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Isopropyl alcohol (data page)

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Chemical 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 eChemPortal, 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 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, ΔfusH 		5.28 kJ/mol
Std entropy change
of fusion, ΔfusS 		28.6 J/(mol·K)
Std enthalpy change
of vaporization, ΔvapH 		44.0 kJ/mol
Std entropy change
of vaporization, ΔvapS 		124 J/(mol·K)
Solid properties
Std enthalpy change
of formation, ΔfHsolid 		? kJ/mol
Standard molar entropy,
Ssolid 		? J/(mol K)
Heat capacity, cp 0.212 J/(mol K) at −200°C
Liquid properties
Std enthalpy change
of formation, ΔfHliquid 		−318.2 kJ/mol
Standard molar entropy,
Sliquid 		180 J/(mol K)
Heat capacity, cp 2.68 J/(gK) at 20°C-25°C
Gas properties
Std enthalpy change
of formation, ΔfHgas 		−261.1 kJ/mol
Standard molar entropy,
Sgas 		333 J/(mol K)
Heat capacity, cp 1.54 J/(gK) at 25°C

Vapor pressure of Iso-propyl Alcohol

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.

Isopropanol vapor pressure (logarithmic scale) vs temperature. Drawn using data published in

Distillation data

Vapor-liquid equilibrium
for isopropanol/water
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
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 equilibrium
for isopropanol/acetone
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 m/mol
IR
Major absorption bands 3334, 2970, 1466, 1378, 1160, 1128, 951, 817, 639 cm
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)
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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 (2): 107–121. doi:10.1021/je60002a003.
  4. ^ "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. Retrieved 5 May 2007.

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