Xylene (CAS 1330-20-7) is a common industrial chemical, a type of aromatic hydrocarbon. It's not a single compound but a mixture of three closely related isomers: ortho-xylene (o-xylene), meta-xylene (m-xylene), and para-xylene (p-xylene). All share the same chemical formula (C₈H₁₀) but have slightly different structures, which give them similar basic properties but distinct uses. It's naturally found in small amounts in crude oil and is produced in large quantities during petroleum refining.
What is the CAS number of mixed xylene?
The CAS number for mixed xylene-the blend of the three isomers-is 1330-20-7. This number uniquely identifies the mixture, while each individual isomer has its own CAS number: o-xylene (95-47-6), m-xylene (108-38-3), and p-xylene (106-42-3).
Physical Properties
Mixed xylene is a clear, colorless liquid with a sweet, gasoline-like odor. It's highly volatile, meaning it evaporates quickly at room temperature, and is flammable. It doesn't dissolve in water but mixes easily with organic solvents like ethanol, acetone, and oils. Its boiling point ranges from 138-144°C, depending on the ratio of isomers in the mixture.
Main Uses
- Solvent in Industry: It's widely used as a solvent in paints, coatings, and printing inks, where it dissolves resins and pigments to create smooth, easy-to-apply mixtures. It's also used in cleaning agents to remove grease and dirt from machinery.
- Fuel Additive: Small amounts are added to gasoline to improve its octane rating, helping engines run more smoothly and reducing knocking.
- Chemical Intermediate: The individual isomers separated from mixed xylene are used to make plastics (like PET from p-xylene), dyes, and synthetic fibers. The mixture itself is a starting point for isolating these valuable components.
Safety Notes
Xylene vapor can be harmful if inhaled in large amounts, causing dizziness or irritation to the eyes and lungs. It's important to use it in well-ventilated areas and store it away from heat sources due to its flammability. Proper handling ensures it remains a useful industrial chemical without risks to health or safety.
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