Brief description

Distillation is a physical process of separating the components or substances from a liquid mixture by using selective boiling and condensation.

It allows you to purify water, concentrate alcohol for medical or fuel use, and extract essential oils from plants.

Use / Function

Its practical purpose is separation and purification:

• Water Purification: Removing salts, bacteria, and impurities (desalination).
• Alcohol Concentration: Increasing ethanol content beyond what fermentation can achieve (for antiseptics, fuel, spirits, Rectified Spirits).
• Extraction: Obtaining essential oils and perfumes from plants.
• Refining: Separating crude oil into useful fractions (advanced).

Operating principle

The core principle is the difference in boiling points of various substances.

1. Heating: The mixture is heated.
2. Vaporization: The component with the lower boiling point turns into vapor first (e.g., Alcohol at ~78°C, Water at 100°C).
3. Transport: The vapor travels away from the heat source.
4. Condensation: The vapor is cooled (usually by passing through a tube cooled by water or air) and turns back into a liquid.
5. Collection: The condensed liquid (distillate) is collected in a separate container.

How to create it

Minimum functional version (Solar Still)

1. Dig a hole: In the ground.
2. Place container: In the center.
3. Fill: Put impure water/vegetation around the container (not inside).
4. Cover: Plastic sheet over the hole, weighed down with a stone in the center (over the container).
5. Wait: Sun evaporates water, it condenses on the plastic and drips into the container.

Functional version (Pot Still)

1. Boiler: A pot with a lid that seals well (use dough to seal gaps).
2. Condenser: A copper tube or bamboo pipe coming out of the lid.
3. Cooling: The tube passes through a container of cold water or is long enough to air cool.
4. Receiver: A vessel to catch the drips.

Materials needed

• Essential materials:
  • Heat Source: Fire, sun.
  • Vessels: Boiler and receiver (Clay, Metal, Glass).
  • Condenser: Tube (Copper is best for heat transfer and removing sulfur compounds; Glass; Bamboo).
• Tools:
  • Sealing material: Flour paste, clay, or cork to prevent steam loss.

Variants and improvements

• Fractional Distillation: Using a column to separate liquids with close boiling points.
• Steam Distillation: Passing steam through material (plants) to carry volatile oils.
• Reflux: Allowing some vapor to condense and fall back to increase purity.

Limits and risks

• Explosions: A blocked system creates a pressure bomb. ALWAYS ensure the path is open.
• Methanol: In alcohol distillation, the “foreshots” (first part) can contain methanol, which is toxic (blindness/death). Discard the first portion.
• Burns: Steam causes severe burns.
• Material Safety: Don’t use lead solder or toxic materials in the construction.