[미국특허]
Methods for removing polymer skins from reactor walls
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-002/00
C08F-004/00
C08F-004/44
C08F-210/00
출원번호
US-0307053
(2011-11-30)
등록번호
US-8487053
(2013-07-16)
발명자
/ 주소
Rajaendran, George R.
McDaniel, Max P.
Hendrickson, Gregory G.
Stewart, John D.
Hottovy, John D.
Cymbaluk, Ted H.
Lane, Susannah
Hernandez, Richard A.
Johnson, Elliott W.
Yang, Qing
Valerioti, William L.
Schwerdtfeger, Eric
Masino, Albert P.
출원인 / 주소
Chevron Phillips Chemical Company LP
대리인 / 주소
Merchant & Gould P.C.
인용정보
피인용 횟수 :
0인용 특허 :
90
초록▼
Methods for removing polymer skins or build-up from reactor walls in polymerization reactor systems containing a loop slurry reactor are disclosed. Such methods can employ removing some or all of the comonomer from the reactor system in combination with increasing the polymerization temperature of t
Methods for removing polymer skins or build-up from reactor walls in polymerization reactor systems containing a loop slurry reactor are disclosed. Such methods can employ removing some or all of the comonomer from the reactor system in combination with increasing the polymerization temperature of the loop slurry reactor.
대표청구항▼
1. A method for removing polymer skins from reactor walls in a polymerization reactor system comprising a loop slurry reactor, the method comprising: (1) contacting a catalyst system, an olefin monomer, and an olefin comonomer in the loop slurry reactor under polymerization conditions to produce an
1. A method for removing polymer skins from reactor walls in a polymerization reactor system comprising a loop slurry reactor, the method comprising: (1) contacting a catalyst system, an olefin monomer, and an olefin comonomer in the loop slurry reactor under polymerization conditions to produce an olefin copolymer;(2) monitoring a process variable in the polymerization reactor system to detect a condition indicative of polymer skin formation on the reactor walls, wherein the condition indicative of polymer skin formation comprises a decrease in heat transfer coefficient, a decrease in slurry circulation velocity, an increase in circulation pump pressure drop, an increase in pump power consumption, or any combination thereof; and(3) in response to the detection of the condition indicative of polymer skin formation on the reactor walls, (a) removing some or all of the olefin comonomer to produce an olefin polymer having a density at least 0.015 g/cc higher than the olefin copolymer density; and (b) increasing a polymerization temperature of the loop slurry reactor by at least 6° C. (11° F.);wherein the method results in an increase in a heat transfer coefficient of the loop slurry reactor of at least 28 W/m2/° C. (4.9 BTU/hr/ft2/° F.). 2. The method of claim 1, wherein: the polymerization conditions in step (1) comprise a polymerization temperature of less than 82° C. (180° F.);the polymerization temperature of the loop slurry reactor in step (3) increases to at least 88° C. (190° F.);the polymerization temperature of the loop slurry reactor increases by at least 11° C. (20° F.);or any combination thereof. 3. The method of claim 1, wherein: the olefin copolymer density is less than 0.925 g/cc;the olefin polymer density is greater than 0.935 g/cc;the olefin polymer density is at least 0.02 g/cc higher than the olefin copolymer density;or any combination thereof. 4. The method of claim 1, wherein: the heat transfer coefficient of the loop slurry reactor increases by at least 57 W/m2/° C. (10 BTU/hr/ft2/° F.);the heat transfer coefficient of the loop slurry reactor increases by at least 5%;or both. 5. The method of claim 1, wherein: a ratio of circulation velocity in the loop slurry reactor to pump pressure drop of the loop slurry reactor increases by at least 27,450 L/min/MPa (50 gallons/min/psi);a ratio of circulation velocity in the loop slurry reactor to pump pressure drop of the loop slurry reactor increases by at least 10%;a ratio of loop slurry reactor pump power consumption to slurry density in the loop reactor decreases by at least 31,214 W/g/cc (500 W/lb/ft3);a ratio of loop slurry reactor pump power consumption to slurry density in the loop reactor decreases by at least 5%;or any combination thereof. 6. The method of claim 1, wherein steps (a) and (b) are performed sequentially. 