Standard setups described in ASTM D95 PDFs typically include:
When the sample and solvent are heated, the solvent vaporizes and mixes with the water vapor. Because the solvent is immiscible with water, they form a heterogeneous azeotrope. This mixture distills over and condenses. Upon condensation, the solvent and water separate into two distinct layers due to their immiscibility. The water, being denser, settles to the bottom of a graduated trap, while the lighter solvent overflows back into the distillation flask. This process continues until all water is removed from the sample. Astm D95 Pdf