Azeotrope tables

This page contains tables of azeotrope data for various binary and ternary mixtures of solvents. The data include the composition of a mixture by weight (in binary azeotropes, when only one fraction is given, it is the fraction of the second component), the boiling point (b.p.) of a component, the boiling point of a mixture, and the specific gravity of the mixture. Boiling points are reported at a pressure of 760 mm Hg unless otherwise stated. Where the mixture separates into layers, values are shown for upper (U) and lower (L) layers.

The data were obtained from Lange's 10th edition[1] and CRC Handbook of Chemistry and Physics 44th edition[2] unless otherwise noted (see color code table).

A list of 15825 binary and ternary mixtures was collated and published by the American Chemical Society.[3] An azeotrope databank is also available online through the University of Edinburgh.[4]

Binary azeotropes

Data source color code
CRC & Lange's	CRC only	Lange's only	other (see references)

Azeotropes of water, b.p.=100 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav with various alcohols ethanol 78.4 78.1 95.5 0.804 methanol[5] 64.7 No azeotrope 1-propanol 97.3 87.7 71.7 0.866 2-propanol 82.5 80.4 87.7 0.818 n-butanol 117.8 92.4 55.5 U 79.9 L 7.7 U 0.849 L 0.990 sec-butanol 99.5 88.5 67.9 0.863 iso-butanol 108.0 90.0 70.0 U 85.0 L 8.7 U 0.839 L 0.988 tert-butanol 82.8 79.9 88.3 allyl alcohol 97.0 88.2 72.9 0.905 benzyl alcohol 205.2 99.9 9 furfuryl alcohol 169.4 98.5 20 cyclohexanol[6] 161.1 97.8 20 benzyl alcohol[6] 205.4 99.9 9 with various organic acids formic acid 100.8 107.3 77.5 acetic acid ^‡[5][7] 118.1 No azeotrope propionic acid 141.1 99.98 17.7 1.016 butyric acid 163.5 99.94 18.4 1.007 iso-butyric acid 154.5 99.3 21 with mineral acids nitric acid 83.0 120.5 68 1.405 perchloric acid 110.0 203 71.6 hydrofluoric acid 19.9 120 37 hydrochloric acid –84 110 20.24 1.102 hydrobromic acid –73 126 47.5 1.481 hydroiodic acid –34 127 57 sulfuric acid 290 338 98 with various alkyl halides ethylene chloride 83.7 72 91.8 propylene chloride 96.8 78 89.4 chloroform[8] 61.2 56.1 97.2 U 0.8 L 99.8 U 1.004 L 1.491 carbon tetrachloride 76.8 66.8 95.9 U 0.03 L 99.97 U 1.000 L 1.597 methylene chloride 40.0 38.8 99.6 U 2.0 99.9 U 1.009 L 1.328 with various esters ethyl acetate 77.1 70.4 91.9 U 96.7 L 8.7 U 0.907 L 0.999 methyl acetate 57.0 56.1 95.0 0.940 n-propyl acetate[6] 101.6 82.4 86 ethyl nitrate 87.7 74.4 78 with various other solvents acetone ^‡[5][7] 56.5 °C No azeotrope methyl ethyl ketone 79.6 73.5 89 0.834 pyridine 115.5 92.6 57 1.010 benzene 80.2 69.3 91.1 U 99.94 L 0.07 U 0.880 L 0.999 toluene 110.8 84.1 79.8 U 99.95 L 0.06 U 0.868 L 1.000 cyclohexane 80.7 69.8 91.5 U 99.99 L 0.01 U 0.780 L 1.00 diethyl ether 34.5 34.2 98.7 0.720 tetrahydrofuran[5] 66 64.2[9] 95 anisole 153.9 95.5 59.5 acetonitrile 82.0 76.5 83.7 0.818 chloral 97.75 95.0 93.0 hydrazine[10] 113.5 °C 120.3 °C 68.5 m-xylene[3][11] 139.0 92.0 64.2 ^‡ 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 allyl alcohol, b.p.