m-Xylene

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m-Xylene
Skeletal formula Space-filling model
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
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g., gasoline) Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
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
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
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[edit]

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