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(12)United States Patent Siriwardane et a]. (54) PROCESSFORCO2CAPTUREUSING ZEOLITES FROM HIGH PRESSURE AND MODERATE TEMPERATURE GAS STREAMS (75) Inventors: RanjaniV.Siriwardane,MorgantoWn, WV(Us);RobertW-stevens, Siriwardaneetal,“AdsorptionofCO2,N2,and02onnatural MOrgantOWn,WV (US) (73) Assignee: TheUnitedStatesofAmericaas represented by the United states Zeolites,”Energy&Fuels,vol.17(2003). Siriwardaneetal,“AdsorptionofCO2 onZeolitesatModerateTem peratures,”Energy&Fuels,V01~19(2005) Bonenfant et al, “Advances in principal factors in?uencing carbon dioxideadsorptiononZeolites,”Sci.Technol.Adv.Mater.9(2008). *citedbyexaminer PrimaryExamineri FrankLawrence,Jr, (74) Attorney, Agent, or Firm * James B. Potts; Mark P. Dvorscak; John T. Lucas (57) ABSTRACT AmethodforseparatingCO2fromagasstreamcomprisedof CO2 andothergaseousconstituentsusingaZeolitesorbentin a swing-adsorption process, producing a high temperature CO2 stream at a higher CO2 pressure than the input gas StreamThemethodutilizesCO2(195011990111119CO2arm Sphere and effectively integrates heat transfers for Optimizes overallef?ciency.H2O adsorptiondoesnotprecludeeffective operationofthesorbent.Thecyclemaybeincorporatedinan IGCC foref?cientpre-combustionCO2 capture.A particular application operates on shifted syngas at a temperature exceeding 2000 C. and produces a dry CO2 stream at loW temperatureandhighCO2 pressure,greatlyreducingany compression energy requirements Which may be subse quentlyrequired. (*) Notice: DepartmentofEnergy Washington DC (US) Subject'toanydisclaimer,~thetermofthis Patent 15 extended or adlusted under 35 U-S~C~ 154(1)) by 398 days- (21) Appl.No.:12/582,760 (22) Filed; 0et_21,2009 (51) Int_C]_ B01D 53/04 (200601) (52) us.Cl. .. .95/115;95/139 (58) FieldofClassi?cationSearch ..95/107 (56) 95/114 115 117 139 148 902. 423/236 Seeapplication?leforeomp’letegearcilhist’ory~ References Cited U.S.PATENT DOCUMENTS 3,594,983 A * 7/1971 Yearout ............................ 95/97 4,770,676 A * 9/1988 Sircar et a1. .. 5,846,295 A * 12/1998 Kalbassieta1. ...............95/105 5,855,650 A 1/1999 Kalbassietal. 20Claims,2DrawingSheets 220 213 201 Q4 202 217 212 210 US008128735B1 (10)PatentN0.: US 8,128,735B1 (45) Date of Patent: Mar. 6, 2012 $2* liI’liflget,lift81 95M a ette et . ....................... , , 8,025,720 B2* 9/2011 Barclayetal. .96/115 2003/0126989 A1* 7/2003 Banconetal. ..95/96 OTHERPUBLICATIONSPDF Image | PROCESS FOR CO2 CAPTURE USING ZEOLITES
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