oil refining process

8/2/2019 Oil Refining Process

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Oil Refining Process

Split Column Continuous Physical Refining ProcessFreshly extracted crude oils contain a diverse group of undersirable impurities such as :

Naturally-occuring compounds, including pigments and phosphatides

Contaminants from the extraction process, such as metals

The phosphatides and metals are commonly present as gums, which are not easily handled. Bythe time you receive the oil, it will contain more, objectionable degradation products, including:

Peroxides, aldehydes, ketones, fatty acids and fixed pigments.

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Deodorisation:Bleached oil is further de-aerated. Next, it is heated to deodorising temperaturein two steps by the outgoing refined oil, or start-up heater, and then by a high-pressure steamgenerator. The oil then flows under high vacuum through a sequence of three vessels tocomplete the removal of impurities:

In the flash vessel, around 1/3 of fatty acids evaporate from the oil

In the pre-stripper, which features structured internal packing, aldehydes, ketones and thebulk of fatty acids are carried from the oil by stripping steam

In the deodoriser, removal of aldehydes, ketones and fatty acids is complete and remainingcarotenoid pigments decompose

The outgoing refined oil is cooled in three steps by bleached oil, incoming crude oil and coolingater. Antioxidant may be dosed and the refined oil is sent to storage.w

Fatty acids leaving the deodoriser in the vacuum vapour mixture are condensed in a scrubberand collected as fatty acid distillate for other applications.

Dry Fractionation ProcessFractionation is a physical modification process - so there is no chemical change to the products.

And of course in the dry fractionation process, there is no use of costly of hazardous chemicaladditives, no yield loss and no contamination of the oils. Because it produces no effluent, the dry

fractionation process is also environmentally friendly.


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Interesterification Process


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The process is as follows:

Neutral feedstock is pmped batch-wise to the interesterification vessel, or crude feedstockmay be neutralised in the vessel if suitably equipped.

The oil is heated under vacuum and dried.

A catalyst is added and the reaction proceeds.

After the reaction is complete, the catalyst is deactivated by dilute aqueous citric acid solutionThe finished oil is washed with water to remove soap by-products and then dried undervacuum.

A light post-bleaching step is carried out to remove residual soaps.

Continuous Physical Refining ProcessCrude edible oils contain a variety of undesirable impurities comprising:

Naturally occuring compounds (e.g. phosphatides, pigments)Contaminants (e.g. metals)

Degradation products (e.g. peroxides, aldehydes, ketones, fatty acids, fixed pigments)

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hosphatides and metals may be present as problematic gums.

Transforming these oils into quality food products requires a manifold approach. Our ContinuousPhysical Refining Plant integrates three specialised processes to produce a pure, stable, refined

edible oil that is bright and lightly coloured and free of odour and taste.

Dry Degumming: Incoming crude oil from storage is continually heated to degummingtemperature by outgoing refined oil, or by preheater during start-up. Food grade acid is constantly

osed and mixed with the oil.dThe oil-acid mixture flows to a degumming vessel. There, on contact with the acid, gums in the oildecompose to liberate phosphatides and metals, which are removed during adsorption bleaching.

Adsorption Bleaching:Degummed oil continues to a slurry tank under vacuum. Bleaching earths concurrently metered to the slurry tank to form a slurry of oil and earth.iThis slurry flows through a two-stage bleacher vessel. In the first stage, the slurry is heated tobleaching temperature. In the second stage, the bleaching reaction proceed and impurities, such


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Reference:

http://www.oiltek.com.my/products.html
http://www.oiltek.com.my/products.htmlhttp://www.oiltek.com.my/products.html

oil refining process

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