OIL++AND++FAT+TECHNOLOGY+LECTURES+IV+Refining

OIL++AND++FAT+TECHNOLOGY+LECTURES+IV+Refining - OIL AND FAT...

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OIL AND FAT TECHNOLOGY LECTURES IV (Refined Oil Production) Prof.Dr.Aytaç SAYGIN GÜMÜŞKESEN Yrd.Doç.Dr.Fahri YEMİŞÇİOĞLU
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Refining of crude oil 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.
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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.
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Depending on the requirements, the  following basic processes are  implemented: degumming for removal of phosphatides, neutralization for removal of free fatty acids, bleaching for removal of color, deodorization to distill odors and flavors as well as free fatty acids and winterization for separation of waxes.
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Refining Methods Chemical Refining Degumming Neutralizing Bleaching Deodorization Physical Refining Degumming Bleaching Steam distillation
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The aim of degumming operation; The emulsifying action of phospholipids increases oil losses during alkali refining. Gums lead brown discoloration of oil after heating during deodorization. Salts may be formed with cooper, magnesium,calcium and iron, accelerating oxidative degredation of oil. Certain phospholipids, such as lecithin,
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This note was uploaded on 01/28/2011 for the course CHE 160 taught by Professor Blanche during the Spring '10 term at University of California, Berkeley.

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OIL++AND++FAT+TECHNOLOGY+LECTURES+IV+Refining - OIL AND FAT...

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