7. The method of claim 1, wherein the olefin monomer comprises ethylene. 8. The method of claim 7, wherein the olefin comonomer comprises 1-butene, 1-hexene, 1-octene, or combination thereof. 9. The method of claim 1, wherein the catalyst system comprises chromium, vanadium, titanium, zirconium, hafnium, or a combination thereof. 10. The method of claim 1, wherein the catalyst system is a chromium-based catalyst system, a Ziegler-based catalyst system, a metallocene-based catalyst system, or a combination thereof. 11. The method of claim 1, wherein the catalyst system is a metallocene-based catalyst system. 12. The method of claim 1, wherein the catalyst system is a dual catalyst system comprising at least one metallocene compound. 13. The method of claim 1, wherein the catalyst system is a dual catalyst system comprising two different metallocene compounds. 14. A method for removing polymer skins from reactor walls in a polymerization reactor system comprising a loop slurry reactor, wherein the polymer skins are present on at least a portion of the reactor walls, the method comprising: (I) a first polymerization step comprising contacting a catalyst system, an olefin monomer, and a first olefin comonomer in the loop slurry reactor under first polymerization conditions to produce an olefin copolymer;(II) a second polymerization step comprising (a) removing some or all of the first olefin comonomer to produce an olefin polymer having a density at least 0.015 g/cc higher than the olefin copolymer density; and (b) increasing a polymerization temperature of the loop slurry reactor by at least 6° C. (11° F.); and(III) a third polymerization step comprising contacting the catalyst system, the olefin monomer, and the first olefin comonomer in the loop slurry reactor under conditions substantially the same as the first polymerization conditions to produce the olefin copolymer;wherein, when measured at the same reactor temperature and weight percent solids, a heat transfer coefficient of the loop slurry reactor in step (III) is at least 28 W/m2/° C. (4.9 BTU/hr/ft2/° F.) higher than a heat transfer coefficient of the loop slurry reactor in step (I). 15. The method of claim 14, wherein: the polymerization temperature of the loop slurry reactor increases by at least 17° C. (30° F.);the olefin polymer density is at least 0.03 g/cc higher than the olefin copolymer density;a ratio of circulation velocity in the loop slurry reactor to pump pressure drop of the loop slurry reactor in step (III) is at least 54,900 L/min/MPa (100 gallons/min/psi) higher than a ratio of circulation velocity in the loop slurry reactor to pump pressure drop of the loop slurry reactor in step (I);a ratio of loop slurry reactor pump power consumption to slurry density in the loop reactor in step (III) is at least 62,428 W/g/cc (1000 W/lb/ft3) less than a ratio of loop slurry reactor pump power consumption to slurry density in the loop reactor in step (I);or any combination thereof. 16. A method for removing polymer skins from reactor walls in a polymerization reactor system comprising a loop slurry reactor, wherein the polymer skins are present on at least a portion of the reactor walls, the method comprising: (a) removing some or all of an olefin comonomer from the polymerization reactor system to increase polymer density by at least 0.015 g/cc; and(b) increasing a polymerization temperature of the loop slurry reactor by at least 6° C. (11° F.);wherein a heat transfer coefficient of the loop slurry reactor increases by at least 28 W/m2/° C. (4.9 BTU/hr/ft2/° F.). 17. The method of claim 16, wherein the heat transfer coefficient of the loop slurry reactor increases by at least 57 W/m2/° C. (10 BTU/hr/ft2/° F.). 18. The method of claim 16, wherein: the polymer density is increased by at least 0.02 g/cc;the polymerization temperature is increased by at least 11° C. (20° F.);the heat transfer coefficient of the loop slurry reactor is increased by at least 10%;the heat transfer coefficient of the loop slurry reactor is increased by at least 114 W/m2/° C. (20 BTU/hr/ft2/° F.);the conditions of steps (a) and (b) are maintained for at least 4 days;or any combination thereof. 19. The method of claim 16, wherein the method further comprises monitoring a process variable to detect an undesired condition in the polymerization reactor system, and when the undesired condition has reached a predetermined critical level, performing step (a) and step (b). 