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Process Introduction

Degumming

Bleaching & Deodorization

Quality Department

Bleaching & Deodorization

Bleaching & Filteration

Purpose of the bleaching process is the complete or partial removal of colour bodies (pigments) from the oil. The pigments can be destroyed through chemical attack by oxidizing agents. The colour of the neutralised oil is improved by treating the oil with bleaching earth or a mixture of bleaching earth and carbon, that absorbs the colouring substance dissolved in oil.

The bleacher is divided into two compartments in order to prevent short circuiting of oil/bleaching earth slurry and equipped with an agitator in each compartment to maintain good mixing of earth and oil. After the bleacher, the slurry of hot oil and bleaching earth is transferred to filter section.

The filteration takes place in two alternatively operating pressure leaf filters, where the bleaching earth is completely removed from the oil. While one filter is in operation the other filter is blow with steam in order to remove residual oil in the bleaching earth. After filteration, oil is passed through one of the alternatively working polish filters before going to the deodorisation.

Deodorization

In the conventional edible oil refinery Deodorization is the last in a series of process steps used to improve the taste, odour, colour and stability of the oils by the removal of undesirable substances. The materials removed by deodorisation include FFA, various flavours and odiferous compounds classified largely as aldehydes, ketones and hydrocarbons.

Deodorisation is primarily a high temperature, high vacuum, steam distillation process. Alfa Laval continuous deodoriser is based on the latest technology using double shell arrangement, which reduces reflux and ensures that air does not bubble through oil in the event of leakage. The hot oil is enters the deodoriser and flows continuously under vacuum through a number of trays via specially designed over flow channels. As the oil progresses through deodoriser, fatty acids, aldehydes, ketones and other unwanted materials are vapourised and carried out with the stripping steam.

Physical Refining

In recent years, there is a development of new technology, which is not utilize any chemical at neutralisation of oil for removing of various impurities from the oils, after suitable pre-treatment to the oil refining is done by using physical methods of separation. Physical refining is process in which oils are refined using steam and physical methods of separation. This technology is mostly useful for high FFA oils like palm oil, coconut oil etc.

By using this process we can control peroxide value and due to this the shelf life will be good.