Types of distillation include:
Batch Distillation – A mixture of two volatile substances is heated until it boils. The vapor will contain a higher concentration of the more volatile component, so more of it will be condensed and removed from the system. This changes the ratio of components in the boiling mixture, raising its boiling point.
If there is a large difference in the vapor pressure between the two components, the boiled liquid will become higher in the less volatile component, while the distillate will be mostly the more volatile component.
Batch distillation is the most common type of distillation used in a laboratory.
Continuous Distillation – Distillation is ongoing, with new liquid fed into the process and separated fractions continuously removed. Because new material is input, the concentrations of the components should not change as in batch distillation.
Simple Distillation – In simple distillation, vapor enters a condenser, cools, and is collected. The resulting liquid has a composition identical to that of the vapor, so simple distillation is used when components have greatly different boiling points or to separate volatile from non-volatile components.
Fractional Distillation – Both batch and continuous distillation may incorporate fractional distillation, which involves use of a fractionating column above the distillation flask. The column offers more surface area, allowing for more efficient condensation of vapor and an improved separation. A fractionating column may even be set up to include subsystems with separate liquid-vapor equilibrium values.
Steam Distillation – In steam distillation, water is added to the distilling flask. This lowers the boiling point of the components so they may be separated at a temperature below their decomposition point.
Other types of distillation include vacuum distillation, short-path distillation, zone distillation, reactive distillation, pervaporation, catalytic distillation, flash evaporation, freeze distillation, and extractive distillation,