In bleaching fatty oils an equilibrium exists between two reactions favorable and two unfavorable in respect to color reduction. Adsorption of color and oxidative decrease in color are favorable. Oxidative increase in color and oxidative stabilization against adsorption are unfavorable. Adsorbents are shown to catalyze these oxidative reactions. Under any comparable set of conditions signifi‐cantly lower colors results when bleaching is carried out under vacuum or in an inert atmosphere. Multiple stage bleaching under atmospherie conditions shows no advantage because of the adverse oxidative effect but may be advantageous under vacuum conditions. Low pH earths respond better than high pH earths to vacuum bleaching with respect to improved color removal and oil stability.
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King et al. (1949) studied this question.
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