[특허]Continuous take off technique and pressure control of polymerization reactors

Chevron Phillips Chemical Company LP

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Continuous take off technique and pressure control of polymerization reactors

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08F-002/00 C08F-210/00 C08F-110/02 F01N-003/20 B01J-019/00 B01J-019/18
미국특허분류(USC)	526/064; 526/348; 526/352; 422/131; 422/105; 422/132
출원번호	US-0687170 (2012-11-28)
등록번호	US-8816024 (2014-08-26)
발명자 / 주소	Hottovy, John D.
출원인 / 주소	Chevron Phillips Chemical Company LP
대리인 / 주소	Fletcher Yoder, P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 45

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A polymerization reactor system includes features for operating two or more reactors in series or parallel. The system includes a discharge line coupled to an outlet of a first polymerization reactor, a first conduit connecting the first polymerization reactor to a second polymerization reactor via the discharge line, a second conduit connecting the first polymerization reactor to a flashline apparatus via the discharge line, and a diverter valve coupling the first and second conduits to the discharge line. The diverter valve is configured to selectively open the discharge line to the first conduit and close the discharge line to the second conduit in a first valve state and to selectively open the discharge line to the second conduit and close the discharge line to the first conduit in a second valve state. The diverter valve is capable of switching between the first and second valve states.

