O-Xylene (data page)

This page provides supplementary chemical data on o-Xylene.

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. MSDS is available from MATHESON TRI-GAS, INC. in the SDSdata.org database.

Structure and properties

Structure and properties
Index of refraction,[1] nD 1.5058 at 20°C
Abbe number ?
Dielectric constant,[2] εr 2.568 ε0 at 20 °C
Bond strength ?
Bond length ?
Bond angle ?
Magnetic susceptibility ?
Surface tension[3] 30.10 dyn/cm at 20°C
Viscosity[4] 1.1049 mPa·s at 0°C
0.8102 mPa·s at 20°C
0.6270 mPa·s at 40°C
0.4168 mPa·s at 80°C
0.2626 mPa·s at 140°C
Solubility[5] 0.171 g/L at 25°C
0.21 g/L at 45°C

Thermodynamic properties

Phase behavior
Triple point 247.8 K (–25.3 °C), ? Pa
Critical point 631 K (358 °C), 3700 kPa
Std enthalpy change
of fusion, ΔfusHo		 13.6 kJ/mol
Std entropy change
of fusion, ΔfusSo		 54.87 J/(mol·K) at –25.3
Std enthalpy change
of vaporization, ΔvapHo		 36.24 kJ/mol at 144.5°C
Std entropy change
of vaporization, ΔvapSo		 ? 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)
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid		 –24.4 kJ/mol
Standard molar entropy,
Soliquid		 247 J/(mol K)
Enthalpy of combustion, ΔcHo –4552 kJ/mol
Heat capacity, cp 187.0 J/(mol K) at 25°C
Gas properties
Std enthalpy change
of formation, ΔfHogas		 19.0 kJ/mol
Standard molar entropy,
Sogas		 353.6 J/(mol K)
Heat capacity, cp 132.5 J/(mol K) at 25°C
van der Waals' constants[6] a = 3038 L2 kPa/mol2
b = 0.1755 liter per mole

Vapor pressure of liquid

P in mm Hg 1 10 40 100 400 760
T in °C –3.8 32.1 59.5 81.3 121.7 144.4

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

log10 of o-Xylene vapor pressure. Uses formula: \scriptstyle \log_e P_{mmHg} =\scriptstyle \log_e (\frac {760} {101.325}) - 10.06059\log_e(T+273.15) - \frac {7946.229} {T+273.15} + 83.32184 + 5.939742 \times 10^{-6} (T+273.15)^2 obtained from CHERIC[7]

Distillation data

See also:

Vapor-liquid Equilibrium
for o-Xylene/m-Xylene[8]
P = 26.66 kPa
BP
Temp.
°C		 % by mole m-xylene
liquid vapor
100.1 0.0 0.0
99.8 4.7 5.6
99.6 9.7 11.4
99.2 17.8 20.6
98.8 25.9 29.3
98.4 34.1 38.1
97.9 42.5 46.8
97.6 49.6 53.9
97.2 57.4 61.5
96.8 65.5 69.2
96.5 73.5 76.5
96.1 80.8 83.2
95.8 88.6 90.2
95.6 93.7 94.6
95.3 100.0 100.0
    
Vapor-liquid Equilibrium
for o-Xylene/Carbon tetrachloride[8]
P = 760 mm Hg
BP
Temp.
°C		 % by mole carbon tetrachloride
liquid vapor
142.0 1.8 6.5
136.0 6.4 22.9
130.4 11.2 36.9
125.0 16.1 49.4
120.7 20.4 57.3
116.1 25.3 64.6
111.8 30.2 70.9
107.9 35.2 75.9
104.2 40.4 80.3
104.1 40.5 80.5
99.4 47.8 85.2
95.1 55.4 88.9
91.6 62.4 91.6
88.2 70.0 94.0
85.3 77.1 95.8
82.6 84.1 97.2
80.0 91.0 98.5
77.7 97.6 99.6
    
Vapor-liquid Equilibrium
for o-Xylene/Ethanol[8]
P = 101.3 kPa
BP
Temp.
°C		 % by mole ethanol
liquid vapor
78.3 99.52 99.66
78.7 98.59 99.03
78.7 97.73 98.52
79.0 95.78 97.40
79.3 90.59 95.09
79.7 86.79 94.16
80.0 85.01 93.70
80.2 80.91 92.91
80.3 76.77 92.36
82.0 67.69 91.21
83.8 48.66 89.25
88.1 25.11 87.32
97.3 10.94 81.49
112.8 5.22 65.91
137.3 0.65 22.90
    
Vapor-liquid Equilibrium
for o-Xylene/Methanol[8]
P = 101.3 kPa
BP
Temp.
°C		 % by mole Methanol
liquid vapor
64.7 98.78 99.10
64.8 98.33 98.81
64.8 97.67 98.45
64.9 96.70 97.96
65.3 93.34 96.82
65.7 86.84 95.68
66.3 84.24 95.31
66.7 83.30 95.65
67.3 76.74 94.97
68.4 49.33 94.52
71.5 21.76 93.84
102.1 2.49 80.00

Spectral data

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

References

  1. ↑ Merck Index of Chemicals and Drugs, 9th ed. monograph 9743
  2. ↑ CRC Handbook of Chemistry and Physics, 44th ed. pp 2611-2620
  3. ↑ CRC Handbook of Chemistry and Physics, 44th ed. pp 2244-2248
  4. ↑ Lange's Handbook of Chemistry, 10th ed. pp 1669-1674
  5. ↑ CRC Handbook of Chemistry and Physics, 85th ed. p8-111
  6. ↑ Lange's Handbook of Chemistry, 10th ed, pp 1522-1524
  7. ↑ "Pure Component Properties" (Queriable Database). Chemical Engineering Research Information Center. Retrieved 27 May 2007.
  8. 1 2 3 4 "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. Retrieved 27 May 2007.

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

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