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Cyclohexane (data page)

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Cyclohexane (data page)

This page provides supplementary chemical data on cyclohexane.

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 and follow its directions.

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Structure and properties

Structure and properties
Index of refraction, nD 1.4262 at 20°C
Abbe number ?
Dielectric constant, εr 2.023 ε0 at 20 °C
Bond strength  ?
Bond length[1] 230 pm H–C
Bond angle 109.5° H–C–H
109.5°C–C–C
109.5° H–C–C
Magnetic susceptibility  ?
Surface tension 27 dyn/cm    at 10°C
25.3 dyn/cm at 20°C
15.7 dyn/cm at 80°C
Viscosity[2] 1.03 mPa·s at 17°C
0.93 mPa·s at 22°C
0.86 mPa·s at 27°C
0.75 mPa·s at 35°C

Thermodynamic properties

Phase behavior
Triple point 279.7 K (6.55 °C), ? Pa
Critical point 554 K (281 °C), 4070 kPa
Std enthalpy change
of fusion
, ΔfusHo
2.68 kJ/mol
crystal I → liquid
Std entropy change
of fusion
, ΔfusSo
9.57 J/(mol·K)
crystal I → liquid
Std enthalpy change
of vaporization
, ΔvapHo
32 kJ/mol
Std entropy change
of vaporization
, ΔvapSo
111.80 J/(mol·K)
Solid properties
Std enthalpy change
of formation
, ΔfHosolid
 ? kJ/mol
Standard molar entropy,
Sosolid
 ? J/(mol K)
Heat capacity, cp  ? J/(mol K)
Enthalpy of transition, ΔtrsHo 6.7 kJ/mol at –87.0°C
crystal II → crystal I
Entropy of transition, ΔtrsSo 36 J/(mol·K) at –87.0°C
crystal II → crystal I
Liquid properties
Std enthalpy change
of formation
, ΔfHoliquid
–156.4 kJ/mol
Standard molar entropy,
Soliquid
204 J/(mol K)
Enthalpy of combustion, ΔcHo –3919.6 kJ/mol
Heat capacity, cp 156 J/(mol K)
Gas properties
Std enthalpy change
of formation
, ΔfHogas
–123.1 kJ/mol
Standard molar entropy,
Sogas
298.19 J/(mol K)
Heat capacity, cp 105.3 J/(mol K)
van der Waals' constants[3] a = 2311 L2 kPa/mol2
b = 0.1424 liter per mole

Vapor pressure of liquid

P in mm Hg 1 10 40 100 400 760 1520 3800 7600 15200 30400 45600
T in °C –45.3(s) –15.9(s) 6.7 25.5 60.8 80.7 106.0 146.4 184.0 228.4  —  —

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed. The "(s)" annotation indicates equilibrium temperature of vapor over solid. Otherwise value is equilibrium temperature of vapor over liquid.

Distillation data

Vapor-liquid Equilibrium
for Cyclohexane/Ethanol
[5]
P = 760 mm Hg
BP
Temp.
°C
 % by mole ethanol
liquid vapor
73.99 2.0 17.5
69.08 3.0 30.2
66.94 6.5 35.8
66.08 8.1 36.3
66.37 8.6 36.5
65.59 12.5 38.8
65.23 15.1 39.6
65.12 20.6 40.8
64.93 25.8 41.5
64.87 28.3 41.8
64.84 31.5 42.6
64.78 36.6 43.0
64.77 40.3 43.1
64.77 43.1 43.1
64.78 44.4 43.8
64.81 50.0 44.3
64.88 55.7 45.5
65.01 61.3 46.0
64.99 62.1 45.8
65.25 67.8 47.5
65.56 73.8 50.5
66.03 76.3 49.6
65.93 77.6 51.5
66.40 78.1 49.8
66.90 80.9 54.5
67.26 83.3 57.8
67.98 85.3 59.5
68.86 88.1 62.3
69.44 89.8 65.3
70.11 90.9 67.8
71.42 92.9 72.5
72.48 95.1 77.8
   
Vapor-liquid Equilibrium
for Cyclohexane/Benzene
[5]
P = 760 mm Hg
BP
Temp.
°C
 % by mole benzene
liquid vapor
79.5 10.1 13.1
78.9 17.1 21.1
78.4 25.6 29.3
77.8 34.3 37.6
77.5 42.8 44.5
77.4 52.5 52.9
77.4 57.1 56.4
77.6 66.5 64.5
77.9 75.9 72.8
78.2 81.0 77.7
78.6 86.3 83.4
79.3 94.5 92.6
 
Vapor-liquid Equilibrium
for Cyclohexane/n-Hexane
[5]
P = 101.0 kPa
BP
Temp.
°C
 % by mole n-hexane
liquid vapor
80.60 0.00 0.00
78.87 7.9 12.12
78.15 12.50 18.30
77.36 18.06 25.19
76.85 21.65 29.30
76.29 25.92 34.13
75.85 29.39 37.92
75.29 33.52 42.38
75.29 37.86 46.93
74.23 41.63 50.71
73.58 46.72 55.63
73.11 50.66 59.21
72.26 59.26 67.28
71.11 69.43 76.07
70.45 76.18 81.40
69.05 90.70 93.13
68.64 100.00 100.00
   
Vapor-liquid Equilibrium
for Cyclohexane/Acetic acid
[5]
P = 101.325 kPa
BP
Temp.
°C
 % by mole acetic acid
liquid vapor
79.60 2.75 6.31
79.32 5.20 9.85
78.84 101.2 15.01
78.53 14.06 18.04
78.50 21.39 21.98
78.81 35.30 26.20
79.13 49.30 29.00
79.33 56.10 30.00
81.44 74.60 33.50
81.66 75.80 34.20
85.18 86.70 40.00
90.52 92.50 49.20
91.90 93.20 51.70
95.52 94.57 57.82
98.94 95.96 63.33
105.75 97.84 75.69
113.16 99.33 90.67
   
Vapor-liquid Equilibrium
for Cyclohexane/Isopropanol
[5]
P = 760 mm Hg
BP
Temp.
°C
 % by mole cyclohexane
liquid vapor
78.71 2.7 11.2
76.91 7.0 21.8
74.96 11.6 28.3
74.80 12.0 27.6
72.28 19.1 37.1
70.19 30.6 48.9
69.35 47.3 55.5
69.20 51.6 57.0
69.14 51.6 57.2
69.11 51.8 56.8
68.80 52.8 58.3
69.01 53.8 58.2
69.08 57.1 58.2
69.10 70.8 62.7
69.42 74.2 64.9
69.45 78.4 66.0
69.66 80.7 67.3
70.11 86.2 69.7
70.31 87.3 70.9
71.50 92.1 77.3
74.74 97.8 85.0
76.73 99.5 89.3

Spectral data

UV-Vis
λmax  ? nm
Extinction coefficient, ε  ?
IR
Major absorption bands 1055–1000 cm−1
NMR
Proton NMR  
Carbon-13 NMR  
Other NMR data  
MS
Masses of
main fragments
 

References

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

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