Sources of Pollution
Approximately 70% of mixed Xylene is used in the
production of Ethyl Benzene and the m-, o-, and p-isomers. The remaining mixed
Xylene is used as a solvent, in products such as paints and coatings, or blended into petrol. Xylene is
often used as a solvent and in the printing, rubber, and leather industries.
It is used as a cleaning agent for steel and for silicon wafers and chips.
It is used as a thinner for paint, and in paints and
varnishes. It may be substituted forToluene to thin lacquers where slower
drying is desired.
The Xylene isomers are used primarily for internal industrial operations as
solvents and intermediates in synthetic reactions.
m-Xylene is a chemical intermediate in the
production of isophthalic acid and isophthalonitrile; isophthalic acid, in
turn, is used in the manufacture of polyesters.
o-Xylene is a chemical intermediate in the
synthesis of phthalic anhydride (forplasticizers), phthalonitrile,
4,4-(trifluoro-1-(trifluoromethyl) ethylidene) diphthalic anhydride (for polyimide polymers), o-toluic
acid, vitamins, and pharmaceuticals.
p-Xylene is a chemical intermediate for the synthesis of dimethyl
terephthalate, terephthalic acid (for polyesters), dimethyl
tetrachloroterephthalate, vitamins, and pharmaceuticals. It is used for the manufacturer of plastic
bottles and polyester clothing. 98% of p-Xylene production,
and half of all xylene, is used for polymer production.
Both o-xylene and p-xylene are used as components
Technical - Xylene - C8H10
Belongs to BTEX a substance group
- Clear, colourless flammable liquid
- Sweet smelling
- Detectable in the air 20ppm
- CAS Number: 108-33-3
LTEL - 50ppm (220 mg/m³)
STEL - 130ppm (441mg/m³)
- Risk Phrases: R10, 20, 21, 22, 36, 37, 38
- Safety Phrases: S25
The term Xylene refers to a mixture of three aromatic hydrocarbon isomers (substances that are composed of the same elements in the same proportions but differ in properties because of differences in the arrangement of atoms). Xylene is a clear, colorless, sweet-smelling liquid that is very flammable. Xylene is an association of the substance group of Benzene, Toluene, Ethyl Benzene and (Xylene) (BTEX).
Xylene is also known as Dimethylbenzene, Methyltoluene, Xylol. It is a mixture of the three Xylene isomers -ortho (o-xylene), meta (m-xylene) and para (p-xylene), with possible trace amounts of Ethyl Benzene. It is also referred to as xylenes (mixed).
Xylene is used as a solvent to manufacture gasoline, as a raw material for the production of organic chemicals used to make polyester fibres and to make dyes and insecticides. Other uses are in sterilizing catgut and in microscopy. The main source of Xylenes has been from reforming petroleum fractions.
o-Xylene is used almost entirely as the feedstock forphthalic anhydride manufacture, and for the preparation of phthalonitrile which is converted to the copper phthalocyanine (a colour pigment). m-Xylene is used for the manufacture of isophthalic acid and to a lesser extent, isophthalonitrile, which is the starting material of the fungicide tetrachloroisophthalonitrile. p-Xylene, the most important commercial isomer, is primarily converted for use in fibres, films, or resins, including polyester fibres which are used for household fabrics, carpets and clothing. Synonyms for Xylene are Dimethylbenzene and Xylol. Synonyms for o-xylene are 1,2-dimethylbenzene and o-xylol. Synonyms for m-xylene are 1,3-dimethylbenzene and m-xylol. Synonyms for p-xylene are 1,4-dimethylbenzene and p-xylo.