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The physical properties of the isomers of xylene differ slightly. The melting point ranges from −47.87 °C (−54.17 °F) (m-xylene) to 13.26 °C (55.87 °F) (p-xylene)—as usual, the para isomer's melting point is much higher because it packs more readily in the crystal structure. The boiling point for each isomer is around 140 °C (284 °F).
for m-Xylene/Toluene [7] P = 760 mm Hg BP Temp. °C % by mole toluene liquid vapor ... Except where noted otherwise, data relate to Standard temperature and pressure.
for p-Xylene/Aniline [6] P = 745 mm Hg BP Temp. °C % by mole p-xylene liquid vapor 171: 7.5: ... data relate to Standard temperature and pressure. Reliability of ...
The p-xylene is then separated out in a series of distillation, adsorption or crystallization and reaction processes from the m-xylene, o-xylene, and ethylbenzene. Its melting point is the highest among this series of isomers, but simple crystallization does not allow easy purification due to the formation of eutectic mixtures.
m-Xylene (meta-xylene) is an aromatic hydrocarbon. It is one of the three isomers of dimethylbenzene known collectively as xylenes . The m- stands for meta- , indicating that the two methyl groups in m -xylene occupy positions 1 and 3 on a benzene ring.
o-Xylene (ortho-xylene) is an aromatic hydrocarbon with the formula C 6 H 4 (CH 3) 2, with two methyl substituents bonded to adjacent carbon atoms of a benzene ring (the ortho configuration). It is a constitutional isomer of m -xylene and p -xylene , the mixture being called xylene or xylenes.
for o-Xylene/m-Xylene [8] P = 26.66 kPa BP Temp. °C % by mole m-xylene liquid vapor ... Except where noted otherwise, data relate to Standard temperature and pressure.
This Wikipedia page provides a comprehensive list of boiling and freezing points for various solvents.