400tpd edible oil refining machine on-site installation by Huatai

"Refining" involves one or more of the following processes:

Distillation, which evaporates the solvent introduced during extraction by heating.

Degumming, which allows hot water (80°C) to be washed through the oil and stirred thoroughly and allowed to stand to precipitate gums and proteins.

Neutralization, or deoxygenation, which treats the oil with sodium hydroxide or sodium carbonate to remove free fatty acids, phospholipids, pigments and waxes.

Bleaching, which removes unpleasant colors, using diatomaceous earth, activated carbon, or activated clay to remove undesirable colors.

Dewaxing, or antifreezing, which improves the transparency of the oil, reduces the temperature, and removes precipitated solids.

Deodorization, which uses high-temperature and high-pressure steam to evaporate unstable compounds that may cause abnormal odors and taste.

Preservation, which adds preservatives to help stabilize the oil.

 

In addition, filtering, a non-chemical process that screens out large particles of impurities, can also be considered a refining step, although it does not change the state of the oil.

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