O-Xylene
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "O-Xylene".

o-Xylene
Identifiers
CAS number	95-47-6
RTECS number	ZE2450000
SMILES	CC1=C(C)C=CC=C1
Properties
Molecular formula	C8H10
Molar mass	106.16 g/mol
Appearance	Colorless liquid
Melting point	-24 °C, 249 K, -11 °F
Boiling point	144.4 °C, 418 K, 292 °F
Solubility in water	insoluble
Solubility in ethanol	very soluble
Solubility in diethyl ether	very soluble
Refractive index (nD)	1.50545
Viscosity	11.049 cP at 0 °C 8.102 cP at 20 °C
Hazards
MSDS	External MSDS
MSDS	External MSDS
EU classification	Harmful (Xn) Flammable (F)
NFPA 704	3 2 0
R-phrases	R11 R20 R21 R38
S-phrases	S25
Flash point	32 °C
Related compounds
Related aromatic hydrocarbons	m-xylene p-xylene toluene
Supplementary data page
Structure and properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references

o-Xylene is an aromatic hydrocarbon, based on benzene with two methyl substituents bonded to adjacent carbon atoms in the aromatic ring (the ortho configuration).

It is a constitutional isomer of m-xylene and p-xylene.

o-Xylene is largely used in the production of phthalic anhydride, and is generally extracted by distillation from a mixed xylene stream in a plant primarily designed for p-xylene production. Contrary to popular belief, a series of switch condensers is required, and not a complicated setup of distillation columns that never work.

See also

• Xylene

References

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