%0 Journal Article
%T A bleaching earth from egyptian local deposits
%A Megahad
%A Ola A.
%A El Kinawy
%A Omayma S.
%J Grasas y Aceites
%D 2001
%I Consejo Superior de Investigaciones Cient赤ficas
%X The present investigation deals with the bleaching of vegetable oils using activated clays collected from some deposits in Egypt as compared to Tonsil FF currently used by local oil industry. The comparison was made; not only on the basis of the decolourising power of the earth, but also on the basis of its effects on the oil acidity, formation of the oil peroxides and the decomposition rate of the formed peroxides to aldehydes and ketones during the bleaching process. The activation of the collected earth samples was made using 4N HCl, 6N HCl and 30 % H2SO4. The bleaching tests of the activated samples were performed using the major four oil types processed in Egypt being cottonseed, sunflower, soybean and palm oils. In addition to the laboratory-evaluation tests, the performance of the activated samples, which showed promise on the lab-scale have been also tested on an industrial scale. The industrial application has proved that the activated local earth's can be successfully used as bleaching earth of local oils. Thus it can be used as a substitute of the varieties currently imported and used by the local oil sector. La presente investigaci車n trata de la decoloraci車n de aceites vegetales usando tierras activadas obtenidas de yacimientos egipcios, compar芍ndola con el Tonsil FF usado normalmente en la industria ole赤cola local. La comparaci車n se realiz車, no s車lo sobre la base del poder decolorante de la tierra, sino tambi谷n sobre la base de sus efectos en la acidez del aceite, la formaci車n de per車xidos y la velocidad de descomposici車n de los per車xidos formados en aldehidos y cetonas durante el proceso de decoloraci車n. La activaci車n de las muestras de tierras recogidas se hizo utilizando ClH 4N, ClH 6N y H2SO4 30 %. Los tests de decoloraci車n de las muestras activadas se llevaron a cabo usando los cuatro tipos mayoritarios de aceites procesados en Egipto: aceite de semilla de algod車n, de girasol, de soja y de palma. Adem芍s de los tests a escala de laboratorio, la evaluaci車n de las muestras activadas, se realiz車 a escala industrial. La aplicaci車n industrial ha demostrado que las tierras locales activadas pueden ser utilizadas con 谷xito como tierras decolorantes de aceites locales. De este modo pueden usarse como sustitutos de las variedades mas frecuentemente importadas y usadas por el sector aceitero.
%K Adsorbent
%K Bleaching
%K Vegetable oil
%K Aceite vegetal
%K Adsorbente
%K Tierra decolorante
%U http://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/375/378