bis(indene)]zirconiumdichloride, [2.2′
-bis(2-indenyl)biphenyl]zirconiumdichloride and [2,2′
-bis(2-indenyl)biphenyl]hafniumdichloride. - View Dependent Claims (5, 12, 13, 15, 16)
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6. A process for transitioning from a first continuous polymerization reaction in a gas phase reactor conducted in the presence of a first catalyst to a second polymerization reaction conducted in the presence of a second catalyst in the gas phase reactor wherein the first and second catalysts are incompatible, the process comprising:
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(a) discontinuing the introduction of the first catalyst from a first catalyst feeding system into the gas phase reactor; (b) introducing a catalyst killer to at least partially deactivate the first catalyst in the gas phase reactor; (b2) introducing an organometallic compound into the reactor to react with the catalyst killer; (b3) introducing a gas composition into the reactor for the second polymerization reaction; (b4) introducing a reaction product of an aluminum compound of general formula (1) - View Dependent Claims (7, 8, 9, 10, 11, 14, 17, 18, 19, 20)
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Specification
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Current AssigneeSABIC Global Technologies BV (Government of Saudi Arabia)
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Original AssigneeSABIC Global Technologies BV (Government of Saudi Arabia)
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InventorsBanat, Yahya, Al-Humydi, Abdulaziz Hamad, Fellahi, Said
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Primary Examiner(s)Cheung, William K
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Application NumberUS15/538,013Publication NumberTime in Patent Office1,442 DaysField of Search526 66US Class CurrentCPC Class CodesC08F 10/00 Homopolymers and copolymers...C08F 10/02 EtheneC08F 2/34 Polymerisation in gaseous s...C08F 2/42 using short-stopping agentsC08F 210/14 Monomers containing five or...C08F 210/16 Copolymers of ethene with a...C08F 2500/12 Melt flow index or melt flo...C08F 2500/24 Polymer with special partic...