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1. A polymerization reactor system, comprising: a discharge line coupled to an outlet of a first polymerization reactor;a first conduit connecting the first polymerization reactor to a second polymerization reactor via the discharge line;a second conduit connecting the first polymerization reactor to a flashline apparatus via the discharge line;a diluent supply path that diverges into a first flush path and a second flush path, wherein the first flush path is configured to controllably flow a diluent into the discharge line and wherein the second flush path is configured to controllably flow the diluent into the first conduit;a withdrawal conduit disposed along the first conduit and comprising a drain valve, wherein the withdrawal conduit and the drain valve are arranged such that when the drain valve is in an open state, contents of the first conduit are able to be flushed into the withdrawal conduit using the diluent from at least the second flush path; anda diverter valve coupling the first and second conduits to the discharge line, wherein the diverter valve is configured to selectively open the discharge line to the first conduit and close the discharge line to the second conduit in a first valve state, and is configured to selectively open the discharge line to the second conduit and close the discharge line to the first conduit in a second valve state, wherein the diverter valve is capable of switching between the first and second valve states. 2. The system of claim 1, wherein the first valve state is configured to place the first and second polymerization reactors in a series configuration. 3. The system of claim 1, wherein the second valve state is configured to enable one or both of the first and second polymerization reactors to operate independently. 4. The system of claim 1, wherein the discharge line of the first polymerization reactor comprises a continuous take-off device configured to continuously discharge a first slurry comprising particles of a first polymer in the diluent. 5. The system of claim 4, wherein the second conduit connecting the first polymerization reactor to the flashline apparatus via the discharge line is configured to flow the first slurry to the flashline apparatus. 6. The system of claim 5, comprising an additional continuous take-off device coupled to the second polymerization reactor and configured to continuously discharge a second slurry comprising particles of a second polymer in the diluent; and a third conduit fluidly coupling the additional continuous take-off device to the flashline apparatus via an additional diverter valve, and the additional diverter valve is configured to selectively enable only one of the first slurry or the second slurry to flow to the flashline apparatus. 7. The system of claim 5, comprising an additional continuous take-off device coupled to the second polymerization reactor and configured to continuously discharge a second slurry comprising particles of a second polymer in the diluent; and a third conduit fluidly coupling the additional continuous take-off device to an additional flashline apparatus. 8. The system of claim 7, comprising a plurality of conduits fluidly coupled to respective outlets of the second polymerization reactor, and each conduit of the plurality of conduits is configured to continuously discharge the second slurry, and the plurality of conduits lead to the flashline apparatus, the additional flashline apparatus, or a combination thereof. 9. A polymerization reactor system, comprising: a first polymerization reactor configured to receive a feed comprising a diluent and a first monomer from a reactor feed system, and configured to polymerize the first monomer to produce a first polymer in a first slurry;a transfer line coupled to the first polymerization reactor and configured to flow a transfer slurry comprising the first polymer and the diluent continuously from the first polymerization reactor;a second polymerization reactor configured to receive the transfer slurry from the transfer line and to polymerize a second monomer to form a second polymer in a second slurry;one or more continuous take-off devices disposed on the second polymerization reactor and configured to discharge a discharge slurry comprising the second polymer and the diluent continuously from the second polymerization reactor such that a pressure in the first polymerization reactor and a pressure in the second polymerization reactor are modulated using only continuous take-off of the discharge slurry from the second polymerization reactor along with the feed into the first polymerization reactor. 10. The system of claim 9, wherein during operation, the first polymerization reactor and the transfer line are substantially free of gravity settling. 11. The system of claim 9, comprising a continuous take-off device configured to discharge the transfer slurry from the first polymerization reactor such that the transfer slurry has a higher average solids concentration than the first slurry. 12. The system of claim 9, comprising an inlet valve coupling the transfer line to the second polymerization reactor, wherein the inlet valve consists essentially of a ram valve. 13. The system of claim 9, wherein the first and second monomers are the same. 14. A polymerization reactor system, comprising: a first polymerization reactor;a second polymerization reactor;a transfer conduit configured to flow a transfer slurry comprising particles of a first polymer in a first diluent from the first polymerization reactor to the second polymerization reactor;an inlet valve coupling the transfer conduit to the second polymerization reactor;a withdrawal conduit disposed along the transfer conduit and comprising a drain valve configured to enable the transfer slurry to flow from the transfer conduit through the withdrawal conduit;a first flush conduit disposed along the transfer conduit and comprising a first diluent control valve configured to at least partially control a flow of a second diluent into the transfer conduit;wherein the inlet valve, the drain valve, and the first diluent control valve are configured to coordinate valve states to direct the second diluent through the transfer conduit and into the withdrawal conduit to flush the transfer slurry from the transfer conduit. 15. The system of claim 14, comprising: a discharge conduit coupled to an outlet of the first polymerization reactor and fluidly coupling the first polymerization reactor to the transfer conduit; anda second flush conduit communicatively coupled with the discharge conduit and comprising a second diluent control valve configured to at least partially control a flow of the second diluent into the discharge conduit;wherein the inlet valve, the drain valve, and the first and second diluent control valves are configured to coordinate valve states to direct the second diluent through the discharge and transfer conduits and into the withdrawal conduit to flush the transfer slurry from the discharge and transfer conduits. 16. The system of claim 15, comprising a diluent supply conduit and a diluent supply pump disposed along the diluent supply conduit, wherein the diluent supply conduit diverges into the first flush conduit and the second flush conduit such that the diluent supply pump is capable of motivating the second diluent through the discharge and transfer conduits, and wherein the first and second diluents have identical compositions. 17. The system of claim 15, wherein the discharge line comprises a continuous take-off device configured to continuously discharge the transfer slurry, wherein the continuous take-off device and the inlet valve isolate the discharge and transfer conduits from the first and second polymerization reactors when closed. 18. The system of claim 17, comprising a flow sensor, a pressure sensor, or a combination thereof, disposed along the transfer conduit and configured to enable a control system to monitor a flow rate or a pressure, respectively, of the transfer slurry, and the control system is configured to adjust a flow rate of the transfer slurry through the discharge and transfer conduits in response to flow rate or pressure feedback obtained from the flow and pressure sensors, wherein the control system is configured to isolate the transfer and discharge conduits from the first and second polymerization reactors in response to flow or pressure feedback indicative of a plug in the transfer conduit. 19. The system of claim 15, comprising: an additional transfer conduit configured to flow the transfer slurry from the first polymerization reactor to a flashline apparatus; anda diverter valve configured to selectively open the discharge conduit to the transfer conduit and close the discharge conduit to the additional transfer conduit in a first valve state, and to selectively open the discharge conduit to the additional transfer conduit and close the discharge conduit to the transfer conduit in a second valve state, and the diverter valve is capable of switching between the first and second valve states. 20. The system of claim 14, wherein the inlet valve comprises a ram valve directly coupling the transfer conduit to the second polymerization reactor. 21. The system of claim 1, comprising: one or more continuous take-off devices disposed on the second polymerization reactor, each of the one or more continuous take-off devices being capable of discharging a discharge slurry comprising polymer and the diluent continuously from the second polymerization reactor; anda control system communicatively coupled to the one or more continuous take-off devices, wherein the control system is configured to operate the one or more continuous take-off devices such that a pressure in the first polymerization reactor and a pressure in the second polymerization reactor are modulated using only continuous take-off of the discharge slurry from the second polymerization reactor along with a feed of polymerization components into the first polymerization reactor. 22. The system of claim 9, comprising: a discharge line coupled to the first polymerization reactor via at least one of the one or more continuous take-off devices and coupling the transfer line to the first polymerization reactor;a diluent supply path that diverges into a first flush path and a second flush path, wherein the first flush path is configured to controllably flow the diluent into the discharge line and wherein the second flush path is configured to controllably flow the diluent into the transfer line; anda withdrawal line disposed along the transfer line and comprising a drain valve configured to enable contents of the transfer line to be flushed into the withdrawal line using the diluent from at least the second flush path. 23. A polymerization reactor system, comprising: a first polymerization reactor;a second polymerization reactor;a transfer conduit configured to flow a transfer slurry comprising particles of a first polymer in a first diluent from the first polymerization reactor to the second polymerization reactor;a discharge conduit coupled to an outlet of the first polymerization reactor and fluidly coupling the first polymerization reactor to the transfer conduit;an inlet valve coupling the transfer conduit to the second polymerization reactor;a withdrawal conduit disposed along the transfer conduit and comprising a drain valve configured to enable the transfer slurry to flow from the transfer conduit through the withdrawal conduit;a diluent supply conduit and a diluent supply pump disposed along the diluent supply conduit, wherein the diluent supply conduit diverges into a first flush conduit and a second flush conduit, and the diluent supply pump is capable of motivating the second diluent through the discharge and transfer conduits;wherein the first flush conduit is disposed along the transfer conduit and comprises a first diluent control valve configured to at least partially control a flow of a second diluent into the transfer conduit;wherein the second flush conduit is communicatively coupled with the discharge conduit and comprises a second diluent control valve configured to at least partially control a flow of the second diluent into the discharge conduit, and the first and second diluents have identical compositions; andwherein the inlet valve, the drain valve, and the first and second diluent control valves are configured to coordinate valve states to direct the second diluent through the discharge and transfer conduits and into the withdrawal conduit to flush the transfer slurry from the discharge and transfer conduits.

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Continuous take off technique and pressure control of polymerization reactors

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