20. The method of claim 16, wherein: the olefin comonomer comprises 1-butene, 1-hexene, 1-octene, or combination thereof;the polymer density is increased by from 0.015 to 0.06 g/cc;the polymerization temperature is increased by from 6° C. (11° F.) to 25° C. (45° F.); andthe heat transfer coefficient of the loop slurry reactor is increased by from 2% to 20%. 21. The method of claim 20, wherein: a ratio of circulation velocity in the loop slurry reactor to pump pressure drop of the loop slurry reactor increases by from 5% to 50%;a ratio of loop slurry reactor pump power consumption to slurry density in the loop reactor decreases by from 2% to 20%; orboth. 22. The method of claim 14, wherein the catalyst system comprises chromium, vanadium, titanium, zirconium, hafnium, or a combination thereof. 23. The method of claim 14, wherein the catalyst system comprises at least one metallocene compound. 24. The method of claim 14, wherein: the olefin monomer comprises ethylene, and the first olefin comonomer comprises 1-butene, 1-hexene, 1-octene, or combination thereof;the olefin polymer density is from 0.015 to 0.06 g/cc higher than the olefin copolymer density;the polymerization temperature is increased by from 6° C. (11° F.) to 25° C. (45° F.); andthe heat transfer coefficient of the loop slurry reactor in step (III) is from 2% to 20% higher than a heat transfer coefficient of the loop slurry reactor in step (I). 25. The method of claim 24, wherein: a ratio of circulation velocity in the loop slurry reactor to pump pressure drop of the loop slurry reactor in step (III) is from 5% to 50% higher than a ratio of circulation velocity in the loop slurry reactor to pump pressure drop of the loop slurry reactor in step (I);a ratio of loop slurry reactor pump power consumption to slurry density in the loop reactor in step (III) is from 2% to 20% less than a ratio of loop slurry reactor pump power consumption to slurry density in the loop reactor in step (I);or both. 26. The method of claim 24, wherein the catalyst system is a metallocene-based catalyst system. 27. The method of claim 24, wherein the catalyst system is a dual catalyst system comprising at least one metallocene compound.
McDaniel Max P. (Bartlesville OK) Johnson Marvin M. (Bartlesville OK), Acid gelling aluminum phosphate from concentrated mass and catalyst containing same.
Hottovy John D. (Bartlesville OK) Lawrence Frederick C. (Bartlesville OK) Lowe Barry W. (Bartlesville OK) Fangmeier James S. (Bartlesville OK), Apparatus and method for producing ethylene polymer.
McDaniel Max P. ; Benham Elizabeth A. ; Martin Shirley J. ; Collins Kathy S. ; Smith James L. ; Hawley Gil R. ; Wittner Christopher E. ; Jensen Michael D., Compositions that can produce polymers.
Frey Krisztina (Bayreuth DEX) von Massow Gabriele (Bayreuth DEX) Alt Helmut G. (Bayreuth DEX) Welch M. Bruce (Bartlesville OK), Cyclopentadienyl-type ligands, metallocenes, catalyst systems, preparation, and use.
McDaniel Max P. (Bartlesville OK) Klendworth Douglas D. (Westchester OH) Johnson Marvin M. (Bartlesville OK), Fluorided aluminas, catalysts, and polymerization processes.
McDaniel Max P. (Bartlesville OK) Klendworth Douglas D. (Westchester OH) Johnson Marvin M. (Bartlesville OK), Fluorided aluminas, catalysts, and polymerization processes.
Hottovy John D. ; Hensley Harvey D. ; Przelomski David J. ; Cymbaluk Teddy H. ; Franklin ; III Robert K. ; Perez Ethelwoldo P., High solids slurry polymerization.
McDaniel Max P. (Bartlesville OK) Klendworth Douglas (Bartlesville OK) Norwood Donald D. (Bartlesville OK) Hsieh Eric T. (Bartlesville OK) Boggs Elizabeth A. (Bartlesville OK), In situ comonomer generation in olefin polymerization.
McDaniel Max P. (Bartlesville OK) Klendworth Douglas (Bartlesville OK) Norwood Donald D. (Bartlesville OK) Hsieh Eric T. (Bartlesville OK) Boggs Elizabeth A. (Bartlesville OK), In situ comonomer generation in olefin polymerization.
Geerts Rolf L. (Bartlesville OK) Palackal Syriac J. (Bartlesville OK) Pettijohn Ted M. (Bartlesville OK) Infield Robert M. (Barnsdall OK), Metallocene catalyst systems, preparation, and use.
Welch M. Bruce (Bartlesville OK) Alt Helmut G. (Bayreuth DEX) Peifer Bernd (Bayreuth DEX), Metallocene compounds and preparation thereof containing terminal alkynes.
