xylene


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Related to xylene: O-Xylene

xylene

(zī`lēn) or

dimethylbenzene

(dī'mĕthəlbĕn`zēn), C6H4(CH3)2, colorless, oily, liquid aromatic hydrocarbonhydrocarbon
, any organic compound composed solely of the elements hydrogen and carbon. The hydrocarbons differ both in the total number of carbon and hydrogen atoms in their molecules and in the proportion of hydrogen to carbon.
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, used extensively as a solvent, obtained from coal tar, wood tar, and sometimes from petroleum. It is a mixture of three isomers that differ structurally from one another in the location of the two methyl groups that have replaced hydrogen atoms in the benzenebenzene
, colorless, flammable, toxic liquid with a pleasant aromatic odor. It boils at 80.1°C; and solidifies at 5.5°C;. Benzene is a hydrocarbon, with formula C6H6.
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 molecule. Ortho-xylene is 1,2-dimethylbenzene; it melts at −25°C; and boils at 144°C;. Meta-xylene is 1,3-dimethylbenzene; it melts at −48°C; and boils at 139°C;. Para-xylene is 1,4-dimethylbenzene; it melts at 13°C; and boils at 138°C;. The separation of these three isomers from one another by fractional distillation is difficult because their boiling points are so close together. The ortho and para isomers are converted to meta-xylene by treatment with aluminum trichloride and hydrochloric acid at about 80°C;. The xylenes are often used in the synthesis of other compounds, e.g., the xylidenes that are amino derivatives used in the synthesis of azo dyes and other compounds.

xylene

[′zī‚lēn]
(organic chemistry)
C6H4(CH3)2 Any one of the family of isomeric, colorless aromatic hydrocarbon liquids, produced by the destructive distillation of coal or by the catalytic reforming of petroleum naphthenic fractions; used for high-octane and aviation gasolines, solvents, chemical intermediates, and the manufacture of polyester resins. Also known as dimethylbenzene; xylol.

xylene

an aromatic hydrocarbon existing in three isomeric forms, all three being colourless flammable volatile liquids used as solvents and in the manufacture of synthetic resins, dyes, and insecticides; dimethylbenzene. Formula: C6H4(CH3)2
References in periodicals archive ?
The tensile dynamic mechanical properties of the polyamide/epoxy/20% xylene sample after two days of cure at ambient temperature and humidity are shown in Figure 2.
Severe vasodilatation, skin edema changes and infiltration of inflammatory cells are detected as signs of acute inflammation after topical application of xylene [21].
Chapter 3 offers a detailed analyses of the various applications for toluene, for example the production of benzene and xylene.
The xylene and zinc acetate, used in depolymerization reactions, were Merck synthesis or analytical grade.
JCI had been using a type of paint that had a lot of xylene in it, Elliott said.
After adjusting for age and sex, those who had worked with xylene or toluene and either acetone or chlorinated solvents had an almost nine times greater risk of severe RP.
In studies conducted on rats, xylene and formaldehyde caused testicular atrophy and decreases in testes weight and serum testosterone level, diameter of seminiferous tubules and seminiferous epithelial height (Chung et al.
In this study, the concentration of four VOCs namely benzene, toluene, ethylbenzene, xylene (BTEX) and ozone in a large printing facility located in Bangkok, Thailand.
Some other hazardous ingredients in traditional floor waxes are nitrobenzene, perchloroethylene, phenol, toluene and xylene.
A low VOC, chromate, xylene and toluene free engine coating system from Indestructible Paint Ltd.
or higher; a xylene soluble fraction at room temperature (about 25[degrees] C.
THE SYNTHETIC fragrance musk ketone has been correctly declared a carcinogen with the same potential dangers to consumers as musk xylene, a European Commission committee has concluded.