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11 and this liquid is separated from the gas in the Re?ux Accumulator 416, the liquid leaving the Re?ux Accu mulator 416 via a stream 459. The liquid in stream 459 is pumped by a Re?ux Pump 418 to the CO2-Splitter 412 via a stream 457. The uncondensed carbon dioxide, ethane, and methane-and-lighter gases of stream 415 exit the Re?ux Accumulator 416 via stream 417. 12 isvaporized.ThevaporisreturnedtotheNGL Tower 419 via a stream 434. The unvaporized liquid exits in stream 437 and issubsequently cooled by an Air Cooler 438 to a temperature of 120° F. or less. The cooled liquid from the Air Cooler 438 exits the system as the propane-and-heavier product via stream 439. Stream 433 is fed to the COZ/Light Ends Separator Tower 495 to separate the ethane, lighter components and part of the carbon dioxide vapor (15 to 20 volume to heat the process stream 492 prior to feeding it to an NGLTower419viaastream493whichexitsex changer 403 as discussed above, and to recover the refrigerant energy of stream 492 by chilling the feed stream 402. The cross-exchange of energy occurs as the streams 402 and 492 ?ow through Exchanger 403. pane or freon or other suitable refrigerant (not shown in detail), to a temperature of - 10° to 20° F. The partially condensed ?uid from the Re?ux Condenser 441 isfed to a Re?ux Accumulator 443 via a stream 442. The vapor is separated from the liquid in the Re?ux Accumulator 443. The liquid re?ux ?ows from the Re?ux Accumula tor 443 via a stream 494 to a Re?ux Pump 445 and subsequently ispumped to the COg/Light Ends Separa tor Tower 495 via a stream 446. The vapor from the Re?ux Accumulator 443 exits in a stream 444. 4,861,360 The bottom stream 491 from CO2-Splitter 412 is heatedusingheatfromthecompressedmixtureofgasin astream430,inaCOz-SplitterReboiler490.Thepur 0 percent)fromthemajorpartorremainingcarbondiox pose of Reboiler 490 is to chill the compressed gas mix ture in stream 430 and recover the refrigerant energy from the process stream 491 which is at a temperature of 10° to 25° F. Accordingly the compressed mixture of gasinstream430iscross-exchangedintheCog-Splitter Reboiler 490 with the process stream 491 from the CO2 Splitter412.Theheatpartiallyvaporizesthe?uidin Theliquidinstream449isheatedtoatemperatureof stream491.The vaporisreturnedtotheCOZ-Splitter 412 via a stream 489. The resulting liquid from ex changer 490, free of methane-and-lighter components present in stream 491 and containing some carbon diox ide, ethane, most of the propane and all of the butane and heavier hydrocarbons, exits the COZ-SpIitter Re boiler 490 via a stream 492. The ?uid in stream 492 is cross-exchangedinexchanger403withtheincoming25 denser441wherethestreamisrefrigeratedwithpro feed gas in stream 402. The purpose of this exchange is Stream493isfedtotheNGLTower419,which Tower 419 separates the carbon dioxide and ethane from the propane-and-heavier hydrocarbons in stream 35 493.TheoverheadgasfromtheNGL Tower419isfed viastream420toanNGL TowerRe?uxCondenser421 where the stream 420 is refrigerated with propane or freon or other suitable refrigerant (not shown in detail), totemperaturesof0°to20°F.Thepartiallycondensed 40 streams form a stream 452 which feeds an Absorber ?uidfromtheRe?ux Condenser421isfedtoanNGL Re?ux Accumulator 423 via an exit stream 422 from condenser 421. The liquid re?ux ?ows from the Re?ux Chiller 453. Stream 452 ischilled in the Absorber Feed Chiller 453 to temperatures of l0° to -35° F. by pro pane or freon or other suitable refrigerant (not shown in detail). The carbon dioxide and a small part of the eth Accumulator423viaastream427toanNGLRe?ux 'Pump425andsubsequentlyispumpedtotheNGL 45 anearecondensedanddissolvedinthemethanoland Tower 419 via a stream 426. The vapor from the Re?ux Accumulator 423 exits in the contents of stream 452 exits the Absorber Feed Chiller 453 in a feed stream 454. Stream 454 is fed to the bottom of the Methanol Absorber 496. The vapor and liquid are separated in the bottom of the Methanol Ab~ sorber 496. The uncondensed methane, carbon dioxide and ethane gas ?ow up the absorber countercurrent to the downcoming “lean” methanol ?owing down in Methanol Absorber 496. The “lean” methanol means methanol that has been essentially stripped free of eth a stream 424 and is combined with the vapor in stream 417 to form the feed stream 428 to the inlet of a Com pressor 429. The vapor from stream 428 is compressed to a pressure of 600 to 650 psia and subsequently ?ows via outlet stream 430 from Compressor 429 to the CO2 Splitter Reboiler 490 to provide heat to the Reboiler 490 and to recover the cryogenic energy in stream 430, lowering the vapor temperature from 50° F. to 25° F. 55 ane. carbon dioxide and other hydrocarbons. The The chilledvaporexitsreboiler490instream431andis further refrigerated by the Chiller 432 with propane or freon or other suitable refrigerant (not shown in detail) to temperatures of --10° F. to 20° F. and fed to a CO2/ Light Ends Separator Tower 495 via outlet stream 433 from chiller 432. “lean” methanol feeds the top of the Methanol Ab sorber496froma-stream481attemperaturesof— 35°to 10° F. The methanol rate is adjusted on the basis of absorbing the carbon dioxide and rejecting the ethane methane—and-lightercomponents.Thisisapproximately between two and three to one molal ratio of methanol to carbon dioxide. The Methanol Absorber 496 isoperated atpressuresof500to650psia.The ethane-methane-and lighter component such as nitrogen exit the top of the TheliquidbottomsexittheNGLTower419ina stream436and?ow toanNGL TowerReboiler435. HeatisprovidedtotheNGL TowerReboiler435by steamorothersuitablemedia(notshownindetail)or65 MethanolAbsorber496inastream456attemperatures some other suitable heat medium. The liquid in stream 436isheatedintheNGLTowerReboiler435toa temperature of 150° to 220° F. where part of the liquid of 3° to 5° F. above the temperature of the “lean” meth anol in stream 481. Stream 456 cross-exchanges with a feed gas in Exchanger 405 and exits to the pipeline (not ide bottoms (80 to 85 volume percent). The liquid bottoms exit the COZ/Light Ends Separa tor Tower 495 in stream 449 to a Reboiler 448. Heat is provided to the Reboiler 448 by subcooling refrigerant such as propane or freon or other suitable refrigerant (not shown in detail) or some other suitable refrigerant. 30°to50°F.wherepartoftheliquidisvaporized.The vapor returns to the COZ/Light Ends Separator Tower 495 via a stream 447. The unvaporized liquid exits Re boiler 448 in stream 450 as part of the carbon dioxide liquidproduct. The overhead gas from the COZ/Light Ends Separa tor Tower 495 in stream 440 is fed to a Re?ux Con Stream 444 is combined with liquid from a side stream 451 which is taken from, for example, chimney tray 496 of a Methanol Absorber 455. The combinedPDF Image | CARBON DIOXIDE ABSORPTION METHANOL PROCESS
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