13/07/2024
What is a COOKING OIL
Basically edible oil has the following impurities which need to be removed for getting COOKING OIL.
1. Physical Impurities, Phosphatides (gummy matters), Free Fatty Acids, Coloring Pigments and Waxes.
1) PHYSICAL IMPURITIES:
Left over particles of oil seeds etc. By simple filtration process these impurities are removed.
2) PHOSPHATIDES, GUMS:
During pretreatment process gums and other impurities are either separated out, either through batch degumming or through continuous process with help of centrifugal separators. When impurities are only in small quantities Gum conditioning process is adopted, where in gums are just precipitated and are removed in next neutralizing process.
3) FREE FATTY ACIDS:
Popularly known as F.F.A. all vegetable oils are compound formed by Glycerin and Fatty Acids when Fatty Acid separates out from the bond with Glycerin they are termed as Free Fatty Acids. The free Fatty Acids are generally removed by neutralizing them with alkalis like caustic soda. The soap stock formed and the oil are then separated out by decantation process in Batch Neutralizing or by centrifuge separation in continuous neutralizing.
4) COLOURING PIGMENTS:
Depending on the quantity and type of color pigments present in the oil, oils have color ranging from light yellow, reddish} to dark brownish (as in crude cotton seed oil). To give uniform, color it is essential to bleach the oil with the help of bleaching agents like bleaching earth / activated carbon. Bleaching agents absorbs the coloring pigments. By filtration process the spent bleaching agent is filtered out. Sometimes caustic treatment in neutralizing section also reduces the color of oil specifically in cotton seed oil. In case of palm oil color is also reduced by heat treatment. Bleaching operation is performed either as batch process in smaller capacities or as continuous operation in large capacity plants.
5) ODOUR:
Every oil has its own district odor sometimes pleasing odor sometimes unpleasant odor. neutralizing and bleaching process also adds odor to the oil which is unpleasant. It is therefore essential to remove the odor from oil. Deodorization is the process to remove odoriferous matters from vegetable oils. The odor is removed by injecting open steam in the oil which is heated to high temperature and kept under high temperature and kept under high vacuum. The odiferous matter distills off at high temperature and high vacuum and is carried away through vacuum system. The oils is cooled.
6) WAXES:
Some oil like sunflower seed oil and maize germ (corn) oil have waxes present in them. At low temperature waxes appears and gives hazy appearance to oil. Consumer does not prefer such hazy appearance.
Dewaxing process is adopted for separation of waxes from oil. Oil is cooled and chilled in crystallizers the waxes are crystallized. The wax crystals are separated out either by cold neutralization in centrifuges or more common method of separation is filter them out in horizontal pressure leaf filters.
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