Molecular formula :
nature : C6H4 (CH3) 2 three isomers : (1), o-xylene (o-xylene), 0.8969 density, temperature -25 ° C, the boiling point of 144 ° C, a refractive index. 5058. (2), m-xylene (m-xylene), the relative density .867 (17 / 4 ° C), -47.4 ° C melting point, boiling point, 139.3 ° C, 1.4973 refractive index. (3) the p-xylene (p-xylene) density of 0.861, 13.2 ° C melting point, boiling point, 138.5 ° C, index 1.49575. Generally three isomers and mixtures of ethylbenzene, said mixed xylene, m-xylene to more content. Industry also contain xylene and toluene ethylbenzene. A transparent colorless volatile liquid. There aromatic odor. Toxic! Do not dissolve in water, soluble in alcohol and ether. Could be separated by distillation for three xylene, processing for other products, may also used as solvent separation. Fractionation of coal tar from the oil part of catalytic reforming or by the light gasoline fractionation, or by toluene disproportionation and prepared.
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