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US 8,128,735B1 34 sequestrationandstorageoperations,thedilutedstreammust undergo further separation for removal of the regeneration gas, and further ine?iciencies result. It Would be advanta geoustoprovideasWing-adsorptionprocessforCO2 separa tion using Zeolites Where sorbent regeneration could occur in an atmosphere ofCO2. The use ofCO2 as sWeep gas during regenerationWouldresultinthegenerationofapurestreamof the gas Without the need for further gas separations. Accordingly, it is an object of this disclosure to provide a methodofCO2 separationutiliZingZeoliteadsorbentsina manner that preserves adsorption capacities at higher tem peratures, such that parasitic external refrigeration loads are reduced or eliminated. Further, it is an object of this disclosure to provide a methodofCO2 separationutiliZingZeoliteadsorbentsthat takes advantage of the propensity for increased adsorption under increased CO2 partial pressure and alloWs for higher pressureregeneration,suchthatahigherpressureCO2 prod uctstreamisproducedandcompressionburdensWhichmight 20 exist in sequestration and storage operations are reduced or eliminated. Further, it is an object of this disclosure to provide a methodofCO2 separationutiliZingZeoliteadsorbentsina TSAprocessWheresorbentregenerationoccursinanatmo 25 sphereofCO2, suchthatapurestreamoftheCO2 isgenerated Without the need for further gas separations. These and other objects, aspects, and advantages of the presentdisclosureWillbecome betterunderstoodWithrefer ence to the accompanying description and claims. 30 SUMMARY OF INVENTION ThedisclosureprovidesamethodforseparatingCO2 from agasstreamcomprisedofCO2 andothergaseousconstituents 35 using a Zeolite sorbent in a sWing-adsorption process that producesarelativelypureCO2 streamduringZeolitesorbent regeneration,suchthatfurthergaseousseparationoperations are eliminated. Additionally, the method alloWs for CO2 adsorptionathighertemperaturesandhigherpressures,40 reducing the energy loss associated With cooling gaseous streams When separation precedes combustion of a non-ad sorbedcomponent.Further,themethodalloWsforCO2 des orptioninaCO2 atmosphere,producingahighpurity,high pressure CO2 stream and reducing compression burdens 45 Which might existinsequestrationand storageoperations. ThemethodeffectivelylendsitselftoaCO2 separationcycle Whereby necessary heat transfers Within the cycle are effec tivelyintegratedsuchthatoverallef?ciencyisoptimiZed,and H20adsorptiondoesnotprecludeeffectiveoperationofthe50 sorbent. TheregenerationoftheCO2 loadedZeolitesorbentina CO2 atmosphere is a novel aspect of the method disclosed herein.Adsorptionoccursundera?rsttemperatureanda?rst CO2pressurecondition,Wherethe?rstCO2pressureisgen 55 erally the partial pressure of CO2 in an input gas stream comprisedofCO2,H20,andothergaseousconstituents.Des orptionisprovokedbyheatingtheloadedZeolitesorbentina CO2atmosphereofatleast90Wt% CO2,sothatregeneration occursatahigher,secondCO2 pressure,andaproductCO2 60 streamofhighpurityandhighCO2 pressureresults.Ina particularembodiment,themethodincorporatescyclic operation of the sorbent betWeen a capture reactor and a regeneration reactor in a thermally integrated manner for optimiZede?iciency.Inafurtherembodiment,thecycleis65 incorporatedinanIGCC foref?cientpre-combustionCO2 capture. The method generally comprises: generating an input gas streamcomprisedofCO2 andothergaseousconstituentsata ?rst CO2 pressure; contacting the input gas stream With a Zeolitesorbentata?rsttemperatureandthe?rstCO2 pres sure,andtransferringexothermicheat;regeneratingtheZeo litesorbentatahigher,secondtemperatureinaCO2 atmo spherecomprisedofatleast90mol% CO2toattainasecond, higher CO2 pressure, and providing endothermic heat, and; generatingtheoutputgasstreamcomprisedofdesorbedCO2 andsomeportionoftheCO2 atmosphere,inordertoproduce ahighpurityoutputgasstreamhavingahigherCO2 pressure than the input gas stream. In a particular embodiment, the CO2 atmosphereismaintainedbyaregenerationstreamcom prised of some portion of the output gas stream. In another embodiment, the input gas stream is further comprised of H20 andthesecondtemperatureprovidesfordehydration priortomoistureremoval,producingadry?nalCO2 stream. A particularapplicationutiliZesaninputgasstreamofshifted syngas at a temperature exceeding 200° C., capture at approximately150°C.,andregenerationatapproximately 350° C. in order to produce a ?nal CO2 stream having loW moisture, loW temperature, and high CO2 pressure, greatly reducing any compression energy requirements Which may besubsequentlyrequired. ThevariousfeaturesofnoveltyWhichcharacterizethis disclosure are pointed out With particularity in the claims annexed to and forming a part of this disclosure. For a better understandingoftheinvention,itsoperatingadvantagesand speci?c objects attained by its uses, reference is made to the accompanying draWings and descriptive matter in Which a preferredembodiment ofthedisclosureisillustrated. BRIEF DESCRIPTION OF THE DRAWINGS FIG.1AillustratesCO2 separationforaninputgasstream comprisedofCO2 andothergaseousconstituentsutiliZinga Zeolitesorbent. FIG. 1B illustrates the generation of a CO2 stream by regeneratingtheZeolitesorbentinahighCO2 pressureenvi ronment. FIG. 2 illustrates a cyclic process using a capture reactor and a regeneration reactor With Zeolite sorbent transfer in a thermallyintegratedcycle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS ThefolloWingdescriptionisprovidedtoenableanyperson skilled in the art to use the invention and sets forth the best modecontemplatedbytheinventorforcarryingouttheinven tion. Various modi?cations, hoWever, Will remain readily apparenttothoseskilledintheart,sincetheprinciplesofthe present invention are de?ned herein speci?cally to provide a method of separating CO2 from a process gas stream com prisedofCO2andothergaseousconstituentsinanadsorp tion/desorption cycle using a Zeolite sorbent, Where the des orption cycle is conducted under conditions of increased temperature and increased CO2 pressure to produce a high pressure output gas stream. The disclosure herein provides a method for separating CO2 fromagasstreamcomprisedofCO2 andothergaseous constituentsusingaZeolitesorbentinasWing-adsorption processthatproducesarelativelypureCO2 streamduring Zeolite sorbent regeneration, such that further gaseous sepa rationoperationsareeliminated.Additionally,themethod alloWsforCO2adsorptionathighertemperaturesandhigher pressures, reducing the energy loss associated With coolingPDF Image | PROCESS FOR CO2 CAPTURE USING ZEOLITES
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