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This page provides supplementary chemical data on p-xylene.

Material Safety Data Sheet

Structure and properties

Structure and properties
Index of refraction, nD 1.4958 at 20°C
Dielectric constant, εr 2.2 ε0 at 20°C
Surface tension[1] 29.92 dyn/cm at 5°C
28.27 dyn/cm at 20°C
24.2 dyn/cm   at 60°C
Viscosity[2] 0.7385 mPa·s at 10°C
0.6475 mPa·s at 20°C
0.5134 mPa·s at 40°C
0.3519 mPa·s at 80°C
0.2424 mPa·s at 130°C
Solubility[3] 0.160 g/L at 0°C
0.181 g/L at 25°C
0.22 g/L at 40°C

Thermodynamic properties

Phase behavior
Triple point 286.3 K (13.15 °C), ? Pa
Critical point 617 K (344 °C), 3500 kPa
Std enthalpy change
of fusion, ΔfusHo 		17.1 kJ/mol
Std entropy change
of fusion, ΔfusSo 		59.8 J/(mol·K)
Std enthalpy change
of vaporization, ΔvapHo 		35.7 kJ/mol at 138°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 181.7 J/(mol K)
Gas properties
Std enthalpy change
of formation, ΔfHogas 		1.796000E+04 kJ/kg-mol[4] at 25°C
Standard molar entropy,
Sogas 		? J/(mol K)
Heat capacity, cp 163.2 J/(mol K) at 120°C
van der Waals' constants[5] a = 3134 L2 kPa/mol2
b = 0.1809 liter per mole

Vapor pressure of liquid

P in mm Hg 1 10 40 100 400 760
T in °C –8.1 27.3 54.4 75.9 115.9 138.3

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

log10 of p-Xylene vapor pressure. Uses formula: obtained from CHERIC[4]

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Distillation data

Vapor-liquid Equilibrium
for p-Xylene/o-Xylene[6]
P = 26.66 kPa
BP
Temp.
°C 		% by mole p-xylene
liquid vapor
100.1 0.0 0.0
99.8 4.9 5.8
99.5 9.9 11.8
99.0 17.4 20.7
98.5 25.1 29.3
98.1 32.6 37.1
97.6 40.6 44.9
97.2 48.6 53.8
96.7 56.9 61.8
96.2 64.9 69.6
95.8 73.1 77.3
95.4 81.4 84.5
94.9 90.7 91.6
94.6 95.4 96.0
94.4 100.0 100.0
   
Vapor-liquid Equilibrium
for p-Xylene/m-Xylene[6]
P = 26.66 kPa
BP
Temp.
°C 		% by mole p-xylene
liquid vapor
95.30 0.0 0.0
95.20 8.3 8.5
95.15 15.5 15.8
95.05 24.3 24.9
95.00 33.0 33.6
94.90 40.9 41.7
94.85 49.0 49.7
94.75 57.1 57.9
94.70 65.3 66.1
94.60 73.8 74.3
94.55 81.7 82.2
94.50 89.5 89.9
94.45 94.8 94.8
94.40 100.0 100.0
   
Vapor-liquid Equilibrium
for p-Xylene/carbon tetrachloride[6]
P = 760 mm Hg
BP
Temp.
°C 		% by mole carbon tetrachloride
liquid vapor
136.4 1.7 5.9
131.1 6.3 21.6
126.2 11.1 34.9
121.8 15.7 45.3
117.6 20.3 53.9
113.5 25.2 61.6
109.8 30.1 67.9
106.2 35.1 73.1
102.7 40.5 77.9
102.2 41.3 78.7
98.1 48.5 83.6
94.4 55.8 87.6
91.1 62.9 90.8
88.0 70.1 93.4
85.2 77.2 95.4
82.6 84.0 96.9
80.0 91.1 98.4
77.6 97.7 99.7
   
Vapor-liquid Equilibrium
for p-Xylene/Butanone[6]
P = 760 mm Hg
BP
Temp.
°C 		% by mole butanone
liquid vapor
129.45 4.8 20.8
125.42 7.9 31.7
123.25 10.2 38.1
116.80 16.1 51.1
112.44 21.0 59.4
105.55 30.5 71.0
101.15 38.7 75.5
95.30 50.6 85.2
93.90 54.6 87.2
89.45 67.0 91.7
86.55 77.0 94.7
85.02 81.5 95.9
84.58 83.1 96.2
80.65 97.0 994
 
Vapor-liquid Equilibrium
for p-Xylene/Aniline[6]
P = 745 mm Hg
BP
Temp.
°C 		% by mole p-xylene
liquid vapor
171 7.5 37.0
165 14.0 50.0
156 26.5 67.5
148 48.5 80.0
142 72.5 89.0
140 83.0 92.0

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Spectral data

UV-Vis
Spectrum
λmax ? nm
Extinction coefficient, ε ?
IR
Spectrum NIST
Major absorption bands 793.94 cm−1
NMR
Spectrum AIST
Proton NMR 2.296, 7.046
Carbon-13 NMR 134.66, 128.97, 20.90
MS
Spectrum NIST
Masses of
main fragments 		106, 91, 77

References

Notes

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Bibliography

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

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  1. ↑ Lange's Handbook of Chemistry, 10th ed, pp 1661-1663
  2. ↑ Lange's Handbook of Chemistry, 10th ed, pp 1669-1674
  3. ↑ CRC Handbook of Chemistry and Physics, 85th ed. p8-111
  4. ↑ 4.0 4.1 Template:Cite web
  5. ↑ Lange's Handbook of Chemistry 10th ed, pp 1522-1524
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Template:Cite web
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