=97.0 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav with various solvents methyl butyrate 102.7 93.8 45 n-propyl acetate 101.6 94.2 47 benzene 80.2 76.8 82.6 0.874 toluene 110.8 92.4 50 cyclohexane 80.8 74 80 carbon tetrachloride 76.8 72.3 88.5 1.450 ethylene chloride 83.7 79.9 82		Azeotropes of ethanol, b.p.=78.4 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav with various esters ethyl acetate 77.1 71.8 69.2 0.863 methyl acetate 57.0 56.9 97 ethyl nitrate 87.7 71.9 56 isopropyl acetate[6] 88.4 76.8 47 with various hydrocarbons benzene 80.2 68.2 67.6 0.848 cyclohexane[12] 80.7 64.9 69.5 toluene 110.8 76.7 32 0.815 n-pentane 36.2 34.3 95 n-hexane 68.9 58.7 79 0.687 n-heptane 98.5 70.9 51 0.729 n-octane 125.6 77.0 22 with various alkyl halides ethylene chloride 83.7 70.5 63 chloroform 61.1 59.4 93 1.403 carbon tetrachloride 76.8 65.1 84.2 1.377 allyl chloride 45.7 44 95 n-propyl chloride 46.7 45.0 93 isopropyl chloride 36.3 35.6 97.2 n-propyl bromide 71.0 62.8 79.5 isopropyl bromide 59.8 55.6 89.5 n-propyl iodide 102.4 75.4 56 isopropyl iodide 89.4 71.5 73 methyl iodide 42.6 41.2 96.8 methylene chloride 40.1 39.85 95.0 ethyl bromide 38.0 37.0 97.0 trichloroethylene 87 70.9 73.0 1.197 trichlorotrifluoroethane (CFC 113) 47.7 43.8 96.2 1.517 tetrachloroethylene 121.0 76.75 37.0 with various other solvents methyl ethyl ketone 79.6 74.8 60 0.802 acetonitrile 82.0 72.9 43.0 0.788 nitromethane 101.3 75.95 26.8 tetrahydrofuran[13] P = 100 kPa 65.6 65 3.3 thiophene[12] 84.1 70.0 55.0 carbon disulfide[6] 46.2 42.4 92
		Azeotropes of methanol, b.p.=64.7 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav with various esters methyl acetate 57.0 53.8 81.3 0.908 ethyl acetate 77.1 62.3 56 0.846 ethyl formate 54.1 51.0 84 with various hydrocarbons benzene 80.2 58.3 60.5 0.844 toluene 110.8 63.8 31 0.813 cyclohexane 80.8 45.2 62.8 U 97.0 L 39.0 n-pentane 36.2 30.8 91 n-hexane[14] 68.9 60 71.6 n-heptane 98.5 59.1 48.5 n-octane 125.8 63.0 72.0 with various alkyl halides methylene chloride 40.0 37.8 92.7 ethylene chloride 83.7 61.0 68 chloroform 61.1 53.5 87.4 1.342 carbon tetrachloride 76.8 55.7 79.4 1.322 ethyl bromide 38.4 35.0 95.5 n-propyl chloride 46.6 40.5 90.5 isopropyl chloride 36.4 33.4 94 n-propyl bromide 71.0 54.5 79 isopropyl bromide 59.8 48.6 85.0 isopropyl iodide 89.4 61.0 62 trichloroethylene[6] 87.2 60.2 64 tetrachloroethylene[13] 121.1 63.5 40.6 trichlorotrifluoroethane (CFC 113)[6] 47.7 39.9 94 with various other solvents nitromethane 101.2 64.6 9 acetone 56.5 55.7 87.9 0.796 acetonitrile 82.0 63.45 19.0 carbon disulfide 46.2 37.7 86.0 U 50.8 L 97.2 U 0.979 L 1.261 Isopropyl alcohol[6] 82.5 64.0 20 tetrahydrofuran[15] P = 984 mBar 65.6 60.7 69.0

