Mixed xylene is an aromatic organic compound composed of three main xylene isomers — ortho-xylene (o-xylene), meta-xylene (m-xylene), and para-xylene (p-xylene) — along with a significant proportion (approximately 10–20%) of ethylbenzene.
This chemical is primarily used as a solvent in various industries and, due to its moderate volatility and chemical stability, is one of the most widely used solvents in the petrochemical, paint and resin, printing, and adhesive industries.

Structure of Mixed Xylene

Mixed xylene consists of the following three isomers:

Ortho-xylene (o-xylene)
Meta-xylene (m-xylene)
Para-xylene (p-xylene)
together with about 10–20% ethylbenzene.

General Chemical Formula: C₈H₁₀
Structure: A benzene ring with two methyl (–CH₃) groups attached at different positions.

Properties of Mixed Xylene

Chemical Formula: C₆H₄(CH₃)₂
Appearance: Colorless, clear liquid with a sweet, characteristic odor
Boiling Point: Approximately 138–144°C
Flash Point: About 27–30°C (highly flammable)
Solubility: Insoluble in water but soluble in organic solvents such as ethanol, ether, and acetone

Applications of Mixed Xylene

Mixed xylene has a wide range of applications, including:

As a solvent in the manufacture of paints, varnishes, inks, and thinners
In adhesive and resin formulations
In the petrochemical industry for producing para-xylene, a raw material for polyesters and PET bottles
As an extraction agent in laboratories
In the production of plastics, synthetic fibers (such as polyester), detergents, and pesticides
As a cleaning and degreasing agent in the metal and electronics industries

Advantages of Mixed Xylene

High solvency power for a wide range of organic compounds
Readily available and cost-effective
Excellent compatibility with industrial and chemical processes
Good chemical stability in various industrial applications

Disadvantages of Mixed Xylene

Highly flammable: Must be stored in a safe environment away from heat sources
Toxic vapors: Prolonged inhalation can cause headaches, dizziness, drowsiness, central nervous system damage, and respiratory issues
Environmental hazards: Leakage can contaminate groundwater and soil
Skin and eye irritation: Direct contact may cause dryness, inflammation, and irritation

Safety and Handling of Mixed Xylene

When handling mixed xylene, the following safety precautions should be observed:

Wear chemical-resistant gloves, safety goggles, and an appropriate respirator
Store in tightly sealed, solvent-resistant containers
Keep away from heat, sparks, and open flames
Work in a well-ventilated area to prevent vapor accumulation
In case of a spill, absorb with non-combustible materials (such as clay or sand) and dispose of according to environmental regulations