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(12)United States Patent Leitch et al. (54) CO2 RECOVERY PROCESS FOR SUPERCRITICAL EXTRACTION (75) Inventors: KellyLeitch,Nampa,ID(US);Gavin Hartigan,Bradford,MA (US);Robert D’Orazio, Livermore, CA (US) (73) Assignee: TheBOC Group,Inc.,MurrayHil, NJ (US) US 6,960,242B2 (*) Notice: Subjecttoanydisclaimer,thetermofthis patent is extended or adjusted under 35 U.S.C.154(b)by173days. 5,028,273 A 5,339,844 A 5,582,029 A 5,775,127 A 5,881,577 A 5,925,326 A 6,082,150 A 6,164,088 A 6,327,872B1 6,361,696 B1 * 6,444,011 B2 * 6,612,317 B2 6,735,978 B1 * 2001/0050096A1 2003/0072690 A1 2003/0161780 A1 * cited by examiner 7/1991 Weltmer,Jr.etal. 8/1994 Standford,Jr.etal. 12/1996 Occhialinietal. 7/1998 Z06 3/1999 Saueretal. 7/1999 Kapooretal. 7/2000 Stucker 12/2000 Moriguchietal. 12/2001 Boydetal. 3/2002 Spiegelman et al. ....... 210/662 9/2002 Li et al. ....................... 95/45 9/2003 Costantinietal. 5/2004 Tom etal. ...................62/606 12/2001Constantinietal. 4/2003 Royeretal. 8/2003 Howard etal. (21) Appl.No.:10/671,163 (22) (65) (60) (51) (52) (58) (56) Filed: Sep.25,2003 Prior Publication Data US 2004/0118281 A1 Jun. 24, 2004 Related US. Application Data ProvisionalapplicationNo.60/415,655,?ledonOct.2, 2002. Int.Cl.7..B01D53/02;B01D53/26; B01D 53/75 US.Cl...95/90;96/134;55/315.1; 62/606; 62/502; 62/928 FieldofSearch..95/90,117,148, 95/273; 96/108, 121, 134, 143; 55/315.1; 134/1.3; 423/437.1; 62/606, 50.2, 928 References Cited U.S. PATENT DOCUMENTS Primary Examiner—Frank M. LaWrence (74) Attorney, Agent, or Firm—Joshua L. Cohen (57) ABSTRACT A carbondioxiderecoveryapparatusandprocessforsuper critical extraction includes providing a process stream from a supercritical extraction procedure in Which the process stream includes pressurized carbon dioxide, extraction pro cess Waste and optionally at least one co-solvent; reducing the pressure of the process stream beloW critical pressure; venting loW pressure carbon dioxide vapor to exhaust; cooling the process stream to form a tWo phase mixture; separating the tWo phase mixture into a process liquid, containing co-solvent ifpresent, and a process vapor phase stream; collecting the process liquid; ?ltering the process vapor phase stream to remove particulates and optionally residualco-solvent;passingthe?lteredprocessvaporstream through an adsorber to remove trace impurities to form a puri?ed carbon dioxide vapor stream; and, drying the puri ?ed carbon dioxide vapor stream to remove residual Water vapor. 16Claims,1DrawingSheet 3,420,633 A 4,337,071 A 4,349,415 A 4,717,406 A 4,806,171 A 1/1969 Lee 6/1982 Yang 9/1982 DeFilippietal. 1/1988 Giacobbe 2/1989 Whitlocketal. 22 US006960242B2 (10)Patent N0.: (45) Date of Patent: NOV. 1,2005PDF Image | CO2 RECOVERY PROCESS FOR SUPERCRITICAL EXTRACTION
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