• A. Distillation is used for the chloroform - aniline (IV).This method lowers the boiling point of liquids by reducing pressure, allowing separation of heat-sensitive compounds without decomposition.
• B. Fractional distillation is utilized for the separation of crude oil fractions (III). It involves a fractionating column that separates various components of crude oil based on their differing boiling points.
• C. Steam distillation is effective for separating aniline - water mixtures (II). This technique uses steam to separate substances with high boiling points or compounds immiscible with water.
• D. Distillation under reduced pressure is applied for separation of glycerol from spent-lye (I). Distillation works by heating the mixture to evaporate the component with a lower boiling point and condensing it in a separate chamber, useful for separating components in solutions.