About Soybean Oil Pressing And Refining

Soybean oil is a very common vegetable oil that is made from soybeans through a number of steps, including pressing and refining. Let's learn more about the soybean oil pressing and refining process.

Soybean oil pressing

The process of preparing soya oil begins with the pressing of clean, peeled and milled soya beans. The main steps in soybean oil pressing are heating, crushing, pressing, dewatering, degumming and separation. Specifically, the process of pressing soya bean oil is as follows:

Heating: clean soya beans are added to a steam pan for heating to increase the oil content of the soya beans.

Crushing: The heated soybeans are fed into a crusher to break them into small, fine particles.

Pressing: The small grains of soybeans are fed into the press for pressing and the oil from the press is stored separately from the solids.

Dehydration: The oil and solids from the press are separated and the oil-water mixture is placed in a centrifuge for centrifugation to separate the soybean oil from the water.

Degumming: Soybean oil is heated to a certain temperature and alum and other substances are added to degum the oil, making it clearer and more transparent.

Separation: The degummed soya bean oil is stored in an oil-water separator for separation, resulting in pure soya bean oil.

Soybean oil refining

Once the initial preparation of soya oil has been obtained, refining is required to improve the quality of the oil. The soybean oil refining process includes a number of steps such as de-acidification, de-odourisation, de-colourisation, de-odourisation and de-mixing. Specifically, the process of soybean oil refining is as follows:

Acid removal: through alkali refining or physical acid removal methods, the free fatty acids dissolved in water and other harmful substances are removed.

Deodorisation: The odour and fishy taste of soybean oil is removed through steam deodorisation and physical deodorisation.

Decolourisation: Removal of pigments from soya bean oil by means of decolourisers, adsorbents etc. to make it more transparent.

Odour Removal: Making soya bean oil sweeter by removing dull tasting substances etc.

Removal of impurities: through filtration, centrifugation, precipitation and many other steps to remove impurities from soybean oil.

In summary, the two important steps in the preparation of soya oil are pressing and refining. Through a rigorous processing process, we can obtain high quality soya bean oil that is excellent in taste and nutritional value.