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Use of liquid carbon dioxide to remove hexane from soybean oil

2004; Wiley; Volume: 81; Issue: 10 Linguagem: Inglês

10.1007/s11746-004-1011-7

1558-9331

Fred J. Eller, Scott L. Taylor, Meredith S. Curren,

Mass Spectrometry Techniques and Applications

Abstract Liquid carbon dioxide (L‐CO 2 ) was investigated as a means to separate hexane from the mixture of soybean oil (SBO) and hexane resulting from the hexane extraction of soybeans. Using a fractionation tower, 5 vol of CO 2 (i.e., 100, 200, 300, 500, and 1000 L expanded gas) were passed through 50 mL of two concentrations of n ‐hexane (i.e., 10 and 25% w/w) in SBO. After passing through the hexane/SBO mixture, the expanded CO 2 was passed through a chilled collection flask to capture extracted hexane and SBO. The raffinate SBO was removed from the column and analyzed for residual hexane using International Organization for Standardization Method 9832:2002. Residual hexane decreased as the amount of L‐CO 2 used increased and was less than 20 ppm after 200 L of CO 2 . The amount of SBO extracted increased with the volume of CO 2 used. Significantly more SBO and hexane were collected from the 25% sample than the 10% sample. During the extraction of the mixture, the CO 2 selectively carried over TG with lower M.W. This research demonstrates the ability to use L‐CO 2 to remove haxane from mixtures of hexane and SBO at both low pressures and temperatures.