"fractional distillation." YourDictionary, n.d. Web. 17 January 2019. <https://www.yourdictionary.com/fractional-distillation>.
fractional distillation. (n.d.). Retrieved January 17th, 2019, from https://www.yourdictionary.com/fractional-distillation
A process by which a chemical compound is separated into components by distillation. In fractional distillation the compound is heated and, as each of its constituent components comes to a boil, its vapors are separated and cooled, so it can be removed in its pure form. Fractional distillation is used to refine petroleum.