Isopropyl alcohol (data page)

This page provides supplementary chemical data on isopropanol.

Material Safety Data Sheet

The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as MSDS Search Engine, and follow its directions.

Structure and properties

Structure and properties
Index of refraction, nD 1.3776 at 20°C
Abbe number ?
Dielectric constant, εr 18.23 ε0 at 25 °C
Bond strength ?
Bond length ?
Bond angle ?
Magnetic susceptibility ?
Surface tension 21.7 dyn/cm at 20°C
Viscosity[1] 4.5646 mPa·s at 0°C
2.3703 mPa·s at 20°C
1.3311 mPa·s at 40°C

Thermodynamic properties

Phase behavior
Triple point 184.9 K (–88.2 °C), ? Pa
Critical point 508.7 K (235.6 °C), 5370 kPa
Std enthalpy change
of fusion, ΔfusHo		 5.28 kJ/mol
Std entropy change
of fusion, ΔfusSo		 28.6 J/(mol·K)
Std enthalpy change
of vaporization, ΔvapHo		 44.0 kJ/mol
Std entropy change
of vaporization, ΔvapSo		 124 J/(mol·K)
Solid properties
Std enthalpy change
of formation, ΔfHosolid		 ? kJ/mol
Standard molar entropy,
Sosolid		 ? J/(mol K)
Heat capacity, cp 0.212 J/(mol K) at –200°C
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid		 –318.2 kJ/mol
Standard molar entropy,
Soliquid		 180 J/(mol K)
Heat capacity, cp 2.68 J/(gK) at 20°C-25°C
Gas properties
Std enthalpy change
of formation, ΔfHogas		 –261.1 kJ/mol
Standard molar entropy,
Sogas		 333 J/(mol K)
Heat capacity, cp 1.54 J/(gK) at 25°C

Vapor pressure of liquid

P in mm Hg 1 10 40 100 400 760 1520 3800 7600 15200 30400 45600
T in °C −26.1 2.4 23.8 39.5 67.8 82.5 101.3 130.2 155.7 186.0 220.2  —

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.

log10 of isopropanol vapor pressure vs temperature. Drawn using data published in [2][3]

Distillation data

Vapor-liquid equilibrium
for isopropanol/water[4]
P = 760 mm Hg
BP
temp.
°C		 % by mole isopropanol
liquid vapor
82.2 100.00 100.00
81.48 95.35 93.25
80.70 87.25 83.40
80.37 80.90 77.45
80.23 76.50 73.70
80.11 69.55 69.15
80.16 66.05 67.15
80.15 64.60 66.45
80.31 55.90 62.55
80.38 51.45 60.75
80.67 44.60 59.20
80.90 38.35 57.00
81.28 29.80 55.10
81.29 29.75 55.40
81.23 28.35 55.30
81.62 24.50 53.90
81.75 19.35 53.20
81.58 18.95 53.75
81.99 16.65 52.15
82.32 12.15 51.20
82.70 10.00 50.15
84.57 5.70 45.65
88.05 3.65 36.55
93.40 1.60 21.15
95.17 1.15 16.30
100.0 0.00 0.00
    
Vapor-liquid equilibrium
for isopropanol/methanol[4]
P = 101.325 kPa
BP
temp.
°C		 % by mole methanol
liquid vapor
64.37 100.0 100.0
67.34 81.26 90.32
67.64 79.45 89.10
69.54 68.64 81.73
70.77 61.72 76.52
71.88 55.96 71.76
72.78 51.03 67.78
73.80 46.34 63.08
74.85 39.75 56.21
75.65 35.50 51.62
76.36 31.71 46.91
77.93 23.79 35.98
78.67 19.49 30.22
79.45 15.45 24.40
80.04 12.30 19.56
80.57 9.30 14.66
80.82 8.43 12.43
82.20 0.0 0.0
    
Vapor-liquid rquilibrium
for isopropanol/acetone[4]
P = 101.325 kPa
BP
temp.
°C		 % by mole acetone
liquid vapor
77.92 6.12 19.90
76.71 8.28 25.52
71.50 19.59 47.03
70.99 20.91 48.90
69.20 26.01 55.29
68.85 27.10 56.50
65.91 37.55 66.12
63.55 48.12 73.37
63.42 48.74 73.75
62.46 53.77 76.63
62.37 54.27 76.91
61.85 57.22 78.49
61.86 57.12 78.43

See also

Spectral data

UV-Vis
λmax 205 nm
Extinction coefficient, ε 100.2 m2/mol
IR
Major absorption bands ? cm−1
NMR
Proton NMR  
Carbon-13 NMR  
Other NMR data  
MS
Masses of
main fragments		 m/z (% of relative intensity): 45 (100), 43 (19.1), 27 (16.8), 29 (12.5), 19 (9.9), 15 (9.5), 41 (8.2), 31 (6.8), 39 (6.6), 42 (4.4)

References

  1. ↑ Lange's Handbook of Chemistry, 10th ed. pp 1669-1674
  2. ↑ Parks, J. S.; B. Barton (1928). "Vapor pressure data for isopropyl alcohol and tertiary butyl alcohol". Journal of the American Chemical Society. 50: 24–26. doi:10.1021/ja01388a004.
  3. ↑ Barr-David, F; B. F. Dodge (1959). "Vapor-Liquid Equilibrium at High Pressures. The Systems Ethanol-Water and 2-Propanol-Water". Journal of Chemical and Engineering Data. 4: 107–121. doi:10.1021/je60002a003.
  4. 1 2 3 "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. Retrieved 2007-05-05.

Except where noted otherwise, data relate to standard ambient temperature and pressure.

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