US4921919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for minimizing polymer agglomerate or lump formation in a gas-phase polypropylene polymerization reactor
Assignee: BP Corp North America Inc
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Filing: 1988-06-03
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Granted: 1990-05-01
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Expires: 2008-06-03
Abstract
Abstract The process and the system are used for carrying out the quench-cooled, vapor-phase polymerization of olefin monomer in a horizontally disposed reactor vessel which comprises contacting olefin monomer, or a mixture of olefin monomers, with a polymerization catalyst system in the presence of hydrogen in the reactor vessel to form a polymer product. The improvement comprises introducing a titanium-containing catalyst component of the catalyst system into the top side of the reactor vessel at a point adjacent to the upstream end of the reactor vessel and introducing a cocatalyst plus modifer component of the catalyst system into the top side of the reactor vessel at a distance, downstream of the point of introduction of the titanium-containing catalyst component, which is equal to 25% of the inside diameter of the reactor vessel.
Inventors
- 👤 Chi-Hung Lin
- 👤 Jack F. Stevens
- 👤 Benjamin S. Tovrog
- 👤 Philip M. Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:47
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/0006; B01J19/002; B01J8/00; B01J8/18; B01J8/24; B01J8/36; B01J8/38; B01J8/382; C; C08; C08F; C08F10/00; B01J2208/00; B01J2219/00; B01J2219/00049; B01J2219/00184; B01J2219/18; B01J2219/182; B01J2219/19; B01J2219/194; B01J2219/1941; B01J2219/1943; C08F2400/00; C08F2400/02; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/919
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
In a process for quench-cooled, vapor-phase polymerization of olefin monomer in a horizontally disposed reactor vessel comprising contacting olefin monomer, or a mixture of olefin monomers, with a polymerization catalyst system in the presence of hydrogen in a reactor vessel to form a polymer product, the improvement comprising introducing a high activity titanium-containing catalyst component of the catalyst system into the top side of the reactor vessel onto a polymer bed at a point as close as possible to the upstream end of the reactor vessel, mixing the catalyst component with the polymer product in the reactor vessel and introducing a cocatalyst plus modifier component of the catalyst system into the top side of the reactor vessel onto the polymer bed at a distance downstream of the point of introduction of the catalyst, the downstream distance being equal to at least 25% of the inside diameter of the reactor vessel.
Claim 2
Dependent Claim
150 words
In a process for quench-cooled, vapor-phase polymerization of olefin monomer in a horizontally disposed reactor vessel comprising contacting olefin monomer, or a mixture of olefin monomers, with a polymerization catalyst system in the presence of hydrogen in a reactor vessel to form a polymer product, the improvement comprising introducing a high activity titanium-containing catalyst component of the catalyst system into the top side of the reactor vessel onto a polymer bed at a point as close as possible to the upstream end of the reactor vessel, mixing the catalyst component with the polymer product in the reactor vessel and introducing a cocatalyst plus modifier component of the catalyst system into the top side of the reactor vessel onto the polymer bed at a distance downstream of the point of introduction of the catalyst, the downstream distance being equal to at least 25% of the inside diameter of the reactor vessel.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the downstream distance is equal to 30% of the inside diameter of the reactor vessel.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the downstream distance is equal to 80% of the inside diameter of the reactor vessel.
References Cited (Backward Citations)
US2993036A
Cited
US3652527A
Cited
US3957448A
Cited
US4130699A
Cited
US4665143A
Cited
US4535134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |