Etiket Arşivleri: solvent extraction

Purification Techniques ( Hermenegildo García Gómez )

This booklet deals with purification of the organic product after completion of the main reaction.

Crystallisation

Suction Filtration

Solvent Extraction

Partition Coefficient or Distribution Ratio

Fractional Distillation

Assessing Purity

MELTING POINT

Thin Layer Chromatography TLC

Oil and Fat Technology Lectures 3 ( Dr. Aytaç SAYGIN GÜMÜŞKESEN )

OIL AND FAT TECHNOLOGY LECTURES III

(Crude Oil Production)

Prof.Dr.Aytaç SAYGIN GÜMÜŞKESEN
Yrd.Doç.Dr.Fahri YEMİŞÇİOĞLU

Extraction of Vegetable Oils

Basic approaches :
Mechanical Oil Extraction
– cold pressing means no heat applied
– hot pressing – external heat is applied
Solvent Extraction
– organic solvent (hexane, isopropyl alchool)
– supercritical solvent (carbondioxide)
Mechanical oil extraction
Mechanical oil extraction (expression) is a solid-liquid phase seperation method which is applied to cooked seed flakes.
It can be executed by batch, mainly hydraulically, and by continous, mainly mechanically, working presses.
Screw presses;
In oil industry, screw presses (expellers) are mostly utilized for expression. The main parts of continous-screw press are;
Seed feeder,
Cone-shaped cage
Adjustable cone for press-cake outlet
Worm (pressure and feed)

Oil and Fat Technology Lectures 4 ( Dr. Aytaç SAYGIN GÜMÜŞKESEN )

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.

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.