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    Physical refining of edible oils using nitrogen as stripping gas. Process optimization

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    The use of nitrogen as a stripping gas in physical refining of edible oils represents a technological improvement with potential advantages such as the possibilities of recovering high quality deodorized distillates and eliminating pollution. <br /> The objectives of the present paper are to study, evaluate and optimize, as far as possible, independent variables involved in the process (nitrogen flow, operating temperature and the height of the oil layer inside the deodorizer) in reference to the quality of the obtained oils as well as the manufacturing requirements. <br /> All the experiments were carried out with sunflower oil in a discontinuous deodorizer with a 200 Kg capacity. A 4x4 latin square experimental design was used, consisting of three factors, each of which had four different levels. <br /> The results led to the establishment of charts that allow to determine the most suitable conditions in which to carry out the processing in accord with the desired quality of the finished oil and the functional objectives of the factory. These charts are presented in the paper. The results were checked by another set of experiments.<br><br>La utilizaci贸n de nitr贸geno como gas de arrastre en la refinaci贸n f铆sica de aceites comestibles representa un avance tecnol贸gico con ventajas potenciales, como la posibilidad tanto de recoger destilados de desodorizaci贸n de alta calidad como de eliminar poluci贸n.<br /> Los objetivos del presente trabajo son estudiar, evaluar y optimizar, tanto como sea posible, las variables que intervienen en el proceso (flujo de nitr贸geno, temperatura de operaci贸n y altura de la capa de aceite en el desodorizador) en funci贸n de la calidad de los aceites obtenidos as铆 como de los requerimientos de producci贸n. <br /> Los ensayos se han realizado con aceite de girasol en un desodorizador discontinuo de 200 kg de capacidad. Se ha utilizado un dise帽o de experimento en cuadrado latino de 4x4, constituido por tres factores a cuatro niveles cada uno. <br /> Los resultados obtenidos han permitido establecer abacos adecuados para determinar las condiciones m谩s interesantes en las que llevar a cabo el proceso, seg煤n la calidad de aceite final deseada y la funci贸n objetivo de la factor铆a. Dichos 谩bacos son presentados en el trabajo. Los resultados se han contrastado mediante una nueva serie de experiencias
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