Alt Helmut G. (Bayreuth DEX) Patsidis Konstantinos (Bayreuth OK DEX) Welch M. Bruce (Bartlesville OK) Geerts Rolf L. (Bartlesville OK) Peifer Bernd (Bayreuth OK DEX) Palackal Syriac J. (Bartlesville , Metallocenes and processes therefor and therewith.
Jenkins ; III John M. (So. Charleston WV) Jones Russell L. (Chapel Hill NC) Jones Thomas M. (So. Charleston WV) Beret Samil (Danville CA), Method for fluidized bed polymerization.
Welch M. Bruce (Bartlesville OK) Alt Helmut G. (Bayreuth DEX) Peifer Bernd (Bayreuth OK DEX) Palackal Syriac J. (Bartlesville OK) Glass Gary L. (Dewey OK) Pettijohn Ted M. (Bartlesville OK) Hawley Gi, Method for making and using a supported metallocene catalyst system.
Zenk Roland (Bayreuth DEX) Alt Helmut G. (Bayreuth OK DEX) Welch M. Bruce (Bartlesville OK) Palackal Syriac J. (Bartlesville OK), Method for preparing cyclopentadienyl-type ligands and metallocene compounds.
Mitchell Kent E. (Bartlesville OK) McDaniel Max P. (Bartlesville OK) Welch M. Bruce (Bartlesville OK) Benham Elizabeth A. (Bartlesville OK) Cone Grover W. (Bartlesville OK) ..AP: Phillips Petroleum C, Olefin polymerization.
Stacy Elizabeth M. (Bartlesville OK) Welch M. Bruce (Bartlesville OK) Martin Shirley J. (Bartlesville OK) McDaniel Max P. (Bartlesville OK) Pierce Dale E. (Bartlesville OK), Olefin polymerization.
McDaniels Max P. (Bartlesville OK) Johnson Marvin M. (Bartlesville OK), Olefin polymerization using chromium on an aluminum phosphate produced from a concentrated mass.
Palackal Syriac J. (Bartlesville OK) Alt Helmut G. (Bayreuth DEX) Patsidis Konstantinos (Bayreuth OH DEX) Hill Tara G. (Fairfield OH) Hawley Gil R. (Dewey OK) Chu Peter P. (Bartlesville OK) Welch M. , Olefin polymerization using silyl-bridged metallocenes.
Max P. McDaniel ; Kathy S. Collins ; Anthony P. Eaton ; Elizabeth A. Benham ; Michael D. Jensen ; Joel L. Martin ; Gil R. Hawley, Organometal catalyst compositions.
Max P. McDaniel ; Kathy S. Collins ; James L. Smith ; Elizabeth A. Benham ; Marvin M. Johnson ; Anthony P. Eaton ; Michael D. Jensen ; Joel L. Martin ; Gil R. Hawley, Organometal catalyst compositions.
McDaniel, Max P.; Collins, Kathy S.; Benham, Elizabeth A.; Eaton, Anthony P.; Jensen, Michael D.; Martin, Joel L.; Hawley, Gil R., Organometal catalyst compositions with solid oxide supports treated with fluorine and boron.
McDaniel, Max P.; Collins, Kathy S.; Hawley, Gil R.; Jensen, Michael D.; Benham, Elizabeth A.; Eaton, Anthony P.; Martin, Joel L.; Wittner, Christopher E., Organometal compound catalyst.
McDaniel, Max P.; Collins, Kathy S.; Hawley, Gil R.; Jensen, Michael D.; Wittner, Christopher E.; Benham, Elizabeth A.; Eaton, Anthony P.; Martin, Joel L.; Rohlfing, David C.; Yu, Youlu, Organometal compound catalyst.
Alt Helmut G. (Bayreuth DEX) Palackal Syriac J. (Bartlesville OK) Zenk Roland (Bayreuth DEX) Welch M. Bruce (Bartlesville OK) Schmid Michael (Bayreuth DEX), Organometallic fluorenyl compounds and use thereof in an alpha-olefin polymerization process.
Alt Helmut G. (Bayreuth DEX) Hawley Gil R. (Dewey OK) Smith Paul D. (Seabrook TX) Palackal Syriac J. (Bartlesville OK) Schmid Michael (Bayreuth DEX) Welch M. Bruce (Bartlesville OK) Patsidis Konstant, Organometallic fluorenyl compounds and use thereof in olefin polymerization.
