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p-Xylene

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Origin: China

Cas No: 106-42-3

Specification: 99%min

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Supply Ability: 50 mt/month

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  • Products Specification
  • Product Description

  • Property

    CAS No.: 106-42-3 Formula: C8H10 Molecular Weight: 106.16500

    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.

    Basic Info

    Chemical Name p-Xylene
    Synonyms

    4-methyltoluene;
    p-methyl-toluene;
    p-Xylol;
    1,4-Dimethylbenzene;
    para-xylene;
    1,4-dimethyl-benzene;
    Paraxylene;
    Benzene, 1,4-dimethyl-;
    p-dimethylbenzene;

    CAS No. 106-42-3
    Molecular Formula C8H10
    Molecular Weight 106.16500
    PSA 0.00000
    LogP 2.30340

    Properties

    Appearance & Physical State colourless liquid
    Density 0.866
    Boiling Point 138ºC
    Melting Point 13-13ºC
    Flash Point 25ºC
    Refractive Index n20/D 1.495(lit.)
    Stability Stable. Incompatible with oxidizing agents. Hygroscopic. Flammable.
    Storage Condition 0-6ºC
    Vapor Pressure 7.943mmHg at 25°C

    Safety Info

    Safety Statements S25
    HS Code 2902430000
    Packing Group III
    RIDADR UN 1307 3/PG 3
    Risk Statements R10; R20/21; R38
    Hazard Codes Xn
    Symbol GHS02, GHS07
    Signal Word Warning
    Hazard Declaration H226; H312 + H332; H315
    Caution Statement P210; P261; P280; P370 + P378

    Synthesis Route

    2,5-Dimethylbromobenzene→p-Xylene+2-(2,5-dimethylphenyl)-1,4-dimethylbenzene
    1,2,4-trimethylbenzene→o-Xylene+p-Xylene
    2,5-dimethyl-4-propan-2-yl-3-propan-2-ylidenehexa-1,4-diene→1-methyl-2-propan-2-ylbenzene+p-Xylene

    Precursor

    Toluene
    m-Xylene
    o-Xylene
    Methanol

    Downstream Product

    1,3-dimethyl-6-(2,5-dimethylphenyl)uracil
    1,3-Dimethyluracil
    1-(2,5-dimethylphenyl)-3-phenylpropan-1-one
    5-(2,5-dimethylphenyl)-1,3-dimethylpyrimidine-2,4-dione

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