This page provides supplementary chemical data on p-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 and follow its directions.

Structure and properties

Structure and properties
Index of refraction, nD1.4958 at 20 °C
Dielectric constant, εr2.2 ε0 at 20 °C
Surface tension29.92 dyn/cm at 5 °C 28.27 dyn/cm at 20 °C 24.2 dyn/cm at 60 °C
Viscosity0.7385 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
Solubility0.160 g/L at 0 °C 0.181 g/L at 25 °C 0.22 g/L at 40 °C

Thermodynamic properties

Phase behavior
Triple point286.3 K (13.15 °C), ? Pa
Critical point617 K (344 °C), 3500 kPa
Std enthalpy change of fusion, ΔfusHo17.1 kJ/mol
Std entropy change of fusion, ΔfusSo59.8 J/(mol·K)
Std enthalpy change of vaporization, ΔvapHo35.7 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, Soliquid247 J/(mol K)
Enthalpy of combustion, ΔcHo−4552 kJ/mol
Heat capacity, cp181.7 J/(mol K)
Gas properties
Std enthalpy change of formation, ΔfHogas1.796000E+04 kJ/kg-mol at 25 °C
Standard molar entropy, Sogas? J/(mol K)
Heat capacity, cp163.2 J/(mol K) at 120 °C
van der Waals' constantsa = 3134 L2 kPa/mol2 b = 0.1809 liter per mole

Vapor pressure of liquid

P in mm Hg11040100400760
T in °C−8.127.354.475.9115.9138.3

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

log10 of p-Xylene vapor pressure. Uses formula: log e ⁡ P m m H g = {\displaystyle \scriptstyle \log _{e}P_{mmHg}=}log e ⁡ ( 760 101.325 ) − 9.527348 log e ⁡ ( T + 273.15 ) − 7637.951 T + 273.15 + 79.55720 + 5.748969 × 10 − 6 ( T + 273.15 ) 2 {\displaystyle \scriptstyle \log _{e}({\frac {760}{101.325}})-9.527348\log _{e}(T+273.15)-{\frac {7637.951}{T+273.15}}+79.55720+5.748969\times 10^{-6}(T+273.15)^{2}} obtained from CHERIC

Distillation data

BP Temp. °C% by mole p-xylene
Vapor-liquid Equilibrium for p-Xylene/o-Xylene 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 94.4 100.0 100.0Vapor-liquid Equilibrium for p-Xylene/m-Xylene 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 94.40 100.0 100.0Vapor-liquid Equilibrium for p-Xylene/carbon tetrachloride 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 99.7Vapor-liquid Equilibrium for p-Xylene/Butanone 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 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
Vapor-liquid Equilibrium for p-Xylene/o-Xylene P = 26.66 kPa
liquidvapor
100.10.00.0
99.84.95.8
99.59.911.8
99.017.420.7
98.525.129.3
98.132.637.1
97.640.644.9
97.248.653.8
96.756.961.8
96.264.969.6
95.873.177.3
95.481.484.5
94.990.791.6
94.695.496.0
94.4100.0100.0
Vapor-liquid Equilibrium for p-Xylene/m-Xylene P = 26.66 kPa
BP Temp. °C% by mole p-xylene
liquidvapor
95.300.00.0
95.208.38.5
95.1515.515.8
95.0524.324.9
95.0033.033.6
94.9040.941.7
94.8549.049.7
94.7557.157.9
94.7065.366.1
94.6073.874.3
94.5581.782.2
94.5089.589.9
94.4594.894.8
94.40100.0100.0
Vapor-liquid Equilibrium for p-Xylene/carbon tetrachloride P = 760 mm Hg
BP Temp. °C% by mole carbon tetrachloride
liquidvapor
136.41.75.9
131.16.321.6
126.211.134.9
121.815.745.3
117.620.353.9
113.525.261.6
109.830.167.9
106.235.173.1
102.740.577.9
102.241.378.7
98.148.583.6
94.455.887.6
91.162.990.8
88.070.193.4
85.277.295.4
82.684.096.9
80.091.198.4
77.697.799.7
Vapor-liquid Equilibrium for p-Xylene/Butanone 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/Butanone P = 760 mm Hg
BP Temp. °C% by mole butanone
liquidvapor
129.454.820.8
125.427.931.7
123.2510.238.1
116.8016.151.1
112.4421.059.4
105.5530.571.0
101.1538.775.5
95.3050.685.2
93.9054.687.2
89.4567.091.7
86.5577.094.7
85.0281.595.9
84.5883.196.2
80.6597.0994
Vapor-liquid Equilibrium for p-Xylene/Aniline 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
Vapor-liquid Equilibrium for p-Xylene/Aniline P = 745 mm Hg
BP Temp. °C% by mole p-xylene
liquidvapor
1717.537.0
16514.050.0
15626.567.5
14848.580.0
14272.589.0
14083.092.0

Spectral data

UV-Vis
Spectrum
λmax? nm
Extinction coefficient, ε?
IR
Spectrum
Major absorption bands793.94 cm−1
NMR
Spectrum[permanent dead link]
Proton NMR2.296, 7.046
Carbon-13 NMR134.66, 128.97, 20.90
MS
Spectrum
Masses of main fragments106, 91, 77

Notes

Bibliography

  • . Archived from on 13 January 2004.
  • . Archived from on 5 May 2006.