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5,412,958 78 furtherpestrepellentmaterials(e.g.,paradichloroben zene, known moth repellent) could be contacted to cleaned fabrics, again, so long as such materials were soluble or dispersible in the dense or supercritical ?uid orgas.Yetfurther,itisknown thatlanolin,anaturaloil from wool, is soluble in dense or supercritical ?uid. So, in a variation of this embodiment, lanolin stripped off from wool fabrics could be distilled or fractionated or ?ltered to remove impurities, such as soils, and at least partially recovered and replaced in such cleaned wool fabrics. platform member 121 resting rotatably on ball bearings 122, and drive disk 123. The platform and drive disk are rotationally coupled by magnets 124 which are ar ranged, in suitable number, symmetrically around the circumferenceofeach.The drivediskiscoupledtothe motor by belt 125 and pulley 126 or other appropriate means. When the basket is magnetically coupled to a motor, the basket can advantageously be sealed from the external environment with no loss of sealing integ rity since drive shafts and other drive means which penetrate the basket are obviated. Thus, by using a magnetic coupling, drive shafts and associated sealing gaskets and the like can be avoided. Further, if the basket is magnetically coupled, the basket can advanta geously be easily removed from and replaced in the chamber. In this manner, the basket can be a component unitand,ifdesired,differentloadsoffabricswithdiffer ent laundering requirements can be batched into differ ent baskets and thus loaded individually into the cham Inthepreferredpractice,thesubstrateorarticletobe cleaned, such as fabrics, would be placed into the cham ber as explained further below. While the fabrics are being cleaned with liquid CO2, the means for imparting aesthetic or commercially enhancing material soluble or dispersibleinthedenseorsupercritical?uid,e.g.,essen tial oils, can be loaded into scalable container 205. After sealingsaidcontainer205,more liquidCO2 canbeintro ducedbyinlettube105Aandtheessentialoilsinthe20 beroneafteranotherforeaseofcleaning.Thecleaning means for imparting aesthetic or commercially enhanc ing material can be extracted, as known in the art (See, egs., Fremont, US. Pat. No. 4,308,200, and Katz, US. Pat. No. 4,820,537, both of which are incorporated hereinbyreferencethereto).Thereafter,thedissolved25 num.ThecleaningvesselasshowninFIG.2canbe oils can be introduced into main chamber 100, either used as the autoclave 10 in the system as shown in FIG. duringthecleaningcycleorbefore,afterorduringthe 1. purge cycle with compressed gas. The use of such means will obviously have aesthetic and commercial value. Further, although means for imparting aesthetic 'or commercially enhancing material to the substrate or article has been described herein as being in-line with the liquid CO2 inlet port, in fact, itmay be possible to positioncontainer205in-linewiththegaseousCO2inlet port101,orelsewherein?uidcommunicationwiththe 35 chamber 100. This latter mode may be advantageously practiced when, as described above, after liquid CO2 has been used to clean fabrics, and then is displaced by compressed gas, the CO2 isin gaseous phase and being recovered and recycled. While this “spent” CO2 is being “pumped down,” the container with the aesthetic or commercially enhancing material could be solubi lized in liquid CO2 and allowed to descend from inlet port 101 and contact the cleaned fabrics. Turning back to the description of the remaining 45 components of FIG. 2, inside the chamber 100 isbasket or drum 110 that issupported by two sets of rollers 111 and 1110. The basket has perforations 130 so that gase ous and liquid CO2 can readily enter and exitthe basket. Vanes 112 creates a tumbling action when the drum is spun. Substrates to be cleaned are placed into the basket through an opening in the chamber which is sealed by hinged door 113 when the cleaning vessel is in use. Situated along the perimeter of outer chamber are coils 114 through which coolant or heating ?uid can be cir culated. The drum in basket 110 is advantageous at exposing greater surface area of fabric substrates to the dense ?uid and may also contribute to some mechanical partitioning of soil from fabric. Also, in case there is an interfaceordensitygradientestablishedinthechamber, rotation of the drum can “cycle” the fabrics causing partitioning of soils from fabrics. Additionally, the dense gas can advantageously be separated or driven off fromthefabricbytherotationalactionofthedrum. It is to be understood that while the invention has been described above in conjunction with preferred speci?cembodiments,thedescriptionandexamplesare intended to illustrate and not limit the scope of the invention, which is defined by the scope of the ap pended claims. Itisclaimed: 1.An apparatusforcleaningasubstratewithadensi ?ed gas comprising: a scalable cleaning vessel defining a compartment with temperature change means operatively associ atedtherewithforadjustingthetemperaturewithin saidcompartment; a rotatable drum adapted to receive the substrate, the drum being positionable inside the cleaning vessel compartment, the substrate being selectably in contact with a densi?ed ?rst gas when within the compartment; astoragevesselin?uid communication withthecom partment; a gas vaporizer vessel in ?uid communication with the compartment, wherein the storage vessel isin ?uid communication with the gas vaporizer vessel by ?rst conduit means; a container containing means for imparting an aes thetic or commercially enhancing material soluble or dispersible in said densi?ed first gas in ?uid communication with the compartment; and means for introducing a compressed second gas at a selected pressure into said compartment for dis placing said ?rst densi?ed gas. 2. The cleaning apparatus as de?ned in claim 1 wherein said container containing said means for im parting an aesthetic or commercially enhancing mate rialisintroducedintosaidcompartmentwithsaiddensi fled ?rst gas. 3. The cleaning apparatus as defined in claim 1 Thebasketismagneticallycoupledtoanmotor120,65 whereinsaidmeansforimpartinganaestheticorcom which is preferably electric, so that the basket can be merciallyenhancingmaterialfurthercomprisesvegeta rotated. Other motive means for driving the basket are tive matter containing essential oils. possible. Speci?cally, the inner basket is attached to a vessel is generally made from materials which are chemically compatible with the dense ?uids used and sufficiently strong to withstand the pressures necessary to carry out the process, such as stainless steel or alumi *****PDF Image | LIQUID SUPERCRITICAL CARBON DIOXIDE DRY CLEANING SYSTEM
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