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Extraction of Plant Oils
Extraction of Oils from Seeds and Drupes (e.g. Olives)

1) The Plants are harvested.
2) They are taken to a factory to be crushed.
3) They are pressed and the oil is squeezed out.
4) Impurities are filtered out.
5) Water and solvents are removed through…

Page 2

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Oils are made of mainly unsaturated
hydrocarbons with a few saturated
hydrocarbons. Unsaturated fats have
a low melting point so they are too
runny to use on things like toast.

So, we hydrogenate them.

1) We react Hydrogen with the Oil
at 60C in the presence of a nickel

Page 3

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Too many of any type of oil or fat can lead to obesity and
health problems, however some are worse than others...

Oil and water are immiscible (they do not mix).

But... we can suspend the liquid in the other liquid. This is
called an emulsion. There are…

Page 4

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Milk (OilinWater)
Single cream
Double cream
Whipped cream
Ice cream
Moisturising lotion

Oil and water emulsions will naturally separate out we use
emulsifiers to keep them together.

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Emulsions have a longer shelf life because
they do not separate out

Food can be low in fat yet still have a good

Egg yolk is often used as an emulsifier so
people who are allergic need to check ingredients very


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