1. Methods of Extraction of Essential Oils
Distillation
Expression
Solvent extraction

2. Distillation – Most oils
Steam Distillation

3. Distillation
Water distillation
Water and steam distillation

4. Distillation Fractional Distillation E.g. Cananga odorata Cohobation
E.g. Rosa damescena
Rectification
E.g. Eucalyptus globulus

5. Expression – Citrus oils
Sponge Process
Equelle à piquer
Machine abrasion

6. Solvent extraction Volatile hydrocarbons Extract Concrete / resinoid
ABSOLUTE
Alcohol Mixture
Chilled & Filtered Distilled at low temp
Concrete / resinoid
Heat & alcohol
EO dissolves in alcohol
Extract
Heat
Volatile hydrocarbons
E.g. hexane, petroleum ether, ethanol
Dissolves EO

7. Solvent extraction Enfleurage - Delicate flowers
5 - 20% of production now

8. Solvent extraction CO2 Extraction 33º C Hypercritical state
Solvent action
Low temp & inert gas = no chemical reactions
Lowering pressure reverts CO2 to gas to be removed