Azeotropes of n-propanol, b.p.=97.2 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav with various solvents methyl butyrate 102.7 94.4 51 n-propyl formate 80.8 80.65 97 n-propyl acetate 101.6 94.7 49 0.833 benzene 80.2 77.1 83.1 toluene 110.8 92.4 47.5 0.836 n-hexane 68.9 65.7 96 carbon tetrachloride 76.8 73.1 88.5 1.437 ethylene chloride 83.7 80.7 81 n-propyl bromide 71.0 69.7 91 Azeotropes of acetic acid, b.p.=118.5 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav with various solvents benzene 80.2 80.05 98 0.882 cyclohexane[6] 80.8 79.7 98 toluene 110.8 105.0 72 0.905 m-xylene 139.0 115.4 27.5 0.908 mesitylene[16] 164.6 118 3.6 n-heptane 98.5 92.3 70 n-octane 125.8 109.0 50 isopropyl iodide 89.2 88.3 91 carbon tetrachloride 76.8 76.6 97 tetrachloroethylene 121.0 107.4 61.5 ethylene bromide 131.7 114.4 45 1,1-dibromoethane 109.5 103.7 75.0 methylene bromide 98.2 94.8 84.0 pyridine 115.3 139.7 65.0 1.024

Azeotropes of Isopropyl alcohol, b.p.=82.5 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav with various esters ethyl acetate 77.1 75.3 75 0.869 isopropyl acetate 91.0 81.3 40 0.822 with various hydrocarbons benzene 80.2 71.9 66.7 0.838 toluene ^‡[12] 110.8 80.6 42 cyclohexane 80.7 68.6 67.0 0.777 n-pentane 36.2 35.5 94 n-hexane 68.9 62.7 77 n-heptane 98.5 76.3 46 with various alkyl halides carbon tetrachloride 76.8 69.0 82 1.344 chloroform 61.1 60.8 95.8 ethylene chloride 83.7 74.7 56.5 ethyl iodide 83.7 67.1 85 n-propyl chloride 46.7 46.4 97.2 n-propyl bromide 71.0 66.8 79.5 isopropyl bromide 59.8 57.8 88 n-propyl iodide 102.4 79.8 58 isopropyl iodide 89.4 76.0 68 tetrachloroethylene[12] 121.1 81.7 19.0 with various other solvents methyl ethyl ketone 79.0 77.5 68 0.800 diisopropyl ether 69 66.2 85.9 nitromethane 101.0 79.3 70 ^‡ CRC and Lange's disagree on this azeotrope, but web source corroborates CRC

Azeotropes of formic acid, b.p.=100.8 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav with various hydrocarbons benzene 80.2 71.7 69 toluene 110.8 85.8 50 m-xylene 139.0 94.2 29.8 m-xylene[3][11] 139.0 92.8 28.2 o-xylene[3] 143.6 95.5 26 p-xylene[3] 138.4 ~95 30.0 n-pentane 36.2 34.2 90 n-hexane 68.9 60.6 72 n-heptane 98.5 78.2 56.5 n-octane 125.8 90.5 37 with various alkyl halides chloroform 61.2 59.2 85 carbon tetrachloride 76.8 66.7 81.5 methyl iodide 42.6 42.1 94 ethyl bromide 38.4 38.2 97 ethylene chloride 83.6 77.4 86 ethylene bromide 131.7 94.7 48.5 n-propyl chloride 46.7 45.6 92 isopropyl chloride 34.8 34.7 98.5 n-propyl bromide 71.0 64.7 73 isopropyl bromide 59.4 56.0 86 with various other solvents carbon disulfide 46.3 42.6 83 Azeotropes of benzene, b.p.=80.1 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav cyclohexane 80.74 77.8 45.0 0.834 ethyl nitrate 88.7 80.03 12.0 methyl ethyl ketone 79.6 78.4 37.5 0.853 nitromethane 101.0 79.15 14.0 acetonitrile 82.0 73.0 34.0 n-heptane[6] 98.5 80.0 1

