Supercritical Fluids Environment The process can be designed to be closed loop; after cleaning, the CO2 is removed from the pressure vessel and the temperature and pressure are reduced. This causes the soils to drop out in a holding tank. The CO2 gas is then recycled back to the pressure vessel. The CO2 gas used is a byproduct of other processes, so the supercritical cleaning process is not a new generator of CO2. This process does not increase the level of CO2 emissions that are a growing concern in global warming. Indeed, shifting from organic solvent use may decrease the total CO2 output. State Information | Glossary | Conversion Checklist | Comments Home | Process Advisor | Alternatives | Links | Search All SAGE material, Copyright© 1992, Research Triangle Institute Last Update: 18 March 1995 sage@rti.org http://clean.rti.org/alt.cfm?id=sc&cat=en