US3817962A
Expired / Lapsed
US
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Controlled polymerization process and apparatus
Assignee: Phillips Petroleum Co
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Filing: 1971-10-26
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Granted: 1974-06-18
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Expires: 1991-10-26
Abstract
Abstract In a polymerization system having first and second feed streams, diluent and recycled diluent streams, and a modifier stream controllably fed to a reactor, a resultant product stream is passed from the reactor, and a gas stream is removed from the resultant bottoms product of the reactor. The gas stream is analyzed and signals are delivered in response to the analysis. The signals are modified and compared to a modified signal responsive to one of the flow rates of the recycled diluent stream of the second feed stream that has been modified by the flow rate of the diluent stream for providing a resultant control signal for relatively controlling the flow of the modifier stream.
Inventors
- 👤 D Smith
- 👤 W Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:08
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/24; B01J19/2415; B01J19/2435; B01J19/0006; C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
A method, as set forth in claim 1, wherein signal M is obtained by measuring the flow rate of the recycle diluent stream and delivering a signal K in response to said measurement; measuring the flow rate of the diluent stream and delivering a signal L responsive to said flow rate; adding signals K and L and delivering a signal M in response to said addition.
Claim 2
Dependent Claim
25 words
A method as set forth in claim 1, including analyzing the gas stream by passing said gas stream through a plurality of chromatographic analyzing columns.
Claim 3
Dependent Claim
26 words
A method, as set forth in claim 1, wherein the first feed stream is ethylene and the second feed stream is one of hexene-1 or butene-1.
Claim 4
Dependent Claim
161 words
A method, as set forth in claim 1, wherein said analyzing of gas stream is by chromatographically analyzing said gas stream, the first feed stream is ethylene, the second feed stream is one of hexene-1 or butene-1, the modifier stream is hydrogen, and the reactor is a polyolefin particle form type reactor, and including: receiving signals A, B, and C, subtracting said signals from a set point having a value of 1, and delivering a signal D in response to said computation; receiving signal D, dividing a set point having a value of 1 by said signal D and delivering a signal E in response to said division; measuring the flow rate of the recycled diluent stream and delivering a signal K in response to said measurement; measuring the flow rate of the diluent stream and delivering a signal L responsive to said flow rate; and, adding signals K and L and delivering a signal M in response to said addition.
Claim 5
Dependent Claim
141 words
In a method for controlling a modifier stream of polymerization process wherein first and second monomer feed streams, a diluent stream, a recycled diluent stream, and the modifier stream are controllably passed into a temperature controlled reactor, a catalyst is controllably added to the diluent stream, a resultant product stream is removed from the reactor, and passed into a flash tank for the separation of a gas stream therefrom, the improvement comprising: determining the ratio of modifier to total diluent in a gas stream separated from the product stream removed from the reactor, and, passing an amount of modifier stream into the reactor equal to the product of said ratio and the summation of the amount of said diluent stream and the amount of one of a stream chosen from among said recycled diluent stream and said second monomer feed stream.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |