[미국특허]
Method and apparatus for reducing fouling
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-002/00
C08F-002/14
C08F-004/24
C08F-006/02
C08F-010/00
B01J-019/00
B01J-019/18
C08F-002/38
C08F-110/02
출원번호
US-0483057
(2009-06-11)
등록번호
US-9637570
(2017-05-02)
발명자
/ 주소
Towles, Thomas W.
출원인 / 주소
ExxonMobil Chemical Patents Inc.
대리인 / 주소
Reid, Frank E.
인용정보
피인용 횟수 :
0인용 특허 :
23
초록▼
Provided herein is a method for operating a slurry polymerization reaction system to reduce, inhibit, and/or prevent fouling in the polymer recovery and separation apparatus, including one or more portions of a high pressure flash tank. The method generally comprises polymerizing a monomer feed in a
Provided herein is a method for operating a slurry polymerization reaction system to reduce, inhibit, and/or prevent fouling in the polymer recovery and separation apparatus, including one or more portions of a high pressure flash tank. The method generally comprises polymerizing a monomer feed in a slurry polymerization reactor in the presence of catalyst and diluent to produce a polymerization effluent; continuously discharging at least a portion of said polymerization effluent from the reactor through a discharge valve; combining a catalyst poison stream with the polymerization effluent downstream of said discharge valve, wherein the catalyst poison stream comprises a catalyst poison that is a gas at standard conditions; and flashing the combination of polymerization effluent and catalyst poison stream in a first flash tank.
대표청구항▼
1. A process for producing polymer comprising: a. polymerizing a monomer feed in a slurry polymerization reactor in the presence of a chromium oxide-based catalyst and diluent to produce a polymerization effluent comprising a slurry of polymer solids, unreacted monomer, and diluent;b. continuously d
1. A process for producing polymer comprising: a. polymerizing a monomer feed in a slurry polymerization reactor in the presence of a chromium oxide-based catalyst and diluent to produce a polymerization effluent comprising a slurry of polymer solids, unreacted monomer, and diluent;b. continuously discharging at least a portion of said polymerization effluent from the reactor through a discharge valve;c. continuously combining a catalyst poison stream selected from the group consisting of O2, O3, CO, CO2, NH3, SO, SO2, SO3, or mixtures thereof with the polymerization effluent downstream of said discharge valve, wherein the catalyst poison stream comprises a catalyst poison that is a gas at standard conditions and has a molar ratio of catalyst poison to chromium that is less than 0.1, and wherein the catalyst poison stream comprises at least 70 mol % of a carrier gas;d. flashing the combination of polymerization effluent and the catalyst poison stream in a first flash tank at a pressure greater than or equal to 0.17 MPa to produce a concentrated polymer effluent and a first gas stream comprising vaporized diluent, unreacted monomer, and catalyst poison; ande. condensing the vaporized diluent and unreacted monomer, and removing the catalyst poison from said condensed diluent and monomer as a gas by venting. 2. The process of claim 1, wherein the combination of polymerization effluent and the catalyst poison stream are flashed in the first flash tank at a pressure greater than or equal to 0.34 MPa. 3. The process of claim 1, wherein the catalyst poison stream is injected in one or more of a first transfer conduit leading from the discharge valve to the first flash tank, downstream of a heater on the first transfer conduit leading from the discharge valve to the first flash tank, or in the first flash tank. 4. The process of claim 1, further comprising recycling the condensed diluent to the reactor without the need for further liquid separation. 5. The process of claim 1, further comprising: f. discharging the concentrated polymer effluent from said first flash tank through a seal chamber;g. combining the concentrated polymer effluent with a catalyst poison stream downstream of the seal chamber, wherein the catalyst poison stream comprises a catalyst poison that is a gas at standard conditions; andh. flashing the combination of concentrated polymer effluent and the catalyst poison stream in a second flash tank at a pressure greater than or equal to 34.47 kPa to produce a second concentrated polymer effluent and a second gas stream comprising diluent and catalyst poison. 6. The process of claim 5, wherein the combination of concentrated polymer effluent and the catalyst poison stream are flashed in the second flash tank at a pressure greater than or equal to 48.26 kPa. 7. The process of claim 5, wherein the catalyst poison stream is injected in one or more of a second transfer conduit leading from a second discharge valve to the second flash tank, downstream of a heater on the second transfer conduit leading from the second discharge valve to the second flash tank, or in the second flash tank. 8. The process of claim 1, wherein the diluent is selected from propane, butane, isobutane, pentane, isopentane, neopentane, hexane, cyclohexane, and combinations thereof. 9. The process of claim 1, wherein the catalyst poison is O2. 10. The process of claim 9, wherein the carrier gas comprises N2. 11. The process of claim 1 wherein the catalyst poison stream consists essentially of O2 and N2. 12. The process of claim 1, wherein the amount of catalyst poison introduced is in response to an amount of polymer fouling within the first flash tank. 13. The process of claim 1, wherein the molar ratio of catalyst poison to chromium is less than or equal to 0.05. 14. The process of claim 1, wherein the molar ratio of catalyst poison to chromium is less than or equal to 0.01.
Stricklen Phil M. (Bartlesville OK) Moore Calvin E. (Houston TX) Glascock Dennis G. (Bartlesville OK), Deashing process for polyolefins using an alpha,beta-unsaturated ketone.
Havas Laszlo (Martigues FRX) Lalanne-Magne Claudine (Lavera FRX) Speakman John G. (Martigues FRX), Kill-gas introduction to a fluidized bed reactor containing chromium oxide catalyst.
Craddock ; III Roy E. (Rte. 7 ; Box 253-A So. Charleston WV 25309) Jenkins ; III John M. (1405 Village Dr. So. Charleston WV 25309) Tighe Michael T. (1386 Nottingham Rd. Charleston WV 25314), Method and apparatus for stopping reaction in a gas phase polymerization reactor system.
Craddock ; III Roy E. (So. Charleston WV) Jenkins ; III John M. (So. Charleston WV) Tighe Michael T. (Charleston WV), Method and apparatus for stopping reaction in a gas phase polymerization reactor system.
Stevens Jack F. (Naperville IL) Lee Kwok-fu (Glen Ellyn IL) Rose Philip M. (Naperville IL) Kreider David R. (Wheaton IL) Lin Chi-Hung (Wheaton IL), Method for emergency shutdown of gas phase polyolefin reactor.
Cook, John E.; Hagerty, Robert O.; Jacob, Frederick W., Method for rapid kill gas injection to gas phase polymerization reactors during power failures.
Etherton Bradley P. ; Hlatky Gregory G. ; Meas ; Jr. James H., Olefin polymerization process with fatty amine additives for improved activity and reduced fouling.
Reid, Thomas A.; Kufeld, Scott E.; Tait, John H.; Burns, David H.; Verser, Donald W., Process and apparatus for separating diluent from polymer solids.
Baade Wolfgang (Odenthal DEX) Heinrich Roland (Leverkusen DEX) Langstein Gerhard (Kurten DEX) Mulder Thomas (Koln DEX) Puskas Judit (Ontario CAX), Process for the production of polyisoolefins.
Cook John E. (Westfield NJ) Hagerty Robert O. (Edison NJ) Jacob Frederick W. (Houston TX), Reactor system for rapid kill gas injection to gas phase polymerization reactors.
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