Glass Distillation Setups

Choose simple distillation when boiling points differ by more than 25 degrees C. Choose fractional distillation for mixtures with similar boiling points. Use steam distillation to extract temperature-sensitive natural compounds. Use vacuum distillation for compounds that boil above 200 degrees C at atmospheric pressure.

Fill the distillation flask between one-third and two-thirds of its capacity. For distilling 100 to 200 ml of liquid, use a 250 ml flask. For 200 to 500 ml, use a 500 ml flask. Always add boiling chips or a magnetic stir bar before heating to prevent bumping.

A fractionating column is only needed when boiling points are within 25 degrees C of each other. The Vigreux column is the most common choice for lab-scale work. For routine purification of solvents with well-separated boiling points, a fractionating column adds no benefit.

All components in a distillation setup must have matching ground-glass joint sizes. The most common size for educational and general lab use is 24/29. Research labs often use 29/32 joints. If you need to connect different sizes, a reducing adapter is available.

Simple distillation separates liquids in a single pass and works well when boiling points differ by more than 25 degrees C. Fractional distillation adds a fractionating column that provides multiple vapour-liquid equilibration stages, allowing separation of mixtures with similar boiling points like ethanol and water.

A rising thermometer reading means the lower-boiling component is depleting and composition is shifting. Collect separate fractions when the temperature rises. A wide temperature range indicates a mixture that requires fractional distillation, or the heating rate is too fast.

Bumping occurs when a superheated liquid suddenly boils violently. Prevent it by adding boiling chips or a magnetic stir bar to the flask before heating. Never add boiling chips to a liquid that is already hot as this can cause immediate violent boiling.

Distillation is complete when the thermometer reading drops and no more liquid drips from the condenser. Stop collecting when the temperature rises by more than 2 to 3 degrees C above the target boiling point. Never distil a flask to dryness.

Yes. All SmartLabs components use standard 24/29 ground-glass joints and are fully interchangeable. For simple distillation you need: a round-bottom flask, distillation head, condenser, vacuum adapter, and receiving flask. Add a Vigreux column for fractional distillation.