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?lteringtheintermediatecarbondioxideliquidstream; pressuriZing the intermediate carbon dioxide liquid stream; forming a supercritical ?uid from the pressurized carbon dioxide liquid stream and delivering the supercritical ?uid and optionally a co-solvent for a supercritical extractionprocedure; obtaining a process stream from the supercritical extrac tion procedure Wherein the process stream includes pressuriZed carbon dioxide, extraction process Waste and optionally at least one co-solvent; reducing the pressure of the process stream beloW critical pressure; ventingloWpressurecarbondioxidevaportoexhaust; 15 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 phasestream; collectingtheprocessliquid; ?ltering the process vapor phase stream to remove par ticulates and optionally residual co-solvent; passing the ?ltered process vapor stream through an adsorbertoremovetraceimpuritiestoformapuri?ed 25 10 10. The apparatus of claim 7, Wherein at least one condenser includes an external refrigeration circuit having a heat exchanger to condense the puri?ed carbon dioxide vapor feed stream through indirect heat exchange With a refrigerantstream. 11. The apparatus of claim 10 Wherein a conduit is provided betWeen the refrigeration circuit and the adsorber to permit used refrigerant to ?ush out at least one adsorber bed When isolated from the apparatus. 12.An apparatusforthesupplyandrecoveryofcarbon dioxide for a supercritical extraction process comprising: a bulk liquid carbon dioxide supply tank for distilling off a feed stream comprising carbon dioxide vapor; at least one purifying ?lter to remove condensable vapors and particulates from the carbon dioxide vapor feed stream; a ?rst condenser for condensing the carbon dioxide vapor feed stream into an intermediate liquid carbon dioxide stream; a loW pressure accumulation vessel for accumulating the intermediate liquid carbon dioxide stream; at least one particle ?lter to remove particulates from the intermediate liquid carbon dioxide stream; means for pressuriZing the intermediate liquid carbon dioxide stream to form a pressuriZed liquid carbon dioxide stream; a high-pressure accumulation vessel for accepting the pressuriZed liquid carbon dioxide stream; asupercriticalextractionapparatusforreceivingthepres suriZed liquid carbon dioxide stream and optionally a co-solvent,forcarryingoutthesupercriticalextraction andprovidingaprocessstreamcomprisingpressurized liquid carbon dioxide, extraction process Waste and optionally the at least one co-solvent; means for reducing the pressure of the liquid carbon dioxide; a vent for passing loW pressure carbon dioxide vapor resulting from the pressure reduction to exhaust; a separator for forming the process stream into tWo phases comprising a process liquid, containing co-solvent if present, and a process vapor phase stream; a container for collecting the process liquid; at least one ?lter to remove particulates and optionally residual co-solvent from the process vapor phase stream; an adsorber to remove trace impurities from the ?ltered process vapor stream to form a puri?ed carbon dioxide vapor stream; at least one dryer to remove residual Water vapor from the puri?ed carbon dioxide vapor stream; a How netWork having conduits connecting the compo nents of the apparatus; theconduitsofsaidHow netWorkincludingavaporvent line from the loW pressure accumulation vessel to the condenser to facilitate introduction of the intermediate liquid carbon dioxide stream into the loW pressure accumulationvessel; the conduits of the How netWork including a connection betWeen the at least one dryer and the at least one purifying ?lter upstream from the ?rst condenser; and, the How netWork having valves associated With said conduits to alloW for isolation of components of the apparatus. 13. The apparatus of claim 12 Wherein the separator is a second condenser for cooling the process stream to form the tWo phases. carbon dioxide vapor stream; dryingthepuri?edcarbondioxidevaporstreamtoremove residual Water vapor; and, optionallysupplementingthedried,puri?edcarbondiox ide vapor stream With additional distilled carbon diox ide vapor. 7.An apparatusfortherecoveryofcarbondioxidefrom a supercritical extraction process producing a process stream comprising pressuriZed liquid carbon dioxide, extraction process Waste and optionally at least one co-solvent, com prising means for reducing the pressure of the liquid carbon dioxide; and a vent for passing loW pressure carbon dioxide vapor resulting from the pressure reduction to exhaust; characteriZed by further comprising: 35 40 a separator for forming the process stream into tWo phases comprising a process liquid, containing co-solvent if present, and a process vapor phase stream; a container for collecting the process liquid; at least one ?lter to remove particulates and optionally 45 residual co-solvent from the process vapor phase stream; an adsorber to remove trace impurities from the ?ltered process vapor stream to form a puri?ed carbon dioxide vapor stream; at least one dryer to remove residual Water vapor from the puri?ed carbon dioxide vapor stream; a How netWork having conduits connecting the compo nents of the apparatus; the conduits of the How netWork including a connection betWeen the at least one dryer and a condenser asso ciated With a supply of carbon dioxide to the extraction process; and, the How netWork having valves associated With said conduits to alloW for isolation of components of the apparatus. 8. The apparatus of claim 7 Wherein the separator is a second condenser for cooling the process stream to form the tWo phases. 9. The apparatus of claim 7, Wherein the adsorber is a plurality of adsorber beds. US 6,960,242B2 10 55PDF Image | CO2 RECOVERY PROCESS FOR SUPERCRITICAL EXTRACTION
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