Azeotropes of ethylene glycol, b.p.=197.4 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav with various solvents ethyl benzoate 212.6 186.1 53.5 diphenyl 254.9 192.0 36 mesitylene 164.6 156.0 87 naphthalene 218.1 183.9 49 toluene 110.8 110.2 93.5 m-xylene 139.0 135.6 85 o-xylene 144.4 139.6 84.0 ethylene bromide 131.7 129.8 96 nitrobenzene 210.9 185.9 41 chlorobenzene 132.0 130.1 5.6 benzyl chloride 179.3 167.0 70 benzyl alcohol 205.1 193.1 44 anisole 153.9 150.5 89.5 acetophenone 202.1 185.7 48 aniline 184.4 180.6 76 o-cresol 191.1 189.6 73 Azeotropes of glycerol, b.p.=291.0 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav diphenyl 254.9 243.8 45 naphthalene 218.1 215.2 90 Azeotropes of acetone, b.p.=56.5 °C 2nd Component b.p. of comp. (˚C) b.p. of mixture (˚C) % by weight spef. grav carbon disulfide 46.3 39.3 67.0 1.04 chloroform 61.2 64.7 80.0 1.268 cyclohexane 80.74 53.0 33.0 n-hexane 68.8 49.8 41 ethyl iodide 56.5 55.0 40.0 carbon tetrachloride[12] 76.8 56.2 11.9

Miscellaneous azeotrope pairs component 1 b.p. comp. 1 (˚C) component 2 b.p. comp. 2 (˚C)   b.p. azeo. (˚C) % wt comp. 1 % wt comp. 2 spec. grav. acetaldehyde 21.0 diethyl ether 34.6 20.5 76.0 24.0 0.762 n-butane[12] –0.5 –7.0 16.0 84.0 acetamide 222.0 benzaldehyde 179.5 178.6 6.5 93.5 nitrobenzene 210.9 202.0 24.0 76.0 o-xylene 144.1 142.6 11.0 89.0 acetonitrile 82.0 ethyl acetate 77.15 74.8 23.0 77.0 toluene[13] 110.6 81.1 76.0 24.0 acetylene –86.6 ethane –88.3 –94.5 40.7 59.3 aniline 184.4 o-cresol 191.5 191.3 8.0 92.0 carbon disulfide 46.2 diethyl ether 34.6 34.4 1.0 99.0 0.719 1,1-dichloroethane 57.2 46.0 94.0 6.0 methyl ethyl ketone 79.6 45.9 84.7 15.3 1.157 ethyl acetate[6] 77.1 46.1 97 3 methyl acetate[6] 57.0 40.2 73 27 chloroform 61.2 methyl ethyl ketone 79.6 79.9 17.0 83.0 0.877 n-hexane 68.7 60.0 72.0 28.0 1.101 carbon tetrachloride 76.8 methyl ethyl ketone 79.9 73.8 71.0 29.0 1.247 ethylene dichloride 84.0 75.3 78.0 22.0 1.500 ethyl acetate 77.1 74.8 57.0 43.0 1.202 cyclohexane 80.74 ethyl acetate 77.15 72.8 46.0 54.0 ethyl nitrate 88.7 74.5 64.0 36.0 diethyl ether 34.6 methyl formate 31.50 28.2 44.0 56.0 methylene chloride[5] 40 40.8 30 70 nitromethane 101.0 toluene 110.8 96.5 55.0 45.0 tetrahydrofuran[15] 65.6 chloroform 61.2 72.5 34.5 65.5 n-hexane 69 63.0 46.5 53.5 toluene 110.63 pyridine 115.3 110.2 78.0 22.0 propylene glycol[17] 188.2 aniline 184.4 179.5 43 57 o-xylene 144.4 135.8 10 90 toluene 110.6 110.5 1.5 98.5

Ternary azeotropes

Tables of various ternary azeotropes (that is azeotropes consisting of three components). Fraction percentages are given by weight.

