M-Xylene

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m-Xylene
Other names

m-Xylol
1,3-Dimethylbenzene

Identifiers
CAS number 108-38-3 YesY
PubChem 7929
ChemSpider 7641 YesY
UNII O9XS864HTE N
KEGG C07208 N
ChEBI CHEBI:28488 N
ChEMBL CHEMBL286727 N
RTECS number ZE2275000
Jmol-3D images Image 1
Image 2
Properties
Molecular formula C8H10
Molar mass 106.16 g/mol
Appearance Colorless liquid
Density 0.86 g/mL
Melting point −48 °C; −54 °F; 225 K
Boiling point 139 °C; 282 °F; 412 K
Solubility in water insoluble
Solubility in ethanol very soluble
Solubility in diethyl ether very soluble
Refractive index (nD) 1.49722
Viscosity 0.8059 cP at 0 °C
0.6200 cP at 20 °C
Dipole moment 0.33-0.37 D[1]
Hazards
MSDS External MSDS
R-phrases R10 R20 R21 R38
S-phrases S25
Main hazards Harmful or fatal if swallowed. Vapor harmful. Flammable liquid and vapor.
NFPA 704
3
1
0
Flash point 25 °C
Related compounds
Related aromatic
hydrocarbons		 benzene
toluene
o-xylene
p-xylene
Supplementary data page
Structure and
properties 		n, εr, etc.
Thermodynamic
data 		Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
 N (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

m-Xylene (or meta-xylene) is an aromatic hydrocarbon, based on benzene with two methyl substituents. It is an isomer of o-xylene and p-xylene. The m stands for meta, meaning the two methyl substituents are at locants 1 and 3 on the aromatic ring. m-Xylene is commonly produced in BTX processes, and separated as needed from the other aromatic hydrocarbons.

The major chemical use of meta-xylene is in the manufacture of isophthalic acid, which is used as a copolymerizing monomer to alter the properties of polyethylene terephthalate (PET), making PET more suitable for the manufacture of soft drinks bottles. To convert m-xylene on an industrial scale to isophthalic acid, the two methyl groups are both catalytically oxidized to carboxyl groups. It is also used as a raw material in the manufacture of 2,4- and 2,6-xylidine as well as a range of smaller-volume chemicals.[2]

References

  1. ↑ DeanHandb, Lange´s Handbook of chemistry, 15th edition,1999.
  2. ↑ Ashford's Dictionary of Industrial Chemicals, third edition, page 9692.
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