Refining Technology by Desmet - - World leader in oils & Fats technologies - extraction of oilseeds - vegetable oils

Degumming technology by De Smet



Degumming is the first operation in refining. The Impac® Degumming process consists of a mere hydration of the crude oil. Certain impurities like phospholipids, gums and proteins are soluble in oil in their anhydrous form, but insoluble once they are hydrated. This is how the hydratable phospholipids are removed from the oil. Part of the constituents however remain in the oil, and an acid treatment is needed to remove them.
Water degumming is more generally carried out in the extraction plant rather than in the refinery, lest foots should conglomerate in the crude oil intermediate tanks.
The aqueous phase obtained after degumming separation is recirculated into the meal stream of the toaster. Should lecithin be of significant commercial value, it can be dried separately.

De Smet supplied over 200 wet and 250 dry degumming units.

De Smet has supplied over 145 neutralising units.



This operation consists in neutralising the free fatty acids, using caustic soda. The process transforms the free atty acids into soaps.
These are no longer soluble in water and can be removed easily by decantation or centrifugal force. The removal of the free fatty acids does not close neutralisation, as the operation also eliminates the phospholipids that are not hydrated at degumming level, and it reduces the amount of metal traces as well as some pigments and minor constituents.


De Smet has supplied over 145 neutralising units.

Bleaching technology



Bleaching is the process operation which is carried out before deodorisation.
In addition to colouring matters, the bleaching treatment using actived earth will remove residual phosphatides, metals, soaps and oxidation products.
Bleaching in 3 stages : Bleaching is performed in 3 stages ...
Initial mixing of oil with bleaching earth under controlled conditions of temperature, acidity and humidity for a specific residence time. Secondly the oil is heated under vacuum with sparge steam to ensure proper mixing with bleaching earth for a specific residence time.


De Smet has supplied over 530 bleaching plants

De Smet, World leader in winterising plants



Winterisation is an operation designed to preserve limpidity and refined oils brightness.
The Wintrend® process consists in removing from these oils, mainly maize and sunflower, small quantities of solids that cause cloudiness when the oil is kept at ambient or low temperature. These solid substances can be saturated glycerides or waxes. Thanks to the relatively small amount of solids - between a few hundred and 2000 ppm - winterising is a continuous and, therefore, cost-effective process. In order to obtain an oil with good stability, the wax content needs to be reduced to a level of less than 10 ppm. To achieve this, the variables of time, temperature and agitation require special care to produce oil in a closely controlled range.


De Smet supplied over 110 winterising plants
Degumming technology by De Smet


De Smet supplied over 200 wet and 250 dry degumming units.

De Smet has supplied over 145 neutralising units.


De Smet has supplied over 145 neutralising units.

Bleaching technology


De Smet has supplied over 530 bleaching plants

De Smet, World leader in winterising plants


De Smet supplied over 110 winterising plants

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