US5948871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for feeding a liquid catalyst to a fluidized bed polymerization reactor
Assignee: Univation Technologies LLC
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Filing: 1997-05-29
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Granted: 1999-09-07
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Expires: 2017-05-29
Abstract
Abstract For gas phase polymerization reactions in the presence of an unsupported polymerization catalyst, there is provided a process for introducing a liquid catalyst so as to provide a resin particle lean zone such that the average particle size of the resin produced ranges from about 0.01 to about 0.06 inches.
Inventors
- 👤 Mark Gregory Goode
- 👤 Clark Curtis Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:48
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1818; B01J8/1827; B01J19/00; B01J19/26; B01J8/0015; B01J8/004; C; C08; C08F; C08F10/00; C08F10/02; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00539; B01J2208/00743; B01J2208/00752; C08F210/00; C08F210/16; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/6592; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/943
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
37 words
A process for making a polymer resin comprising: introducing a monomer into the polymerization zone of a gas phase reactor; and introducing a liquid polymerization catalyst to a resin particle lean zone within the gas phase reactor.
Claim 2
Dependent Claim
37 words
A process for making a polymer resin comprising: introducing a monomer into the polymerization zone of a gas phase reactor; and introducing a liquid polymerization catalyst to a resin particle lean zone within the gas phase reactor.
Claim 3
Dependent Claim
14 words
A process according to claim 1 wherein the catalyst is a Ziegler-Natta in slurry.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein the catalyst is in solution or suspension.
Claim 5
Dependent Claim
12 words
A process according to claim 3 wherein the catalyst is a metallocene.
Claim 6
Dependent Claim
19 words
A process according to claim 4 wherein the catalyst is introduced to the reactor with an inert carrier gas.
Claim 7
Dependent Claim
33 words
A process according to claim 5 wherein the particle lean zone is created by deflecting the resin with a stream of gas away from the catalyst as it is introduced into the reactor.
Claim 8
Dependent Claim
36 words
A process according to claim 6 wherein the catalyst is introduced to the reactor with a nozzle tube having a particle-deflecting gas tube enclosing a tip-cleaning gas tube which in turn encloses a catalyst injection tube.
Claim 9
Dependent Claim
13 words
A process according to claim 6 wherein the nozzle is a spray nozzle.
Claim 10
Dependent Claim
14 words
A process according to claim 1 wherein propylene homopolymer or copolymer is the polymer.
Claim 11
Dependent Claim
15 words
A process according to claim 1 wherein the process is carried out in multiple reactors.
Claim 12
Dependent Claim
13 words
A process according to claim 10 wherein the polymer is a propylene copolymer.
Claim 13
Dependent Claim
10 words
A process according to claim 1 operating in condensed mode.
Claim 14
Dependent Claim
17 words
A process according to claim 12 wherein the reactor has a fluidized bed of growing polymer particles.
Claim 15
Dependent Claim
33 words
A process according to claim 13 wherein the particle lean zone is created by deflecting the resin with a stream of gas away from the catalyst as it is introduced into the reactor.
Claim 16
Dependent Claim
18 words
A process according to claim 14 wherein the catalyst is introduced into the reactor with a spray nozzle.
Claim 17
Dependent Claim
27 words
A process according to claim 15 wherein the spray nozzle is a tube enclosed within another tube through which the particle-deflecting gas is fed to the reactor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-09-06 | 2003-03-08 | 2003-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-06 | 2007-03-08 | 2007-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-09-06 | 2011-03-08 | 2011-09-07 | $7700.00 | Window Closed / Lapsed |