Crude oils as received from the extraction plant contain several non-triglyceride components which must be removed.
Refining consists of several processes which accomplish this aim.
A refining process is carried out following extraction of crude edible oils by means of screw presses and/or solvent extraction.
In refining, physical and chemical processes are combined to remove undesirable natural as well as environmental-related components from the crude oil.
These components comprise for example phosphatides, free fatty acids, pigments (such as chlorophyll), odors and flavors (including aliphatic aldehyde and ketone), waxes as well as heavy metals, pesticides etc. …