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. MATHESON TRI-GAS, INC.
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 tensionLange's Handbook of Chemistry, 10th ed, pp 1661–1663 29.92 dyn/cm at 5 °C28.27 dyn/cm at 20 °C24.2 dyn/cm at 60 °C ViscosityLange's Handbook of Chemistry, 10th ed, pp 1669–1674 0.7385 mPa·s at 10 °C0.6475 mPa·s at 20 °C0.5134 mPa·s at 40 °C0.3519 mPa·s at 80 °C0.2424 mPa·s at 130 °C SolubilityCRC Handbook of Chemistry and Physics, 85th ed. p8-111 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 changeof fusion, ΔfusHo 17.1 kJ/mol Std entropy changeof fusion, ΔfusSo 59.8 J/(mol·K) Std enthalpy changeof vaporization, ΔvapHo 35.7 kJ/mol at 138 °C Std entropy changeof vaporization, ΔvapSo ? J/(mol·K) Solid properties Std enthalpy changeof formation, ΔfHosolid ? kJ/mol Standard molar entropy,Sosolid ? J/(mol K) Heat capacity, cp ? J/(mol K) Liquid properties Std enthalpy changeof 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 changeof formation, ΔfHogas 1.796000E+04 kJ/kg-mol at 25 °C Standard molar entropy,Sogas ? J/(mol K) Heat capacity, cp 163.2 J/(mol K) at 120 °C van der Waals' constantsLange's Handbook of Chemistry 10th ed, pp 1522–1524 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.
Distillation data Vapor-liquid Equilibriumfor p-Xylene/o-XyleneP = 26.66 kPa BPTemp.°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 Equilibriumfor p-Xylene/m-XyleneP = 26.66 kPa BPTemp.°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 Equilibriumfor p-Xylene/carbon tetrachlorideP = 760 mm Hg BPTemp.°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 Equilibriumfor p-Xylene/ButanoneP = 760 mm Hg BPTemp.°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 Equilibriumfor p-Xylene/AnilineP = 745 mm Hg BPTemp.°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
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
Bibliography NIST Standard Reference Database