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, 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 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: obtained from CHERIC[4]

Distillation data

Vapor-liquid Equilibrium
for p-Xylene/o-Xylene
[6]
P = 26.66 kPa
BP
Temp.
°C
 % by mole p-xylene
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
[6]
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
[6]
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
[6]
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
[6]
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 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
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References

Notes
  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. 1 2 "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. Retrieved 26 May 2007.
  5. Lange's Handbook of Chemistry 10th ed, pp 1522–1524
  6. 1 2 3 4 5 "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. Retrieved 26 May 2007.
Bibliography
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