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Adsorption onto porous solids is used to remove from oils not only pigments but also several other minor components. Now that long established process steps such as degumming, neutralization, and washing have become even more effective, the technique of adsorption is being continually evaluated to ensure that no unjustified expenditure is allowed to continue. Practical advice is offered on bleaching procedures and the subsequent separation of the adsorbent from the oil.
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H.B.W. Patterson (1976) studied this question.
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