WO2000026258A1 - Method for eliminating static electricity - Google Patents
Method for eliminating static electricity Download PDFInfo
- Publication number
- WO2000026258A1 WO2000026258A1 PCT/FI1999/000919 FI9900919W WO0026258A1 WO 2000026258 A1 WO2000026258 A1 WO 2000026258A1 FI 9900919 W FI9900919 W FI 9900919W WO 0026258 A1 WO0026258 A1 WO 0026258A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- powder
- flow
- charge
- added
- static electricity
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1872—Details of the fluidised bed reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00008—Controlling the process
- B01J2208/00734—Controlling static charge
Definitions
- the present invention relates to the conveyance of polymer powders. More particularly, the invention concerns the elimination of static electricity formed during the conveyance.
- the invention can be used especially in multistage polymerization processes.
- WO 96/18662 describes a multistage process for preparing polyethylene. Ethylene is first polymerized in liquid phase in loop reactors and then in a gas phase reactor. After the loop reactors gases and liquids are removed from the reaction mixture in a flash stage and only the solid polymer powder is conveyed into the gas phase reactor.
- Static electricity is a known problem also in fluidized bed reactors. This causes for example sheeting during the polymerization of alpha-olefins.
- US 4 803 251 describes a method for reducing such sheeting by adding a charge generating chemical directly into the reactor.
- the chemical is an alcohol containing up to 7 carbon atoms, oxygen or nitric oxide, if negative static charge is indicated, or a ketone containing up to 7 carbon atoms, if positive static charge is indicated.
- an antistatic chemical is added into the flow of the polymer powder.
- different chemicals may be added. If the charge is positive, a negative charge generating chemical is added, and if the charge is negative, a positive charge genetrating chemical is added.
- the antistatic chemical especially improves the flow properties of the powder.
- the invention can be used for example in multistage polymerizing processes, when polymer powder has to be conveyed from one process stage to another.
- Figure 1 is a schematic representation of a part of a multistage polymerization process.
- Figure 2 is a schematic representation of the feeding system of polymer powder into the gas phase reactor of the process.
- the invention relates to processes in which polymer powder is conveyed especially pneumatically through a pipeline system, typically from one vessel to another.
- the first vessel may be for example a separator, and the second vesssel a reactor.
- the pipeline system comprises a conduit and possibly also additional vessels for storing and feeding the polymer powder.
- a pneumatic system is provided with suitable means for feeding carrier gas into into the pipeline.
- the carrier gas is preferably inert.
- the carrier gas may be separated from the powder before the second vessel. In this case the powder is fed into the second vessel by separate means, such as by gravity flow or by suitable conveying means.
- the carrier gas is usually recycled.
- the polymer may be especially polyalkylene, such as polyethylene or polypropylene.
- Antistatic chemical is fed into the pipeline system in order to eliminate the formation of static electricity during the conveyance.
- the charge of the powder is measured in the second vessel or in the pipeline equipment and the feed of the chemical is controlled based on the measurement.
- the chemical is water, or ketone, if the charge is positive, and an alcohol, oxygen or nitric oxide, if the charge is negative.
- the alcohol contains preferably 1 to 10 carbon atoms.
- the chemical is preferably fed into the pipeline equipment in the first possible connection.
- the amount of the antistatic chemical may be, for example, 0.1-100, preferably 1- 10, and most preferably 2-5, moles per ton of the powder.
- reaction mixture 1 from a first polymerization stage is fed into a flash separator 2.
- the mixture contains polymer and gases in a liquid medium comprising low boiling hydrocarbons.
- the hydrocarbons are evaporated and the polymer is recovered as a solid powder.
- the evaporated hydrocarbons are returned into the firststage.
- the polymer powder obtained from the separator also contains the solid catalyst from the first polymerization stage.
- the first stage process is preferably such as described in WO 96/18662 and comprises two successive loop reactors for carrying out a liquid polymerization.
- the polymer powder is pneumatically conveyed via a conduit 3 into a first feed tank 4.
- the nitrogen used to convey the polymer powder is dilivered by a compressor 5.
- nitrogen is separated from the powder and returned to the compressor.
- the powder from the first feed tank is led by gravity flow into a second feed tank 6, from which it is fed pneumatically into a gas phase reactor 7.
- valves 13, 14 and 15 are closed.
- the valves isolate a section 16 from the rest of the piping.
- valve 13 is opened, powder falls into section 16.
- valve 14 is closed.
- section 16 is pressurised with nitrogen to a pressure which is higher than that in the reactor.
- valve 14 is closed.
- valve 15 is opened, and the high pressure in section 16 causes its contents to be discharged via the conduit into the reactor.
- the lower part of reactor 7 contains a bed of polymer particles.
- the bed is kept in a fluidized state by a gas flow moving upwards in the reactor.
- the unreacted gas is collected from the top of the reactor and pressurised using a compressor.
- the pressurised gas is then recycled into the bottom part of the reactor thus establishing the upwardly moving gas flow.
