Words and Expressions Distillation n.蒸馏 distil v. Distillation --a unit operation whereby components of a liquid mixture are separated by boiling because of their difference in vapor pressure. Evaporation---removing volatile solvent from nonvolatile solute in solution. Drying---volatile liquid (usually water)are removed from solid materials. Words and Expressions Distillation n. 蒸馏 distil v. Distillation --- a unit operation whereby components of a liquid mixture are separated by boiling because of their difference in vapor pressure. Evaporation--- removing volatile solvent from nonvolatile solute in solution. Drying--- volatile liquid (usually water) are removed from solid materials