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AZEOTROPIC DATA FOR BINARY MIXTURES

Liquid mixtures having an extremum (maximum or minimum) vapor pressure at constant temperature, as a function of composition, are called azeotropic mixtures, or simply azeotropes. Mixtures that do not show a maximum or minimum are called zeotropic. Azeotropes in which the pressure is a maximum are often called positive azeotropes, while pressure-minimum azeotropes are called negative azeotropes. The coordinates of an azeotropic point are the azeotropic temperature t az, pressure P az , and liquid-phase composition, usually expressed as mole fractions. At the azeotropic point, the vapor-phase composition is the same as the liquid-phase composition.

This table gives azeotropic data for a number of binary mixtures at normal atmospheric pressure (P az =101.3 kPa). Component 1 of each mixture is given in bold face. The temperature t az and mole fraction x1 of component 1 are listed for each choice of component 2.

The components are arranged in a modified Hill order, with substances that do not contain carbon preceding those that do contain carbon.

REFERENCES

1.Lide, D.R., and Kehiaian, H.V., CRC Handbook of Thermophysical and Thermochemical Data, CRC Press, Boca Raton, FL, 1994.

2.Horsley, L.H., Azeotropic Data, III, American Chemical Society, Washington, D.C., 197

Molecular

formula Name t az/°C x1

Water H2O

CHCl3Trichloromethane56.10.160

CH2O2Formic acid107.20.427

CH3NO2Nitromethane83.60.511

CS2Carbon disulfide42.60.109

C2H3N Acetonitrile76.50.307

C2H5NO2Nitroethane87.20.624

C2H6O Ethanol78.20.096

C4H8O2Ethyl acetate70.40.312

C4H10O1-Butanol92.70.753

C4H10O2-Butanol870.601

C5H5N Pyridine93.60.755

C5H11N Piperidine92.80.718

C5H12Pentane34.60.054

C6H5Cl Chlorobenzene90.20.712

C6H6Benzene69.30.295

C6H6O Phenol99.50.981

C6H10Cyclohexene70.80.308

C6H12Cyclohexane69.50.300

C6H14Hexane61.60.221

C7H8Toluene84.10.444

C7H16Heptane79.20.452

C8H101,3-Dimethylbenzene920.767

C8H10Ethylbenzene920.744

C8H18Octane89.60.673

C8H18O Dibutyl ether92.90.781

C9H20Nonane94.80.970

C12H27N Tributylamine99.70.976

Tetrachloromethane CCl4

CH2O2Formic acid66.70.569

CH3NO2Nitromethane71.30.660

CH4O Methanol55.70.445

C2H3N Acetonitrile65.10.566

C2H6O Ethanol65.00.615

C3H6O Acetone56.10.047

C3H8O1-Propanol73.40.820

C4H10O1-Butanol76.60.951

Formic acid CH2O2

CS2Carbon disulfide42.60.253

Nitromethane CH3NO2

CS2Carbon disulfide41.20.845

Methanol CH4O

C3H6O Acetone55.50.198