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Some basic factors in the bleaching of fatty oils

  • Published:
Journal of the American Oil Chemists’ Society

Abstract

The physical and chemical properties of bleach-ing clay are presented, and the effects of these properties upon its performance in bleaching. Various bleaching effects are described:

  1. 1)

    Comparison of atomspheric vs. vacuum bleaching, showing the superiority of one or the other depends upon the predominance of oxidative color fading or color fixation/ color formation in the atmospheric bleach.

  2. 2)

    The log-log bleach curve of clays carried out to extreme dosage.

  3. 3)

    Bleaching time-temp effects on different oils, showing that up to a given time, high temp bleaching gives a lighter color than low temp ; however, with increased time the high temp bleached oil darkens rapidly in con-trast to the low temp oil, which levels out with time.

  4. 4)

    The effect of adding clay to hot oil vs. ad-ding it to “cold” oil, indicating a better bleach when the clay is added to the cold oil, with an explanation for the effect.

  5. 5)

    Comparison of bleaching by filtration of the oil through a layer of clay against conventional bleaching, indicating superior-ity for the former.

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References

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Author information

Authors and Affiliations

  1. Bennett-Clark Company, Inc., Nacogdoches, Texas

    A. D. Rich

Authors
  1. A. D. Rich
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Cite this article

Rich, A.D. Some basic factors in the bleaching of fatty oils. J Am Oil Chem Soc 41, 315–321 (1964). https://doi.org/10.1007/BF02667028

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  • DOI: https://doi.org/10.1007/BF02667028

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