Patent EP0241947A2 successfully refreshed from Google Patents.
EP0241947A2
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A method for controlling the temperature of a fluidized bed especially a process for producing polymers
Assignee: Union Carbide Corp
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Filing: 1983-03-23
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Granted: —
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Expires: 2003-03-23
Abstract
Abstract A process is described for a method for controlling the temperature of a fluidized bed during the production of polymers in a fluidized bed reactor by an exothermic polymerization reaction, which comprises continuously introducing into the bed a stream of gas cooled to below the maximum desired temperature within said bed and simultaneously or separately introducing a stream of liquid into said reactor under conditions such that an essentially uniform two-phase mixture of said gas and liquid is introduced in said bed at a level below the region of maximum desired temperature within said reactor. This invention also refers to a process for producing polymers from one or more monomers by an exothermic polymerization reaction in a fluidized bed reactor in which the way of operation mentioned above is performed.
Inventors
- 👤 John Mitchell Jenkins, Iii
- 👤 Russell Lawrence Jones
- 👤 Thomas Michael Jones
- 👤 Samil Beret
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 12:54
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/34; B; B01; B01J; B01J8/00; B01J8/18; B01J8/1809; B01J8/1836; C08F10/00; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00168; B01J2208/00256; B01J2208/00265; B01J2208/00274; B01J2208/00292; B01J2208/00327; B01J2208/00336; B01J2208/00353; B01J2208/00371; B01J2208/00743; B01J2208/00761
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
90 words
A method for controlling the temperature of a fluidized bed during the production of polymers in a fluidized bed reactor by an exothermic polymerization reaction, which comprises continuously introducing into the bed a stream of gas cooled to below the maximum desired temperature within said bed and simultaneously or separately introducing a stream of liquid into said reactor under conditions such that an essentially uniform two-phase mixture of said gas and liquid is introduced in said bed at a level below the region of maximum desired temperature within said reactor.
Claim 2
Independent Claim
90 words
A method for controlling the temperature of a fluidized bed during the production of polymers in a fluidized bed reactor by an exothermic polymerization reaction, which comprises continuously introducing into the bed a stream of gas cooled to below the maximum desired temperature within said bed and simultaneously or separately introducing a stream of liquid into said reactor under conditions such that an essentially uniform two-phase mixture of said gas and liquid is introduced in said bed at a level below the region of maximum desired temperature within said reactor.
Claim 3
Dependent Claim
43 words
A method according to claim 1 for controlling the temperature of a fluidized bed during the production of polymers in a fluidized bed reactor, by an exothermic polymerization reaction, which comprises continuously introducing into said bed an essentially uniform gas-liquid mixture containing monomer.
Claim 4
Dependent Claim
117 words
A process for producing polymers from one or more monomers by an exothermic polymerization reaction in a fluidized bed reactor having an upper polymerization zone containing a bed of growing polymer particles and a lower gas diffusion zone, which comprises: 1) continuously introducing a two-phase gas-liquid stream containing one or more monomers into said polymerization zone with an upward velocity sufficient to maintain said particles in a suspended and gas fluidized condition; 2) continuously introducing a polymerization catalyst into said polymerization zone; 3) continuously withdrawing polymer product from said polymerization zone; and 4) continuously withdrawing unreacted gases from the said polymerization zone, compressing and cooling said gases to a temperature below the dew point of said gases.
Claim 5
Dependent Claim
117 words
A process for producing polymers from one or more monomers by an exothermic polymerization reaction in a fluidized bed reactor having an upper polymerization zone containing a bed of growing polymer particles and a lower gas diffusion zone, which comprises: 1) continuously introducing a two-phase gas-liquid stream containing one or more monomers into said polymerization zone with an upward velocity sufficient to maintain said particles in a suspended and gas fluidized condition; 2) continuously introducing a polymerization catalyst into said polymerization zone; 3) continuously withdrawing polymer product from said polymerization zone; and 4) continuously withdrawing unreacted gases from the said polymerization zone, compressing and cooling said gases to a temperature below the dew point of said gases.
Claim 6
Dependent Claim
26 words
A process according to claim 3 wherein said two-phase mixture of gas and entrained liquid is introduced into said reactor at a point below the'polymerization zone.
Claim 7
Dependent Claim
15 words
A process according to claim 3 wherein said unreacted fluids are compressed prior to cooling.
Claim 8
Dependent Claim
25 words
A process according to claim 3 wherein an inert condensible fluid is present in said two-phase mixture to raise the dew point of said mixture.
Claim 9
Dependent Claim
16 words
An improved process according to claim 6 wherein said inert condensible fluid is a saturated hydrocarbon.
Claim 10
Dependent Claim
30 words
A process according to claim 3 wherein the liquid phase of said two-phase mixture is less than about 20 percent by weight of the total weight of said two-phase mixture.
Claim 11
Dependent Claim
30 words
A process according to claim 3 wherein the liquid phase of said two-phase mixture is less than about 10 percent by weight of the total weight of said two-phase mixture.
Claim 12
Dependent Claim
48 words
A process according to claim 3 wherein the flow rate of said two phase mixture and the ratio of liquid to gas in said mixture are maintained at a level sufficient to maintain said liquid entrained in said gas until volatilized or until entry into said polymerization zone.
Claim 13
Dependent Claim
53 words
A process according to claim 3 wherein the gas stream riowing upwardly through said fluidized bed is essentially uniform in composition and moving in a manner through said bed such that the entire bed is maintained in a . fluidized condition and with essentially no dead spaces through which gases do not pass.
Claim 14
Dependent Claim
47 words
A process according to claim 3 wherein additional quantities of one or more monomers in liquid or gaseous form are added to replace monomers polymerized and withdrawn as product, below the polymerization zone and at or near the point of entry of said two-phase mixture-into said reactor.
Claim 15
Dependent Claim
41 words
A process according to claim 3 wherein additional quantities of one or more monomers are added to replace monomers polymerized and withdrawn as product by injection into the gas-liquid stream prior to entry of the said two-phase mixture into the reactor.
Claim 16
Dependent Claim
17 words
A process according to claim 3 wherein gas distributor means is provided immediately below said polymerization zone.
Claim 17
Dependent Claim
22 words
A process according to claim 3 wherein the internal pressure within said reactor is from about 100 psi to about 350 psi.
Claim 18
Dependent Claim
44 words
A process according to claim 3 wherein said polymer is produced by reaction of an alpha olefin monomer having from two to four carbon atoms alone or in admixture with one or more other alpha olefin monomers having from two to eight carbon atoms.
References Cited (Backward Citations)
No citation records indexed.
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