What is the boiling point of p-xylene (CAS 106-42-3) in Celsius?

p xylene boiling point (CAS 106-42-3)

The boiling point of p-xylene is 137–138°C (in Celsius).
This relatively high boiling point makes p-xylene a stable, high-boiling aromatic solvent used widely in coatings, adhesives, and petrochemical production.

What Is p-Xylene (PX)?

Paraxylene (PX) is a vital organic chemical feedstock primarily used in the production of purified terephthalic acid (PTA), which is further processed into end products such as polyester fibers and plastic bottles.

p-xylene (PX) uses

Production of Terephthalic Acid (PTA)
Over 90% of global p-xylene is used to produce PTA, the core raw material for:

PET plastics

Polyester fibers

Packaging materials

Film, yarn, bottles

Production of Dimethyl Terephthalate (DMT)
Used as a raw material for engineering plastics and polyester resins.

High-Boiling Aromatic Solvent
For paints, inks, adhesives, coatings, and cleaning solvents.

Intermediate in Chemical Synthesis
Used in specialty chemicals and dyes.

P-Xylene Physical Properties 

• Appearance and State: Colorless transparent liquid with a faint aromatic odor (similar to benzene but milder).
• P-xylene boiling point and melting point: Low boiling point (approximately 138.4°C), highly volatile; Melting point is 13.2°C. This characteristic may cause it to solidify into white crystals in low-temperature environments (e.g., winter). Storage temperature must be monitored (typically above 15°C to prevent solidification).
• Solubility: Sparingly soluble in water (solubility only about 19 mg/L at 20°C), readily soluble in organic solvents such as ethanol, benzene, etc. It is a typical non-polar solvent.
• P-xylene density and volatility: Liquid density is lower than water (approximately 0.861 g/cm³ at 20°C). Vapor density is greater than air (relative density approximately 3.66, air = 1). After leakage, vapors readily accumulate near the ground or in low-lying areas, increasing the risk of fire or explosion.
• Stability: Relatively stable at room temperature with no corrosive properties, but must be kept away from strong oxidizing agents and ignition sources.

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