
doi: 10.1007/bf03040151
The foregoing results may be taken to indicate that in so far as cottonseed oil is concerned the fractions of oil obtained from the hydraulic press at different periods during the operation show some definite variations in some of their physical characteristics but nothing conclusive is shown by the chemical constants The salient facts brought out may be summarized as follows: (1) The color of the crude oil increases as the press operation nears completion. The index of refraction also increases slightly but consistently. (2) Considerable variations occur in the pereentage of free fatty acids, saponification and iodine values but the variations occur without any definite relationship to the various fractions. (3) The refining losses by the cup method were lowest in the case of the first two fractions but the absolute refining-loss method showed a higher percentage of neutral oil in the last fraction than in any of the others. (4) The color of the oil from the several fractions shows only moderate differences after refining with caustic; the last fractions from the press showed very nearly the same amount of red as the first fraction. Fuller’s earth, however, did not bleach the last fractions of oil quite so much as those obtained earlier in the operation.
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