Data source color code
CRC & Lange's	CRC only	Lange's only	other (see references)

Ternary azeotropes of water, b.p.=100 °C

2nd component b.p. 2nd comp. (˚C) 3rd component b.p. 3rd comp. (˚C)   b.p. azeo. (˚C) % wt 1st % wt 2nd % wt 3rd spec. grav ethanol 78.4 ethyl acetate 77.1   70.3 °C 7.8 9.0 83.2 0.901 cyclohexane 80.8 62.1 7 17 76 benzene 80.2 64.9 7.4 U 1.3 L 43.1 18.5 U 12.7 L 52.1 74.1 U 86.0 L 4.8 U 0.866 L 0.892 chloroform 61.2 55.5 3.5 U 80.8 L 0.5 4.0 U 18.2 L 3.7 92.5 U 1.0 L 95.8 U 0.976 L 1.441 carbon tetrachloride 86.8 61.8 4.3 9.7 86.0 3.4 U 44.5 L <0.1 10.3 U 48.5 L 5.2 86.3 U 7.0 L 94.8 U 0.935 L 1.519 ethylene chloride 83.7 66.7 5 17 78 acetonitrile 82.0 72.9 1.0 55.0 44.0 toluene 110.6 74.4 12.0 U 3.1 L 20.7 37.0 U 15.6 L 54.8 51.0 U 81.3 L 24.5 U 0.849 L 0.855 methyl ethyl ketone 79.6 73.2 11.0 14.0 75.0 0.832 n-hexane 69.0 56.0 3.0 U 0.5 L 19.0 12.0 U 3.0 L 75.0 85.0 U 96.5 L 6.0 U 0.672 L 0.833 n-heptane 98.4 68.8 6.1 U 0.2 L 15.0 33.0 U 5.0 L 75.9 60.9 U 94.8 L 9.1 U 0.686 L 0.801 carbon disulfide 46.2 41.3 1.6 5.0 93.4 n-propanol 97.2 cyclohexane 80.8 66.6 8.5 10.0 81.5 benzene 80.2 68.5 8.6 9.0 82.4 carbon tetrachloride 76.8 65.4 5 U 84.9 L 1.0 11 U 15.0 L 11.0 84 U 0.1 L 88.0 U 0.979 L 1.436 diethyl ketone 102.2 81.2 20 20 60 n-propyl acetate 101.6 82.2 21.0 19.5 59.5 Isopropyl alcohol 82.5 cyclohexane 80.8 64.3 7.5 18.5 74.0 66.1 7.5 21.5 71.0 benzene 80.2 °C 66.5 7.5 18.7 73.8 65.7 °C 8.2 U 2.3 L 85.1 19.8 U 20.2 L 14.4 72.0 U 77.5 L 0.5 U 0.855 L 0.966 methyl ethyl ketone 79.6 73.4 11.0 1.0 88.0 0.834 toluene 110.6 76.3 13.1 U 8.5 L 61.0 38.2 U 38.2 L 38.0 48.7 U 53.3 L 1.0 U 0.845 L 0.930 allyl alcohol 97.0 n-hexane 69.0 59.7 5 U 0.5 L 64.4 5 U 3.6 L 34.8 90 U 95.9 L 0.8 U 0.668 L 0.964 benzene 80.2 68.2 8.6 U 0.6 L 80.9 9.2 U 8.7 L 17.7 82.2 U 90.7 L 0.4 U 0.877 L 0.985 cyclohexane 80.8 66.2 8 11 81 carbon tetrachloride 76.8 65.2 5 U 71.7 L 0.8 11 U 25.6 L 10.1 84 U 2.7 L 89.1 U 0.777 L 1.464 benzene 80.1 acetonitrile 82.0 66.0 8.2 68.5 23.3 methyl ethyl ketone 79.6 68.2 8.8 U 0.6 L 94.7 65.1 U 71.3 L 0.1 26.1 U 28.1 L 5.2 U 0.858 L 0.992 methyl ethyl ketone 79.6 carbon tetrachloride 76.8 65.7 3.0 U 94.4 L 0.1 22.2 U 5.5 L 22.6 74.8 U 0.1 L 77.3 U 0.993 L 1.313 cyclohexane 81.0 63.6 5.0 U 0.6 L 89.9 60.0 U 37.0 L 10.0 35.0 U 62.4 L 0.1 U 0.769 L 0.98 chloroform 61.2 methanol 64.65 52.6 4.0 U 27.0 L 3.0 81.0 U 32.0 L 83.0 15.0 U 41.0 L 14.0 U 1.022 L 1.399 acetone^‡ 56.5 60.4 4.0 57.6 38.4

