title: Supercritical fluid chromatographic analysis for on-line monitoring of hexane removal from soybean oil miscella using liquid carbon dioxide.
abstract: Liquid carbon dioxide (L-CO2) can be used to separate hexane from hexane/soybean oil (SBO) mixtures (i.e., miscella). An on-line supercritical fluid chromatographic (SFC) method was developed to monitor this separation. L-CO2 (25 degrees C and 9.31 MPa) was passed through 50 mL of a 25% (w/w) hexane miscella and then directed on-line through a SFC injector. After passing 300-L expanded CO2, the hexane concentrations in the L-CO2 were 0.05% and 0.04% for n-hexane and isohexane, respectively and the residual hexane concentrations in the SBO were 3.8 and 3.3 ppm, respectively. This technique provided real time on-line monitoring of the hexane separation process.
authors.affiliation: New Crops & Processing Technology Research, National Center for Agricultural Utilization Research, Agricultural Research Service, United States Department of Agriculture, Peoria, IL 61604, USA. ELLERFJ@NCAUR.USDA.GOV
authors.forename: Fred J
authors.initials: FJ
authors.lastname: Eller
authors.forename: Scott L
authors.initials: SL
authors.lastname: Taylor
authors.forename: Debra E
authors.initials: DE
authors.lastname: Palmquist
mesh_terms: D002138:Calibration; D002245:Carbon Dioxide / Q000737:chemistry*; D025924:Chromatography, Supercritical Fluid / Q000379:methods*; D006586:Hexanes / Q000302:isolation & purification*; D013024:Soybean Oil / Q000737:chemistry*
chemical_list: D006586:Hexanes; D002245:Carbon Dioxide; D013024:Soybean Oil