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.
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 | 279.48 K (6.33 °C), 5.388 kPa[3] |
Critical point | 554 K (281 °C), 4070 kPa |
Std enthalpy change of fusion, ΔfusH |
2.68 kJ/mol crystal I → liquid |
Std entropy change of fusion, ΔfusS |
9.57 J/(mol·K) crystal I → liquid |
Std enthalpy change of vaporization, ΔvapH |
32 kJ/mol |
Std entropy change of vaporization, ΔvapS |
111.80 J/(mol·K) |
Solid properties | |
Std enthalpy change of formation, ΔfH |
? kJ/mol |
Standard molar entropy, S |
? J/(mol K) |
Heat capacity, cp | ? J/(mol K) |
Enthalpy of transition, ΔtrsH |
6.7 kJ/mol at –87.0 °C crystal II → crystal I |
Entropy of transition, ΔtrsS |
36 J/(mol·K) at –87.0 °C crystal II → crystal I |
Liquid properties | |
Std enthalpy change of formation, ΔfH |
–156.4 kJ/mol |
Standard molar entropy, S |
204 J/(mol K) |
Enthalpy of combustion, ΔcH |
–3919.6 kJ/mol |
Heat capacity, cp | 156 J/(mol K) or 1.85 J/(g K) |
Gas properties | |
Std enthalpy change of formation, ΔfH |
–123.1 kJ/mol |
Standard molar entropy, S |
298.19 J/(mol K) |
Heat capacity, cp | 105.3 J/(mol K) |
van der Waals' constants[4] | 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.
![](../I/LogCyclohexaneVaporPressure.png.webp)
Distillation data
Vapor-liquid Equilibrium for Cyclohexane/Benzene[6] 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[6] 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[6] 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/Ethanol[6] 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/Isopropanol[6] 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
- Morrison, Robert Thornton; Boyd, Robert Neilson: Organic Chemistry 2nd ed. p. 288
- Lange's Handbook of Chemistry, 10th ed. pp. 1669–1674
- Fink H.L.: The Heat Capacity and Entropy. Heats of Transition, Fusion and Vaporization and the Vapor Pressures of Cyclohexane. The Vibrational Frequencies of Alicyclic Ring Systems. J.Am.Chem.Soc. 65 (1943) 1135-1139
- Lange's Handbook of Chemistry 10th ed, pp. 1522–1524
- "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. Retrieved 19 May 2007.
- "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. Retrieved 19 May 2007.
- Linstrom, Peter (1997). "NIST Standard Reference Database". National Institute of Standards and Technology. doi:10.18434/T4D303.
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- Except where noted otherwise, data relate to Standard temperature and pressure.
- Reliability of data general note.
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