EP0136029A2
Expired / Lapsed
EP
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Method and system for injecting a kill gas into a gas phase catalytic polymerization reactor
Assignee: Mobil Oil AS
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Filing: 1984-08-13
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Granted: —
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Expires: 2004-08-13
Abstract
Abstract In a method for terminating a gas phase olefin polymerization reaction with a kill gas such as carbonmonoxide or carbon dioxide, a carrier gas is used to increase the rate of penetration of kill gas into the reaction medium.
Inventors
- 👤 John Edward Cook
- 👤 Robert Olds Hagerty
- 👤 Frederick William Jacob
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 20:57
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1809; B01J19/00; B01J19/0006; B01J19/002; C; C08; C08F; C08F10/00; B01J2208/00; B01J2208/00008; B01J2208/00628; B01J2208/00637; B01J2219/00; B01J2219/00049; B01J2219/00245; B01J2219/00272
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
A method for terminating a gas phase catalytic olefin polymerization reaction, said method comprising the injection of an amount of kill gas into the reaction medium sufficient to terminate the reaction, wherein to increase the rate of penetration of kill gas into the reaction medium a non-catalyst-poisoning carrier gas is injected into the reaction medium together with said kill gas.
Claim 2
Independent Claim
60 words
A method for terminating a gas phase catalytic olefin polymerization reaction, said method comprising the injection of an amount of kill gas into the reaction medium sufficient to terminate the reaction, wherein to increase the rate of penetration of kill gas into the reaction medium a non-catalyst-poisoning carrier gas is injected into the reaction medium together with said kill gas.
Claim 3
Independent Claim
155 words
A method for terminating a gas phase catalytic olefin polymerization reaction in a fluid bed reactor system, said reactor system comprising a vertical reactor wherein said polymerization takes place and a fluidizing medium recycle means in fluid communication with said reactor and powered by a compressor, said method being actuated in the event of failure of said compressor and comprising the steps of: (i) closing off said recycle means by closing one or more valves in said recycle means; (ii) injecting an amount of carbon oxide gas sufficient to terminate said polymerization, said injection taking place adjacent the bottom of said reactor at a point below the polymer bed in said reactor; (iii) venting gas from adjacent the top of the reactor at a point above said polymer bed; and (iv) injecting a non-catalyst-poisoning carrier gas into the reactor adjacent the bottom of said reactor at a point below the polymer bed in said reactor.
Claim 4
Independent Claim
155 words
A method for terminating a gas phase catalytic olefin polymerization reaction in a fluid bed reactor system, said reactor system comprising a vertical reactor wherein said polymerization takes place and a fluidizing medium recycle means in fluid communication with said reactor and powered by a compressor, said method being actuated in the event of failure of said compressor and comprising the steps of: (i) closing off said recycle means by closing one or more valves in said recycle means; (ii) injecting an amount of carbon oxide gas sufficient to terminate said polymerization, said injection taking place adjacent the bottom of said reactor at a point below the polymer bed in said reactor; (iii) venting gas from adjacent the top of the reactor at a point above said polymer bed; and (iv) injecting a non-catalyst-poisoning carrier gas into the reactor adjacent the bottom of said reactor at a point below the polymer bed in said reactor.
Claim 5
Dependent Claim
21 words
A method according to claim 1 or claim 2, wherein said carrier gas is selected from ethylene, argon, helium and nitrogen.
Claim 6
Dependent Claim
28 words
A method according to claim 1 or claim 2, wherein said kill gas is injected at a point upstream from the point of injection of said carrier gas.
Claim 7
Dependent Claim
31 words
A method according to claim 1 or claim 2, wherein the amount of said carrier gas comprises at least 90 mol percent of the total of kill gas and carrier gas.
Claim 8
Independent Claim
92 words
A method for terminating a gas phase catalytic olefin polymerization reaction during a power failure, said olefin polymerization reaction taking place in a reactor having a gas recycle means equipped with a compressor capable of producing a coast-down flow of recycle gas for at least one minute during a power failure, said method comprising injecting an amount of kill gas into said recycle means sufficient to terminate the olefin polymerization reaction, whereby said kill gas is carried into the reaction medium by said coast-down flow of recycle gas during said power failure.
Claim 9
Independent Claim
92 words
A method for terminating a gas phase catalytic olefin polymerization reaction during a power failure, said olefin polymerization reaction taking place in a reactor having a gas recycle means equipped with a compressor capable of producing a coast-down flow of recycle gas for at least one minute during a power failure, said method comprising injecting an amount of kill gas into said recycle means sufficient to terminate the olefin polymerization reaction, whereby said kill gas is carried into the reaction medium by said coast-down flow of recycle gas during said power failure.
Claim 10
Independent Claim
23 words
A method according to any preceding claim , wherein said reaction is carried out in a fluid bed or a stirred bed reactor.
Claim 11
Independent Claim
20 words
A method according to any preceding claim , wherein said kill gas is selected from carbon oxides, oxygen and air.
Claim 12
Independent Claim
33 words
A method according to any preceding claim and further comprising the steps of: (v) discontinuing the introduction of catalyst into said reactor; and (vi) discontinuing the introduction of olefin reactant into said reactor.