Alt Helmut G. (Bayreuth DEX) Palackal Syriac J. (Bayreuth DEX) Patsidis Konstantinos (Bayreuth OK DEX) Welch M. Bruce (Bartlesville OK) Geerts Rolf L. (Bartlesville OK) Hsieh Eric T. (Bartlesville OK, Organometallic fluorenyl compounds, preparation, and use.
Martin,Joel L.; Thorn,Matthew G.; McDaniel,Max P.; Jensen,Michael D.; Yang,Qing; DesLauriers,Paul J.; Kertok,Mark E., Polymerization catalysts and process for producing bimodal polymers in a single reactor.
McDaniel Max P. (Bartlesville OK) Johnson Marvin M. (Bartlesville OK), Polymerization process using catalysts with acid gelled aluminum phosphate base.
McDaniel, Max P.; Collins, Kathy S.; Smith, James L.; Benham, Elizabeth A.; Johnson, Marvin M.; Eaton, Anthony P.; Jensen, Michael D.; Martin, Joel L.; Hawley, Gil R., Polymerization process utilizing organometal catalyst compositions and the polymer produced thereby.
McDaniel Max P. (Bartlesville OK) Smith Paul D. (Seabrook TX) Norwood Donald D. (Bartlesville OK), Polymerization with surface silicated and fluorided alumina supported chromium.
Hanson Donald O. (Bartlesville OK), Process and apparatus for separating diluents from solid polymers utilizing a two-stage flash and a cyclone separator.
Benham Elizabeth A. (Bartlesville OK) McDaniel Max P. (Bartlesville OK), Process for making bimodal polyolefins using two independent particulate catalysts.
Martin Shirley J. (Bartlesville OK) Benham Elizabeth A. (Bartlesville OK) McDaniel Max P. (Bartlesville OK) Gerhold Bruce W. (Bartlesville OK), Process for olefin polymerization.
Frey Krisztina (Bayreuth DEX) von Massow Gabriele (Bayreuth DEX) Alt Helmut G. (Bayreuth DEX) Welch M. Bruce (Bartlesville OK), Process for preparing cyclopentadienyl-type ligands.
Welch M. Bruce (Bartlesville OK) Geerts Rolf L. (Bartlesville OK) Palackal Syriac J. (Bartlesville OK) Pettijohn Ted M. (Marshall TX), Process for producing broad molecular weight polyolefin.
McDaniel, Max P.; Benham, Elizabeth A.; Martin, Shirley J.; Collins, Kathy S.; Smith, James L.; Hawley, Gil R.; Wittner, Christopher E.; Jensen, Michael D., Process for producing polymers.
Alt Helmut G. (Bayreuth DEX) Patsidis Konstantinos (Bayreuth DEX) Welch M. Bruce (Bartlesville OK) Chu Peter P. (Bartlesville OK), Process of polymerizing olefins using diphenylsilyl or dimethyl tin bridged 1-methyl fluorenyl metallocenes.
McDaniel Max P. (Bartlesville OK) Smith Paul D. (Bartlesville OK) Norwood Donald D. (Bartlesville OK), Silicon and fluorine-treated alumina containing a chromium catalyst and method of producing same.
Knudsen Ronald D. (Bartlesville OK) McDaniel Max P. (Bartlesville OK) Boggs Elizabeth A. (Bartlesville OK) Bailey F. Wallace (Bartlesville OK), Twice-aged porous inorganic oxides, catalysts, and polymerization processes.
Alt Helmut G. (Bayreuth DEX) Palackal Syriac J. (Bartlesville OK) Patsidis Konstantinos (Berlin DEX) Welch M. Bruce (Bartlesville OK) Geerts Rolf L. (Bartlesville OK) Hsieh Eric T. (Bartlesville OK) , Unbridged metallocenes of 9-substituted fluorenyl compounds and use thereof.
Patsidis Konstantinos (Bayreuth DEX) Peifer Bernd (Bayreuth DEX) Palackal Syriac J. (Bartlesville OK) Alt Helmut G. (Bayreuth DEX) Welch M. Bruce (Bartlesville OK) Geerts Rolf L. (Bartlesville OK) Fa, Vinly-substituted bridged metallocenes.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.