![]() 982,787,080 visitors served. |
|
![]() Dictionary/ thesaurus | ![]() Medical dictionary | ![]() Legal dictionary | ![]() Financial dictionary | ![]() Acronyms | ![]() Idioms | ![]() Encyclopedia | ![]() Wikipedia encyclopedia | ? |
xylene |
Also found in: Dictionary/thesaurus, Medical, Wikipedia | 0.02 sec. |
|
xylene (zī`lēn) or dimethylbenzene (dī'mĕthəlbĕn`zēn), C6H4(CH3)2, colorless, oily, liquid aromatic hydrocarbon hydrocarbon (hī'drōkär`bən), any organic compound composed solely of the elements hydrogen and carbon. ..... Click the link for more information. , 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 benzene benzene (bĕn`zēn, bĕnzēn`), colorless, flammable, toxic liquid with a pleasant aromatic odor. It boils at 80. ..... Click the link for more information. 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. |
|
? Mentioned in | ? References in periodicals archive | |
|---|---|---|
Briefly, stained microscopic preparations were washed in xylol and absolute ethanol, scraped with a sterile blade, and collected in a microcentrifuge tube in 1 x phosphate buffer. Spot measurements by the Chemical Section in Suva's Occupational Safety Department have also confirmed that the measured values of xylol, toluene, formaldehyde, ozone, and mineral fibers were well below the TWA according to the American Conference of Governmental Industrial Hygienists. |
| Free Tools: |
For surfers:
Browser extension |
Word of the Day |
Help
For webmasters: Free content NEW! | Linking | Lookup box | Double-click lookup | Partner with us |
|
|---|