F

Fractional Distillation

P_A = x_A × P°_A (Raoult); α = P°_A/P°_B (separation factor)
Quick Reference
Formula / NotationP_A = x_A × P°_A (Raoult); α = P°_A/P°_B (separation factor)
Also Known AsColumn distillation, fractionation, rectification (industrial), reflux distillation

What is Fractional Distillation?

A distillation technique that separates mixtures of liquids with close boiling points using a fractionating column. The column provides multiple equilibrations between vapor and liquid, effectively concentrating more volatile components at the top. Used in petroleum refining.

Formula & Notation

P_A = x_A × P°_A (Raoult); α = P°_A/P°_B (separation factor)

Other Names / Synonyms: Column distillation, fractionation, rectification (industrial), reflux distillation

Properties & Characteristics

Fractional distillation is a distillation technique using a fractionating column packed with material to allow multiple vapour-liquid equilibrium stages (theoretical plates), enabling separation of mixtures with close boiling points. The column's efficiency is measured in theoretical plates (HETP = height equivalent to a theoretical plate). As vapour rises, it condenses, re-evaporates, and enriches in the more volatile component at each plate. Total condenser and partial condenser designs differ.

Uses & Applications

Fractional distillation is the principal separation technique in: petroleum refining (crude oil → gasoline, kerosene, diesel, lubricants, heavy fuel oil), air separation (liquid air → N₂, O₂, Ar), organic synthesis product isolation, and production of absolute (anhydrous) ethanol.

Safety Information

Flammable organic solvent fractional distillation requires: flame-free heat sources, anti-static equipment, adequate ventilation, and continuous supervision. Vacuum fractional distillation of high boiling point materials (bp >150°C at 1 atm) reduces fire risk but introduces implosion hazard from vacuum glassware.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Fractional Distillation
Formula P_A = x_A × P°_A (Raoult); α = P°_A/P°_B (separation factor)
Synonyms Column distillation, fractionation, rectification (industrial), reflux distillation

Frequently Asked Questions

A distillation technique that separates mixtures of liquids with close boiling points using a fractionating column. The column provides multiple equilibrations between vapor and liquid, effectively concentrating more volatile components at the top. Used in petroleum refining.

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