- Monomer and other possible components such as comonomers and hydrogen can be fed into the lower part of the reactor.
- the product is removed from the reactor into a product tank 8.
- the pipeline system is earth connected 9 in order to reduce static electricity.
- the formation of the static electricity depends on the nature of the polymer, reaction conditions, conveying conditions, catalyst, and on the materials of the conveying system. In most cases the charge is positive, but especially certain impurities in the polymerization gases cause negative charges.
- Reactor 7 is provided with one or several charge indicators 10 in order to measure the possible static charge of the polymer powder.
- antistatic chemical is added by dosing equipment 11 into the nitrogen flow after the compressor 4.
- the amount of the chemical is controlled through a line 12 in accordance with the level of the measured charge.
- the antistatic chemical is water, if the measured charge is positive, and propanol, if the charge is negative.
- the typical capacity was such that the production rate in the first stage was 6 tons per hour.
- the nitrogen feed was 1.2 tons per hour.
- the dose of the antistatic chemical needed to eliminate the static electricity was on an average 20 moles per hour (about 3.3 mol per ton of the powder).
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Polymerisation Methods In General (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99971430A EP1159303A1 (en) | 1998-11-04 | 1999-11-04 | Method for eliminating static electricity |
AU11637/00A AU1163700A (en) | 1998-11-04 | 1999-11-04 | Method for eliminating static electricity |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI982388A FI982388A (sv) | 1998-11-04 | 1998-11-04 | Förfarande för eliminerining av statisk elektricitet |
FI982388 | 1998-11-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000026258A1 true WO2000026258A1 (en) | 2000-05-11 |
Family
ID=8552841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI1999/000919 WO2000026258A1 (en) | 1998-11-04 | 1999-11-04 | Method for eliminating static electricity |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1159303A1 (sv) |
AU (1) | AU1163700A (sv) |
FI (1) | FI982388A (sv) |
WO (1) | WO2000026258A1 (sv) |
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EP2090357A1 (en) | 2007-12-24 | 2009-08-19 | Borealis Technology OY | Reactor system and process for the catalytic polymerization of olefins, and the use of such reactor system in catalytic polymerization of olefins |
EP2090356A1 (en) | 2007-12-24 | 2009-08-19 | Borealis Technology OY | Reactor systems and process for the catalytic polymerization of olefins, and the use of such reactor system in catalytic polymeration of olefins |
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EP2130863A1 (en) | 2008-06-02 | 2009-12-09 | Borealis AG | High density polymer compositions, a method for their preparation and pressure-resistant pipes made therefrom |
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EP2182525A1 (en) | 2008-10-31 | 2010-05-05 | Borealis AG | Cable and polymer composition comprising a multimodal ethylene copolymer |
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EP2223943A1 (en) | 2009-02-25 | 2010-09-01 | Borealis AG | Multimodal polymer of propylene, composition containing the same and a process for manufacturing the same |
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WO2011058088A1 (en) | 2009-11-13 | 2011-05-19 | Borealis Ag | Process for recovering a transition metal compound |
WO2011058089A1 (en) | 2009-11-13 | 2011-05-19 | Borealis Ag | Process for producing a polymerization catalyst |
EP2397221A1 (en) | 2010-06-17 | 2011-12-21 | Borealis AG | Control system for a gas phase reactor, a gas phase reactor for catalytic production of polyolefines, a method for catalytic productions of polyolefines and a use of the control system |
EP2452959A1 (en) | 2010-11-12 | 2012-05-16 | Borealis AG | Process for producing propylene random copolymers and their use |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4803251A (en) * | 1987-11-04 | 1989-02-07 | Union Carbide Corporation | Method for reducing sheeting during polymerization of alpha-olefins |
US5688865A (en) * | 1991-03-06 | 1997-11-18 | Mobil Oil Corporation | Process and system for preventing pressure tap fouling in tandem polymerization reactors |
US5733988A (en) * | 1994-06-29 | 1998-03-31 | Union Carbide Chemicals & Plastics Technology Corporation | Process for reducing polymer build-up in recycle lines and heat exchangers during polymerizations employing butadiene, isoprene, and/or styrene |
-
1998
- 1998-11-04 FI FI982388A patent/FI982388A/sv unknown
-
1999
- 1999-11-04 EP EP99971430A patent/EP1159303A1/en not_active Withdrawn
- 1999-11-04 WO PCT/FI1999/000919 patent/WO2000026258A1/en not_active Application Discontinuation
- 1999-11-04 AU AU11637/00A patent/AU1163700A/en not_active Abandoned
Patent Citations (3)
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US4803251A (en) * | 1987-11-04 | 1989-02-07 | Union Carbide Corporation | Method for reducing sheeting during polymerization of alpha-olefins |
US5688865A (en) * | 1991-03-06 | 1997-11-18 | Mobil Oil Corporation | Process and system for preventing pressure tap fouling in tandem polymerization reactors |
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AU1163700A (en) | 2000-05-22 |
FI982388A (sv) | 2000-05-05 |
EP1159303A1 (en) | 2001-12-05 |
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