oil refinery, oil deodorization, edible oil refining plant

    After solvent extraction, the crude oil is separated and the solvent is evaporated and recovered. The seed pulp residues are conditioned and reprocessed to make by-.    The crude vegetable oil is then put through further refining techniques including degumming, neutralization and bleaching:

    Deodorization is the final step in the refining of vegetable oils. Pressurize steam at extremely high temps (500 degrees or more) is used to remove volatile compounds which would cause off odors and tastes in the final product.

The oil produced is referred to as "refined oil" and is ready to be consumed or for the manufacture of other products. A light solution of citric acid is often added during this step to inactivate any metals such as iron or copper present in the final product.