^‡Saddle azeotrope

Ternary azeotropes of methanol, b.p.=64.65 °C

2nd component b.p. 2nd comp. (˚C) 3rd component b.p. 3rd comp. (˚C)   b.p. azeo. (˚C) % wt 1st % wt 2nd % wt 3rd spec. grav acetone 56.5 chloroform^‡ 61.2   57.5 23.0 30.0 47.0 methyl acetate 57.0 53.7 17.4 5.8 76.8 0.898 cyclohexane 81.4 51.5 16.0 43.5 40.5 methyl acetate 57.1 carbon disulfide 46.2 37.0 cyclohexane 81.4 50.8 17.8 48.6 33.6 n-hexane 69.0 45.0 14.0 27.0 59.0 0.73

^‡Saddle azeotrope

References

1. Lange's Handbook of Chemistry, 10th ed. pp1496-1505
2. CRC Handbook of Chemistry and Physics, 44th ed. pp 2143-2184
3. Lee H. Horsley, ed. (1 June 1973). Azeotropic Data—III. Advances in Chemistry Series No. 166. 116. American Chemical Society. doi:10.1021/ba-1973-0116. ISBN 9780841201668.
4. "Azeotrope Databank".
5. "What is an Azeotrope?". B/R Corporation. Archived from the original on 24 April 2007. Retrieved 24 March 2007.
6. John Durkee (November 2000). "Binary Organic Azeotropes Useful for Solvent Cleaning" (PDF). metalfinishing.com. Retrieved 13 February 2011.
7. 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. Archived from the original (PDF) on 5 September 2004. Retrieved 24 March 2007.
8. Composition of Vapors from Boiling Binary Solutions J. J. Conti , D. F. Othmer , Roger Gilmont. J. Chem. Eng. Data, 1960, 5 (3), pp 301–307 doi:10.1021/je60007a019
9. https://www.hydrocarbonprocessing.com/magazine/2018/april-2018/special-focus-petrochemical-technology/modeling-and-optimization-of-pressure-distillation-to-achieve-pharma-grade-thf
10. Merck Index of Chemicals and Drugs, 9th ed. monograph 4653
11. Reinders, W.; de Minjer, C. H. (3 September 2010). "Vapour-liquid equilibria in ternary systems. V. The system water-formic acid-metaxylene". Recueil des Travaux Chimiques des Pays-Bas. 66 (9): 564–572. doi:10.1002/recl.19470660905.
12. Ponton, Jack (September 2001). "Azeotrope Databank". The Edinburgh Collection of Open Software for Simulation and Education, University of Edinburgh. Archived from the original (Queriable database) on 24 April 2007. Retrieved 24 March 2007.
13. "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center.
14. Rumble, John (2020). CRC Handbook of Chemistry and Physics (101 ed.). Taylor & Francis Group.
15. "Tetrahydrofuran (THF) Storage and Handling" (PDF). BASF. Retrieved 24 May 2007.
16. US US2530325, Carl S Carlson, "Azeotropic distillation of mesitylene from isophorone", published 1950-11-14, issued 1950-11-14
17. "1,2-Propanediol". ChemIndustry.ru. Archived from the original on 21 December 2007. Retrieved 28 December 2007.