Extractive distillation

{
  "id": "MLC-T-CHM-004296",
  "term": "Extractive distillation",
  "field": "Chemistry",
  "definition": "A distillation technique used to separate components of a liquid mixture that have close boiling points or form an azeotrope. A high-boiling, non-volatile solvent is added to the mixture, which selectively alters the relative volatilities of the original components, making their separation by distillation feasible. For example, n-methylpyrrolidone is used as the solvent to separate butadiene from other C4 hydrocarbons in industrial processes.",
  "subject": "Analytical Chemistry",
  "references": [
    "PAC, 2016, 88, 517. 'Glossary of terms used in extraction (IUPAC Recommendations 2016)' on page 528 (https://doi.org/10.1515/pac-2015-0903)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/extractive-distillation/"
}