Extraction of Volatile Compounds from Aqueous Solution using Micro Bubble, Gaseous, Supercritical and Liquid Carbon Dioxide

When separating volatile compounds from aqueous solution using supercritical carbon dioxide (SC CO 2 ), methods to bring SC CO 2 into contact with volatile compounds in the solution are very important. An extraction using micro bubble, gaseous, supercritical, and liquid CO 2 generated by a filter nozzle was carried out. Under optimal conditions (20 MPa, 35°C), > 95% of volatile compounds consisting of 6 to 12 carbon atoms could be removed by extraction for 40 min at CO 2 flow rate, 4.0 g/min. Extraction at 35°C could achieve either a selective or nonselective separation by adjusting the extraction pressure, since the effect of pressure on extraction ratio was most significant at 35°C.