A laboratory centrifugal refining method for control application

Abstract

A control method is presented for selecting the appropriate processing conditions for alkali refining of crude vegetable oils by the centrifugal process to yield lowest losses with satisfactory color. This technique is sufficiently analogous to actual processing conditions to provide reliable information upon which plant performance can be based.The cup method cannot be used in this manner in that it no longer approximates operating procedures as in the days of kettle refining. The chromatographic neutral oil method, on the other hand, provides an index of the amount of oil available for recovery without regard to the possibility of attaining such levels.For these reasons the centrifugal method fills a void of long standing. Other tangible benefits that accrue from this technique are: selection of sources of oil that can be most profitably refined by establishing the relative value of competitive oils, and a means of evaluating plant efficiency.

Characterization and processing of cottonseed oil obtained by extraction with supercritical carbon dioxide

“…Included are typical comparative data for CO2extracted cottonseed oil. According to the literature, cottonseed oil is refined with a sufficient excess of caustic to give the desired color consistent with a low refining loss (6). Refined, bleached and deodorized cottonseed oils typically range from 4 to 7 red units in color compared to 1.0-2.5 red units for shortening stocks (9).…”

“…Representative samples of commercial crude prepress-solvent and expeller crude cottonseed oils used for comparative studies were obtained from reliable sources. Color fixation was determined by refining the crude oil at 25 C according to the method of Pohle et al (6) and determining the refined color. Samples (4 oz) of the crude were then placed in wide-mouthed jars and stored at 40 C and 60 C in a forced-draft oven for varying lengths of time, followed by refining and color determination.…”

“…Materials, extraction and analytical methods were described previously (4). Oil processing methods were described by List et al (6). Wet-milled corn germ was obtained at the 1presented in part at AOCS meeting, Toronto, Ontario, Canada, May 1982. commercial wet grinding step in starch processing.…”

“…Previous reports from this laboratory have described the extraction of soybeans and corn germ oil with supercritical carbon dioxide (SC-CO2) (4)(5)(6)(7)(8)(9). The work reported here describes preliminary studies on characterization and processing of crude corn oils obtained by extraction of wet-and dry-milled corn germ with SC-CO2 at 50-90 C and pressures ranging from 8-12,000 psi.…”

Συμβολη Στη Μελετη Του Εξευγενισμου Υψηλοβαθμων Πυρηνελαιων

“…Οι απώλειες υ πολογίζονται με μέθοδο απορρόφησης σε στήλη αλούμινας (195). Ακόμη μέθο δος φυγοκεντρικού διαχωρισμού του σάπωνος παρέχει αποτελέσματα ευρισκό μενα μεταξύ των αντιστοίχων της χρωματομετρικής και της μεθόδου-δοχείου (cup) (196). Σε έλαια μεγάλης οξύτητας ο προσδιορισμός του ουδετέρου ε λαίου γίνεται με απορρόφηση σε στήλη αλούμινας (197).…”