Patent EP0004417A2 successfully refreshed from Google Patents.
EP0004417A2
Expired / Lapsed
EP
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Gas-phase olefin polymerisation system and process for operating it
Assignee: BASF SE
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Filing: 1979-02-26
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Granted: —
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Expires: 1999-02-26
Abstract
Abstract A gas-phase olefin polymerisation system is provided with means for sensing a potentially dangerous condition such as a rapidly increasing temperature and/or pressure, and means for introducing carbon dioxide into the system to at least reduce the rate of polymerisation. The system may be a stirred-bed system provided with means for automatically introducing carbon dioxide into the system in response to failure of the stirrer motor.
Inventors
- 👤 Philip Charsley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 23:36
CPC Classifications
C; C08; C08F; C08F10/00; B; B01; B01J; B01J19/00; B01J19/0006; B01J19/002; B01J8/00; B01J8/001; B01J8/08; B01J8/10; B01J2219/00; B01J2219/00049; B01J2219/00245; B01J2219/00272
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
44 words
A gas-phase olefin polymerisation system including a gas-phase polymerisation reactor, means to detect, within the polymerisation reactor, an undesirable, or a potentially undesirable, reaction condition, a source of gaseous carbon dioxide and connecting means from said source of carbon dioxide to the polymerisation reactor.
Claim 2
Dependent Claim
44 words
A gas-phase olefin polymerisation system including a gas-phase polymerisation reactor, means to detect, within the polymerisation reactor, an undesirable, or a potentially undesirable, reaction condition, a source of gaseous carbon dioxide and connecting means from said source of carbon dioxide to the polymerisation reactor.
Claim 3
Dependent Claim
18 words
A system as claimed in claim 1 which includes means to monitor the temperature within the polymerisation reactor.
Claim 4
Dependent Claim
40 words
A system as claimed in claim 1 or claim 2 wherein the polymerisation reactor is provided with a stirrer to effect stirring of powder within the polymerisation reactor and means are provided to detect failure of rotation of the stirrer.
Claim 5
Dependent Claim
40 words
A system as claimed in claim 3 which includes valve means within the said connecting means and means effective to open said valve means in response to a signal from the detection means on failure of rotation of the stirrer.
Claim 6
Dependent Claim
29 words
A system as claimed in claim 3 or claim 4 wherein the means to detect failure of rotation of the stirrer is a motion switch on the stirrer shaft.
Claim 7
Dependent Claim
52 words
A process of operating a gas-phase olefin polymerisation process which comprises monitoring the process for undesirable, or potentially undesirable, reaction conditions and, when such reaction conditions are detected, introducing a quantity of carbon dioxide into the polymerisation reactor which quantity is sufficient to at least reduce the rate of the polymerisation reaction.
Claim 8
Dependent Claim
52 words
A process of operating a gas-phase olefin polymerisation process which comprises monitoring the process for undesirable, or potentially undesirable, reaction conditions and, when such reaction conditions are detected, introducing a quantity of carbon dioxide into the polymerisation reactor which quantity is sufficient to at least reduce the rate of the polymerisation reaction.
Claim 9
Dependent Claim
29 words
A process as claimed in claim 6 wherein carbon dioxide is added in an amount of at least five times, on a molar basis, the total effective catalyst system.
Claim 10
Dependent Claim
31 words
A process as claimed in claim 6 or claim 7 wherein carbon dioxide is added from 30 seconds up to one minute after detecting the undesirable, or potentially undesirable, reaction conditions.
References Cited (Backward Citations)
No citation records indexed.
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