An azeotrope is a mix of two liquids that cannot be separated by distillation as the vapor of both liquids comes at the same time. It is sometime possible to separate the liquids anyway by using various techniques, one of them being vacuum distillation to break the azeotrope, another being salting out. However, these do not work in every case.
|Data source color code|
|CRC & Lange's||CRC only||Lange's only||other (see references)|
| Azeotropes of water, b.p.=100 °C
‡ CRC 44th ed. lists azeotropes for acetic acid/water and acetone/water, Lange's 10th ed. as well as numerous web sources indicate no azeotrope for these pairs.
| Azeotropes of ethanol, b.p.=78.4 °C
| Azeotropes of methanol, b.p.=64.7 °C
‡ CRC and Lange's disagree on this azeotrope, but web source corroborates CRC
Miscellaneous azeotrope pairs
- "What is an Azeotrope?". B/R Corporation. Archived from the original on 24 April 2007. Retrieved 24 March 2007.
- John Durkee (November 2000). "Binary Organic Azeotropes Useful for Solvent Cleaning" (PDF). metalfinishing.com. Retrieved 13 February 2011.
- Hilmen, Eva-Katrine (November 2000). "Separation of Azeotropic Mixtures: Tools for Analysis and Studies on Batch Distillation Operation" (PDF). Norwegian University of Science and Technology, dept. of Chemical Engineering. Retrieved 24 March 2007.
- Merck Index of Chemicals and Drugs, 9th ed. monograph 4653
- Ponton, Jack (September 2001). "Azeotrope Databank" (Queriable database). The Edinburgh Collection of Open Software for Simulation and Education, Edinburgh University. Archived from the original on 24 April 2007. Retrieved 24 March 2007.
- "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center.
- "Tetrahydrafuran (THF) Storage and Handling" (PDF). BASF. Retrieved 24 May 2007.
- "1,2-Propanediol". ChemIndustry.ru. Archived from the original on 21 December 2007. Retrieved 2007-12-28.