Claim 13
Dependent Claim
526 words
A fluid bed reactor system in which olefin monomers may be catalytically polymerized continuously in a fluid bed under gas medium fluidized conditions, comprising: a vertical reactor having a cylindrical lower section, an upper section having a cross section greater than that of said lower section, said lower section being adapted to house a polymerization zone in which the catalyzed polymerization reaction may be conducted under gas medium fluidized fluid bed conditions, and said upper section being adapted to function as a velocity reduction zone for the recovery of particles entrained in fluidizing medium entering said upper section from said lower section, and fluidizing medium permeable distribution plate means within and towards the base of said lower section, said distribution plate means being adapted to diffuse fluidizing medium up through the fluidized bed in said lower section and to support said bed thereon when said bed is quiescent; fluidizing medium supply means in gas communication with, and adapted to supply fluidizing medium and make up gas to, the lower section of said reactor and below said distribution plate means; catalyst injection means in communication with, and adapted to supply particulate olefin polymerization catalyst to, the polymerization zone in said lower section; polymer product recovery means in polymer communication with, and adapted to recover polymer product from, the base of said polymerization zone and above said distribution plate means; fluidizing medium recycle means in communication with said reactor and adapted to recover fluidizing medium from the upper section of said reactor and to recycle the thus recovered fluidizing medium to the lower section of said reactor at a point below said distribution plate means, said fluidizing medium recycle line means being powered by a compressor; heat exchange means within said recycle means adapted to remove heat of reaction from the recycled fluidizing medium; gas analyzer means in communication with said velocity reduction zone and adapted to analyze gas component deficiency in the fluidizing medium in said velocity reduction zone; said fluidizing medium supply means being in communication with said recycle means and said gas analyzer means and being adapted to supply deficient components of the fluidizing medium to said recycle means in response to an activation signal from said gas analyzer means; valve means capable of closing off said fluidizing medium recycle means when said compressor is not operating; injection means capable of injecting carbon oxide into said reactor below said distribution plate means; venting means for venting gas from the top of said reactor; carrier gas injection means capable of injecting nitrogen into said reactor below said distribution plate means; and automatic reaction kill initiating means comprising a compressor failure sensing means in operative connection with said valve means, carbon oxide injection means, said venting means and said carrier gas injection means, said kill initiating means being capable of sensing failure of said compressor and automatically actuating said valve means, said carbon oxide injection means, said venting means and said nitrogen carrier gas means, whereby said fluidizing medium recycle means is closed off, gas is vented from the top of said reactor, and carbon oxide carried by said nitrogen carrier gas is passed through said bed.
Claim 14
Dependent Claim
526 words
A fluid bed reactor system in which olefin monomers may be catalytically polymerized continuously in a fluid bed under gas medium fluidized conditions, comprising: a vertical reactor having a cylindrical lower section, an upper section having a cross section greater than that of said lower section, said lower section being adapted to house a polymerization zone in which the catalyzed polymerization reaction may be conducted under gas medium fluidized fluid bed conditions, and said upper section being adapted to function as a velocity reduction zone for the recovery of particles entrained in fluidizing medium entering said upper section from said lower section, and fluidizing medium permeable distribution plate means within and towards the base of said lower section, said distribution plate means being adapted to diffuse fluidizing medium up through the fluidized bed in said lower section and to support said bed thereon when said bed is quiescent; fluidizing medium supply means in gas communication with, and adapted to supply fluidizing medium and make up gas to, the lower section of said reactor and below said distribution plate means; catalyst injection means in communication with, and adapted to supply particulate olefin polymerization catalyst to, the polymerization zone in said lower section; polymer product recovery means in polymer communication with, and adapted to recover polymer product from, the base of said polymerization zone and above said distribution plate means; fluidizing medium recycle means in communication with said reactor and adapted to recover fluidizing medium from the upper section of said reactor and to recycle the thus recovered fluidizing medium to the lower section of said reactor at a point below said distribution plate means, said fluidizing medium recycle line means being powered by a compressor; heat exchange means within said recycle means adapted to remove heat of reaction from the recycled fluidizing medium; gas analyzer means in communication with said velocity reduction zone and adapted to analyze gas component deficiency in the fluidizing medium in said velocity reduction zone; said fluidizing medium supply means being in communication with said recycle means and said gas analyzer means and being adapted to supply deficient components of the fluidizing medium to said recycle means in response to an activation signal from said gas analyzer means; valve means capable of closing off said fluidizing medium recycle means when said compressor is not operating; injection means capable of injecting carbon oxide into said reactor below said distribution plate means; venting means for venting gas from the top of said reactor; carrier gas injection means capable of injecting nitrogen into said reactor below said distribution plate means; and automatic reaction kill initiating means comprising a compressor failure sensing means in operative connection with said valve means, carbon oxide injection means, said venting means and said carrier gas injection means, said kill initiating means being capable of sensing failure of said compressor and automatically actuating said valve means, said carbon oxide injection means, said venting means and said nitrogen carrier gas means, whereby said fluidizing medium recycle means is closed off, gas is vented from the top of said reactor, and carbon oxide carried by said nitrogen carrier gas is passed through said bed.
References Cited (Backward Citations)
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