Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 4/28/2013
Publication Date: 5/1/2013
Citation: Eller, F.J., Teel, J.A. 2013. Cedarwood: cross-over pressure research [abstract]. American Oil Chemists' Society.
Technical Abstract: A series of experiments were conducted to determine the cross-over pressure for cedarwood oil in carbon dioxide. A closed stirrer reactor with an in-line loop connected to the injector of a GC was used to measure the concentration of cedarwood oil in the carbon dioxide. Both neat cedarwood oil as well as cedarwood chips were placed inside the stirrer reactor. All possible combinations of 4 temperatures (i.e., 25, 45, 65, or 85°C) in conjunction with nine pressures (i.e., 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, or 5000 psi) were tested. The solubility of cedarwood oil was determined from the FID counts from the GC analysis. In addition, changes in the composition were also monitored. Although at pressures below ca. 3000 the solubility of cedarwood oil was higher in liquid carbon dioxide than supercritical carbon dioxide and solubility isotherms appeared similar to those for triglycerides in carbon dioxide. However, at higher pressures, the similarity was absent. Instead of the solubility of cedarwood oil increasing exponentially with pressure as seen for triglycerides, the solubility leveled off. There were also significant differences between the measured solubility when the reactor was filled with neat cedarwood oil and when it was filled with chips.