Pressure management for slurry polymerization
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-002/00
C08F-110/02
C08F-002/01
B01J-019/18
C08F-002/14
C08F-006/00
C08J-011/02
출원번호
US-0962228
(2015-12-08)
등록번호
US-9469707
(2016-10-18)
발명자
/ 주소
Kufeld, Scott E.
Kreischer, Bruce E.
Hottovy, John D.
출원인 / 주소
Chevron Philips Chemical Company LP
대리인 / 주소
Conley Rose, P.C.
인용정보
피인용 횟수 :
1인용 특허 :
43
초록▼
Processes and systems for the production for pressure management of a polymerization product flowing from a loop polymerization reactor to a separation vessel in a slurry polymerization system are disclosed herein. For example, a process comprises withdrawing a polymerization product slurry from a l
Processes and systems for the production for pressure management of a polymerization product flowing from a loop polymerization reactor to a separation vessel in a slurry polymerization system are disclosed herein. For example, a process comprises withdrawing a polymerization product slurry from a loop polymerization reactor, conveying the polymerization product slurry through a first line comprising a continuous take-off valve to yield a mixture comprising a vapor phase, wherein the mixture exits the continuous take-off valve, and conveying the mixture through a second line comprising a flashline heater so that the mixture has a Froude number in a range from about 5 to about 100.
대표청구항▼
1. A process for pressure management of a polymerization product in slurry polymerization, the process comprising: withdrawing a polymerization product slurry from a loop polymerization reactor;conveying the polymerization product slurry through a first line comprising a continuous take-off valve, t
1. A process for pressure management of a polymerization product in slurry polymerization, the process comprising: withdrawing a polymerization product slurry from a loop polymerization reactor;conveying the polymerization product slurry through a first line comprising a continuous take-off valve, to yield a mixture comprising a vapor phase, wherein the mixture exits the continuous take-off valve and wherein the vapor phase of the mixture comprises greater than 0.0000% by weight of the mixture exiting the continuous take-off valve; andconveying the mixture through a second line comprising a flashline heater so that the mixture has a Froude number in a range from about 5 to about 100. 2. The process of claim 1, wherein the Froude number is defined as: Fr=V/(D*g)0.5 where V is an average velocity (units of ft/s) of the mixture in the flashline heater, g is the gravitational constant (322 ft/s2), and D is an internal pipe diameter (units of ft) of the flashline heater. 3. The process of claim 1, wherein the Froude number of the mixture conveyed through the flashline heater is in a range of about 10 to about 60. 4. The process of claim 1, wherein a drop in pressure of the first line is less than a drop in pressure of the second line. 5. The process of claim 1, wherein the vapor phase of the mixture comprises greater than 1% by weight of the mixture exiting the continuous take-off valve. 6. The process of claim 1, wherein the vapor phase of the mixture comprises greater than 2% by weight of the mixture exiting the continuous take-off valve. 7. The process of claim 1, wherein the vapor phase of the mixture comprises greater than 3% by weight of the mixture exiting the continuous take-off valve. 8. The process of claim 1, wherein the vapor phase of the mixture comprises greater than 5% by weight of the mixture exiting the continuous take-off valve. 9. The process of claim 1, wherein the polymerization product slurry comprises a solid polymer and a liquid phase of a diluent, wherein the mixture further comprises the solid polymer, wherein the vapor phase of the mixture comprises at least a portion of the diluent. 10. A process for pressure management of a polymerization product slurry withdrawn from a loop polymerization reactor in slurry polymerization, the process comprising: conveying the polymerization product slurry through a continuous take-off valve;converting the polymerization product slurry to a mixture comprising a vapor phase, wherein the mixture exits the continuous take-off valve and wherein the vapor phase of the mixture comprises greater than 0.0000% by weight of the mixture exiting the continuous take-off valve; andconveying the mixture through a flashline heater, wherein the mixture conveyed through the flashline heater has a Froude number in a range of 5 to 100. 11. The process of claim 10, wherein the Froude number is defined as: Fr=V/(D*g)0.5 where V is an average velocity (units of ft/s) of the mixture in the flashline heater, g is the gravitational constant (32.2 ft/s2), and D is an internal pipe diameter (units of ft) of the flashline heater. 12. The process of claim 10, wherein the mixture conveyed through the flashline heater has a Froude number in a range of 10 to 60. 13. The process of claim 10, wherein a drop in pressure of a first line comprising the continuous take-off valve is less than a drop in pressure of a second line comprising the flashline heater. 14. The process of claim 10, wherein the polymerization product slurry comprises a solid polymer and a liquid phase of a diluent, wherein the mixture further comprises the solid polymer, and wherein the vapor phase of the mixture comprises at least a portion of the diluent. 15. The process of claim 14, wherein the solid polymer comprises polyethylene, wherein the diluent comprises isobutane. 16. The process of claim 10, wherein the vapor phase of the mixture comprises greater than 1% by weight of the mixture exiting the continuous take-off valve. 17. The process of claim 10, wherein the vapor phase of the mixture comprises greater than 3% by weight of the mixture exiting the continuous take-off valve. 18. The process of claim 10, wherein the vapor phase of the mixture comprises greater than 5% by weight of the mixture exiting the continuous take-off valve. 19. The process of claim 1, wherein the vapor phase of the mixture comprises greater than 5% by weight of the mixture exiting the continuous take-off valve. 20. The process of claim 9, wherein the solid polymer comprises polyethylene, wherein the diluent comprises isobutane.
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