P-Xylene (data page) explained

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
Abbe number	? Please omit if not applicable -->
Dielectric constant, εr	2.2 ε0 at 20 °C
Bond strength	? Specify which bond.
Bond length	? Specify which bond.
Bond angle	? Specify which angle, e.g. Cl-P-O.
Magnetic susceptibility	? -->
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, ΔfusH^o	17.1 kJ/mol
Std entropy change of fusion, ΔfusS^o	59.8 J/(mol·K)
Std enthalpy change of vaporization, ΔvapH^o	35.7 kJ/mol at 138 °C
Std entropy change of vaporization, ΔvapS^o	? J/(mol·K)
	Solid properties
Std enthalpy change of formation, ΔfH^osolid	? kJ/mol
Standard molar entropy, S^osolid	? J/(mol K)
Heat capacity, cp	? J/(mol K)
	Liquid properties
Std enthalpy change of formation, ΔfH^oliquid	−24.4 kJ/mol
Standard molar entropy, S^oliquid	247 J/(mol K)
Enthalpy of combustion, ΔcH^o	−4552 kJ/mol
Heat capacity, cp	181.7 J/(mol K)
	Gas properties
Std enthalpy change of formation, ΔfH^ogas	1.796000E+04 kJ/kg-mol^[4] at 25 °C
Standard molar entropy, S^ogas	? J/(mol K)
Heat capacity, cp	163.2 J/(mol K) at 120 °C
van der Waals' constants^[5]	a = 3134 L^2 kPa/mol^2 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 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 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 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 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

Spectral data

	UV-Vis
Spectrum
λmax	? nm
Extinction coefficient, ε	?
	IR
Spectrum	NIST
Major absorption bands	793.94 cm^−1
	NMR
Spectrum	AIST
	2.296, 7.046
	134.66, 128.97, 20.90
Other NMR data Insert special data e.g. ^19F chem. shifts, omit if not used	-->
	MS
Spectrum	NIST
Masses of main fragments	106, 91, 77

References

Notes

Bibliography

• NIST Standard Reference Database
• Web site: University of Akron, Chemistry Department, Chemical Database . 1 February 2007 . http://webarchive.loc.gov/all/20040113012011/http%3A//ull.chemistry.uakron.edu/erd/ . 13 January 2004 . dead.
• Web site: National Institute of Advanced Industrial Science and Technology . 1 February 2007 . https://web.archive.org/web/20060505120103/http://www.aist.go.jp/RIODB/SDBS/cgi-bin/cre_index.cgi . 5 May 2006 . dead.

Notes and References

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. Web site: Pure Component Properties. Queriable database . 26 May 2007 . Chemical Engineering Research Information Center.
5. Lange's Handbook of Chemistry 10th ed, pp 1522–1524
6. Web site: Binary Vapor-Liquid Equilibrium Data. Chemical Engineering Research Information Center. Queriable database. 26 May 2007.