o-Xylene/ortho xylene (CAS 95-47-6) is an important aromatic hydrocarbon widely used in chemical manufacturing, solvent and intermediate production. Understanding its density and boiling point is crucial for safe handling, storage, and industrial applications. This article details the physical properties of o-xylene and their importance.
Synonyms:
- Ortho-Xylene
- 1,2-Dimethylbenzene
- 1,2-Xylene
- o-Methyltoluene
- o-Dimethylbenzene
Basic Properties of o-Xylene
Ortho-xylene is one of the three isomers of xylene, distinguished by the position of its two methyl groups on the benzene ring.
| Chemical Formula | C₈H₁₀ |
| Molecular Weight | 106.17 g/mol |
| Appearance | Colorless liquid |
| CAS Number | 95-47-6 |
What Is the Density of o-Xylene?
o-Xylene (1,2-dimethylbenzene) has a density of approximately 0.88 g/cm² at 20°C.
The density of o-xylene is an important parameter for its storage and transportation.
This means that its density is less than that of water, and therefore it floats on water. It can be used in liquid-liquid separation processes. In industrial systems, density helps determine pumping, mixing, and volume calculations.
What Is the Boiling Point of o-Xylene?
Orthoxylene boiling point: approximately 144°C (291°F)
CAS 95-47-6 The boiling point of o-xylene is relatively high compared to many solvents.
This means it offers thermal stability for high-temperature applications. Compared to lighter solvents, o-xylene solvents evaporate more slowly, making them ideal for use in coatings, resins, and chemical synthesis.
Its boiling point also allows for efficient separation from other xylene isomers during distillation.
o-Xylene (ortho-xylene) CAS 95-47-6 Supplier
Other physicochemical properties
| CAS Number | 95-47-6 |
| Molecular Formula | C₈H₁₀ |
| Molecular Weight | 106.17 g/mol |
| Appearance | Colorless liquid |
| Odor | Aromatic, sweet odor |
| Melting Point | -25°C |
| Flash Point | ~30°C |
| Autoignition Temperature | ~463°C |
| Vapor Pressure (at 25°C) | ~6–7 mmHg |
| Refractive Index (n20/D) | ~1.505 |
| Solubility in Water | Insoluble |
| Solubility in Organic Solvents | Miscible with most organic solvents |
| Viscosity (at 25°C) | ~0.8 mPa·s |
| Explosive Limits (in air) | 1.0% – 7.0% |
o-xylene uses in industry
1. Production of Phthalic Anhydride:
The primary use of o-xylene is in the production of phthalic anhydride, a precursor to many plasticizers, dyes, and resins. Phthalic anhydride is used in the production of paints and coatings.
2. Solvent:
Ortho xylene is used as a solvent in the production of paints, varnishes, adhesives, and coatings due to its ability to dissolve a wide range of materials, especially plastics and resins. It is also used in solvent-based formulations in the rubber and leather industries.
3. Plasticizer:
CAS 95-47-6 o-xylene is used in the production of plasticizers such as dioctyl phthalate (DOP). DOP is used in PVC (polyvinyl chloride) plastics to improve their flexibility and durability.
4. Production of Terephthalic Acid:
In some cases, it can be converted into terephthalic acid (TPA), a key component in the production of polyester fibers and plastic bottles.
conclusion
The density and boiling point of o-xylene/orthoxylene (CAS 95-47-6) are key physical properties affecting its industrial applications, safety, and handling.
- Density: Approximately 0.88 g/cm³
- Boiling point: Approximately 144°C
These properties make it a versatile and high-performance chemical widely used in manufacturing and as a solvent.
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