The Bleaching of Cottonseed Oil by Sepiolite

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Date
1967
Authors
Dandy, A.J.
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Abstract
At 100° c., air-dried sepiolite possesses an activity for bleaching cottonseed oil which compares fairly well with some Fuller's earths. Other factors such as filtration rates and oil retention compare less favourably, but in certain circumstances these may well be offset by economic considerations. Preheating of sepiolite samples at 100° C. in air before mixing with cottonseed oil drastically reduced their activities for bleaching the samples of oil investigated; this decrease has been shown to be connected with the variation in water content of the adsorbent, and not to variations in surface area calculated from nitrogen absorption isotherms. Water removal probably results in partial collapse or smoothing of the porous structure. The external surface only of the preheated adsorbents appears to be involved in the absorption process. Changes in the structure of adsorbent samples caused by preheating at various temperatures are accompanied by changes in bleaching activities.
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East African Agricultural and Forestry Journal, XXXII (3), pp. 256-264
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