O-Xylene

o-Xylene
Identifiers
CAS number	95-47-6 Y
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
EU classification	Harmful (Xn) Flammable (F)
R-phrases	R11 R20 R21 R38
S-phrases	S25
NFPA 704	3 2 0
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
Y (what is this?)  (verify) 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^{[citation needed]}.

See also

• Xylene

References

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