Understanding The Oil Refining Process

The edible oils in their rough state are full of fatty acids and need thorough refining before they can be actually used for consumption

. This oil refining process defined the quality of oil we actually get for our home use. The most important stage of this process is the removal of fatty acids and preventing the oil from oxidation. Many people think oil refining process is limited only to the removal of fatty acids but it is much more than that. It also includes removal of undesired elements, colour and odour which otherwise may cause harsh impact on the taste, odour, and appearance of the product. In this way, the final oil is thinner without fatty acids, colourless and odourless. Lets take a close look on the oil refining process.

During the neutralization process, the oil is neutralized in the neutralizer in order to remove the fatty acids by reacting with caustic soda (NAOH). Oil is heated up to about 60C by thermic fluid coils and oil is stirred by stirrer. The fatty acids are settled at the bottom as alkali soaps which is called soapstock from where it is taken out into soap pan.

Next thing to process is the impurities and colour. This neutralized oil is then passed through another vessel called bleacher where colour of the oil is removed by bleaching process with the use of chemicals such as carbon black and bleaching clay. During the process, Oil is generally heated up to 110C by thermic fluid coils. Stirring is also used. Bleaching process is done under high vacuum. Bleached oil then moves to filtration process where bleaching clay and chemicals are removed and cleaned.

In order to remove the unpleasant smell out of oil, the neutralized oil is passed through deodorizer in which oil is heated above 110 degree Celsius through thermic fluid coils and then live steam is used to the oil from the bottom steam nozzles. The temperature of oil is raised up to 200 to 220C through thermic fluid coils and the entire process is done under high vacuum. In this way, smell is removed from the oil in the deodorizer. Then it moves to cooler where cold water circulating coils take away heat and oil is cooled.

Micro filtration is done after cooling down oils temperature in desired cooler. This process is carried out in a micro filter closet which makes the final edible oil processing that is known as refined edible oil. This micro filtration process is specifically designed for more effective filtration and best quality of final refined edible oil.

by: Ashish

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