p-Xylene

Catalog	ACM106423
CAS	106-42-3
Structure
Category	Environmental Standards
Description	p-Xylene is an aromatic hydrocarbon based on benzene with two methyl substituents with the chemical formula C8H10 or C6H4(CH3)2. The “p” stands for para, identifying the location of the methyl groups as across from one another. It is an isomer of xylene. Other isomers include o-xylene and m-xylene. The boiling point of p-xylene is 138.35 °C (281 °F) and the melting point is 13.2 °C (56 °F). p-Xylene is used on a large scale for the manufacture of terephthalic acid for polyester. Its polymer is known as parylene.p-Xylene is produced by catalytic reforming of petroleum naphtha as part of the BTX aromatics (benzene, toluene and the xylene isomers) extracted from the catalytic reformate. 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. It is also highly flammable.
Synonyms	1,4-Dimethylbenzene
Molecular Weight	106.16
Molecular Formula	C8H10
Melting Point	13-13ºC
Flash Point	25ºC
Density	0.866
Appearance	Colorless liquid
EC Number	203-396-5
Hazard Codes	Xn
HS Code	2902430000
LogP	2.30340
MDL Number	MFCD00008556
Refractive Index	n20/D 1.495(lit.)
RIDADR	UN 1307 3/PG 3
Risk Statements	R10; R20/21; R38
Safety Statements	S25
Stability	Stable. Incompatible with oxidizing agents. Hygroscopic. Flammable.
Storage Conditions	0-6ºC
Vapor Pressure	7.943mmHg at 25°C

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