US4255542A
Expired / Lapsed
US
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Exothermic polymerization in a vertical fluid bed reactor system containing cooling means therein and apparatus therefor
Assignee: Union Carbide Corp
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Filing: 1978-11-30
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Granted: 1981-03-10
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Expires: 1998-11-30
Abstract
Abstract A continuous low pressure gas phase process for the production of solid particulate polymers during an exothermic polymerization reaction in a uniform diameter vertical fluidized bed reactor system which comprises feeding a polymerization catalyst and a gaseous stream containing at least one polymerizable monomer to a fluidized bed of polymer particles and removing the exothermic heat of reaction by indirect cooling means in the reactor and removing dry particulate polymer. Also, apparatus for the polymerization process is described.
Inventors
- 👤 Gary L. Brown
- 👤 David F. Warner
- 👤 Jae H. Byon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:07
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/1836; C; C08; C08F; C08F10/00; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00141; Y; Y10; Y10S; Y10S526/00; Y10S526/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A continuous low pressure gas phase process for the production of solid particulate polymers during an exothermic polymerization reaction in a fluid bed reaction system comprising a vertical fluidized bed reactor which is of uniform diameter through its entire height, said reaction system being devoid of particle entrainment means, which comprises feeding a polymerization catalyst and a gaseous stream containing at least one polymerizable monomer to a fluidized bed of polymer particles in said reactor at a pressure of 50 to 1000 psi, removing the exothermic heat of reaction with, as the only cooling means employed for such purpose, indirect cooling means in said fluidized bed in said reactor and removing particulate polymer from said reactor, and wherein the mass gas flow rate through the fluidized bed is in the range of from about 1.5 to<10 G mf based on the minimum free cross-sectional area of the bed.
Claim 2
Dependent Claim
148 words
A continuous low pressure gas phase process for the production of solid particulate polymers during an exothermic polymerization reaction in a fluid bed reaction system comprising a vertical fluidized bed reactor which is of uniform diameter through its entire height, said reaction system being devoid of particle entrainment means, which comprises feeding a polymerization catalyst and a gaseous stream containing at least one polymerizable monomer to a fluidized bed of polymer particles in said reactor at a pressure of 50 to 1000 psi, removing the exothermic heat of reaction with, as the only cooling means employed for such purpose, indirect cooling means in said fluidized bed in said reactor and removing particulate polymer from said reactor, and wherein the mass gas flow rate through the fluidized bed is in the range of from about 1.5 to<10 G mf based on the minimum free cross-sectional area of the bed.
Claim 3
Dependent Claim
17 words
A process as in claim 1 wherein the temperature of the reaction is 30° to 125° C.
Claim 4
Dependent Claim
14 words
A process as in claim 2 wherein the temperature is 75° to 115° C.
Claim 5
Dependent Claim
14 words
A process as in claim 1 wherein the pressure is 50 to 350 psi.
Claim 6
Dependent Claim
18 words
A process as in claim 1 wherein the catalyst is a high activity chromium and/or titanium containing catalyst.
Claim 7
Dependent Claim
13 words
A process as in claim 1 wherein the polymer is an olefin polymer.
References Cited (Backward Citations)
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US3770714A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |